Can You Use a Mini Split in EXTREME COLD? Heat Pump vs. Propane Cost Comparison with Thermal Camera
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- เผยแพร่เมื่อ 1 ส.ค. 2024
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In this video I cover the following topics:
How does a heat pump work?
What is COP or coefficient of performance used for?
How a mini split unit is able to heat in the winter.
Cooper & Hunter Hyper Heat mini split system explained.
Is a LP furnace cheaper than a heat pump to operate?
How does a heat pump go through defrost?
Infrared thermal camera view of heat pump operation.
If you live in a more Northerly climate you may think that heating your space with a mini split heat pump system is out of the question but in this video I show how a Cooper & Hunter mini split system is able to heat all the way down to temperatures as low as -22 F!
There are some things to keep in mind though so I do my best to explain the different factors that you should be aware of so that you can make an informed decision for your installation.
Thanks for watching and subscribing! As an Amazon affiliate I earn from qualifying purchases. Thank you for your support! You can also tip me directly at www.paypal.me/bensahlstrom
0:00 - Mini Split In Extreme Cold Intro
0:54 - Mini Split Heat Pump Mode
1:36 - Thermal Camera-Indoor Unit
2:58 - Thermal Camera-Outdoor Unit
4:08 - How Cold It Is
5:10 - FLIR IR Thermal Camera
6:05 - Mini Split Efficiency COP
11:29 - What Mini Splits Do In Extreme Cold
12:38 - Defrost Mode
13:53 - Efficiency At Lowest Temperature
14:49 - In Summary
15:50 - Jorts?? SUBSCRIBE!!!
Blessings from Minnesota,
Ben
As an engineer and DIYer, you really speak my language!
The most comprehensive and accurate video on heat pumps. This should be available in all schools and universities as well.
Very timing and relevant video for me. I’m considering installing 2 mini splits in a northern MN cabin this summer. Thanks!
Good idea but maybe a wood stove for backup would be wise?
Even if a MiniSplit may be less efficient at lower temperatures, it has the much greater benefit that it can cool in the Summer, where other sources can't. Definitely worth the investment. Great video.
True, a propane or electric heater are just a waste of space in the summer.
@@SkaBob in very cold climates, where it regularly gets below zero every night in January and February, supplemental heat sources such as a traditional furnace, boiler, or even wood burning stoves can make up for that.
In Australia we are mostly to hot or to cold so these units are everywhere. In cooling cycle in ideal conditions a cop of 5 is possible. However cooling really struggles if we get 40 to 50 degrees Celsius under a tree. Radiant heat from the ground gets much hotter been known to melt the tar roads near Cairns.
SgtSchulz - I think the dual function of heat pumps are their best feature.
Great video! I'll be moving to an extremely cold weather environment soon, and this video answered quite a few questions I didn't even know I had! Thank you!
Just moved to an area with winter extremes down to -20F. I like the automatic nature of the heat pump. My concern is what this video brings out, the efficiency flop around 0F. My place has a propane monitor currently. But I am debating getting a wood pellet stove to solve the heat problem for good. Little more work involved with pellets but inexpensive. Not sure if I'll end up with heat pump but love the idea.
Dude super helpful information for a new homeowner like myself living in Canada. Thanks a million, saving this information preciously!
Excellent video. I'm planning on installing mini splits in my house next year. I only have electric heat so at the moment I'm learning.
Thank you!
Long time Benjame we truly missed you sir. Thank you for coming back 🤝
It's only been a week or two right? Haha! I need to get videos out more frequently that's for sure!
Great video! Very good explanations and the thermal camera portion said it all.
I'm most impressed that you can get propane for $1.60/gallon. It's more like $3/gallon where I live.
Great analysis of the mini split system using real life examples. This is one of the few videos I’ve watched to the end.
Good video, thank you for the content! I have an older heat pump i'm looking to replace, been considering the newer Mr. Cool Universal that can operate at pretty cold ambient temps. Got real tired of the old heat pump being turned off and running in 'backup heat mode' (aka toaster mode with resistance heat) during that stretch of near zero degree temps. I have my compressor cutoff around 15 degrees currently, seeing the Mr. Cool Universal able to stay fairly efficient in sub-zero temps but curious about real world experiences.
We used our mini split down well below zero for years and it was pretty darn cheap. Just removed it last summer and will reinstall it on a concrete pad. We had it wall mounted and that is very noisy! Real good information on this channel, keep up the good work!
Yea, mine vibrates too. I had to put some rubber grommets on the wall to quiet the unit down! Next time I’ll ground mount too
@@Dogatemyhomework927 I put mine on absorbing vibration springs they work much better
@@andreycham4797 I think that’s the answer!
@@Dogatemyhomework927 make sure you buy springs designed for different weights in order to install a unit more straight, compressor side is heavier
@@andreycham4797 great advice about the springs. I wonder if the manufacturer gives you the information on the type of springs.
Thank you for this video and especially for showing your calculations. This will be a great way to heat and cool my detached garage/workshop without needing to run a gas line as well as electric.
nice name
COP curves against ambient temperature would be enormously helpful.
What’s that?
I have a hyper Fujitsu minisplit that works minus 15 degrees. I also have cheap models that work only up to 20 degrees. One thing I’ve noticed, minisplits are good for suppliment heat. As a primary heat source, not too much. The size of the unit, size of the room and a multi zone does have an impact on its efficiency.
That's like saying you'll be hungry if you eat less.
I dont understand a bit of this .... except , that I love what it does !! Amazing. Thanks.
Great video. Both practical and scientific. Very cool FLIR. Show this to your kids. It might inspire future scientists/engineers.
I did a self install on a 18k btu mini split two years ago and have been very happy with the unit and it's cost to operate. My heating costs are dramatically lower than previous years when I relied solely on my oil fired boiler which works well and is fairly efficient. Boiler efficiency aside, I wanted AC for the house which is why I chose the mini split...the added benefit of heating from the same unit was icing on the cake. I tend to not run the mini split below 20 degrees F since I feel like the unit starts to work too hard making heat and the manufacturer states it's only efficient at heat production to about 15 F.
What type of Mini Split did you install?
Thanks for crunching the numbers. Very helpful an and very well done.
Thanks Benjamin! Very helpful, especially with the fuel cost comparison! I'm in MN too.
I have 2 Mitsubishi heads in 400 sq ft cabin, 2 rooms.. power is about $75/mo at 20-30 degrees n winter and I’m here half the day and all night. 78 in the daytime, 61 at night. Love em. That’s for hot water and other electrical appliances too
hi im in NY we pay upwards of 85 cents per KW. do you how many KW you use monthly in the winter?
What size units?
@@user-ln7of9gs4s I’d have to look, but they’re smaller..it’s a small house 500 square ft.. I oversized them so they don’t have to work too hard
@@Dogatemyhomework927 the smaller the btu the higher the seer rating. I know they have cheaper mr cool, but I was skeptical about getting parts. Mitsubishis are pricey and seem to be common, but they do have a good seer rating.
@@user-ln7of9gs4s this system cost me 3K and I was the HVAC man’s helper.. probably saved 500 bucks
This is exactly the video I was looking for. I’m in Minnesota and looking to size a mini split for a very small passive house.
It’s amazing how good Mini splits have gotten. Midea/Carrier has a 40seer 15eer 14.5hspf at 5f its hitting 2cop. I installed a .75ton one in the basement and have tested it at -6f with 130discharge temp and set blower on furnace in off and can maintain a 2300sf closed cell home bit excessive for the central KY environment. This home is perfect world example being a cape cod on basement.
130f discharge temp is very good. That's almost as high as a gas furnace, especially if you consider loss in a ducted system.
@@stevenle1760 It's honestly too high of a discharge temperature. Higher discharge temperatures mean higher compressor head pressures, higher power consumption, and lower efficiency. They are sacrificing COP so that people get to feel a warm breeze.
Terrible cop for a so called super high efficiency unit. What a scam rating.
My 24k 20 seer 10.5 hspf beats that lol
Great video and really helpful. I will be using a mini split for my shop (16x24 insulated garage). We are on propane which I knew would be much more expensive to run vs the mini
Exactly. It is great to have the backup option of propane available though. I am going to install a vent free LP heater in the coming days for that purpose.
Great info. You made me chuckle when you said "mild cold".
Only up north will someone say "mild cold" when it is 20°F outside.
I guess that wouldn't be considered "mild" in some places! These next few days look like they are going to be really nasty. Sunday's high is forecasted to be -7°f!
@@BenjaminSahlstrom, yikes. Im in central MI.
-10F outside today and me and my kids still were playing outside. It's all what you get used to i guess
@@BenjaminSahlstrom , definitely not jorts weather!
@@BenjaminSahlstrom
Are you happy with the Cooper&Hunter unit so far?
I’m looking to put one in here by Aberdeen soon. Dual head 12k/9k.
Thanks for any feedback you can give me!
I currently heat and cool with two Senville 12k BTU 26 SEER units. They perform amazingly without heat strips when it's well below 0° F. with blowing snow. I installed the units myself and really like them!
Great job ! Best explanation I have ever seen !
Very clear explanation of the ability of a heat pumps operation at low temps.
In my case I have a steam boiler that handles the really low temps, but for much of t he winter the heat pump carries the load.
Finally someone talking about heat pumps in MN climates. Thanks for the video!
We have an LG Inverter V which has provided heat down to -29 C. It held a temp of +20C set at +21C. Very happy with unit. Unit is now 7 years old.
Very smart, I've learned a lot. Heating cost is much more than cooling here in Long Island, NY. I have a cottage I'm planning on putting it in.
Excellent video, well thought out and presented!
One of the best videos ive ever seen thank you!
Knowing how the gas works when cycled makes all the difference in understanding why it can pull heat out of cold air or as they call heat exchange but it happens within the molecules in the gas vibrating and creating friction thus warming the condenser. Switching back and forth is very cool. I know car ac and understand house ac. But then being able to Essentially reverse the system is so cool!
Excellent information! Thank you. Checking out the J-orts now. :-)
Interesting information. My Napoleon mini split was not at all effective in warming my small space at -20F . My gas fireplace unfortunately stopped working and I had to wait a month for the part. Had to resort to space heaters for a month to keep from freezing. I am quite disappointed as I added this unit as a back up heat source which failed miserably when I needed it most. It does a good job of cooling in the summer.
Can't say more. Very clear👍👍👍
I agree with all of the comments, you do a great job explaining the COP, I would really like to see you analyze a air to water heat pump for several climate zones like a Noraire with a single heat pump central system, or an Apollo or Spacepak Monoblock type system.
Very interesting series. Looking forward to the rest of the how-to part of it...........
Great job! Earned a subscription. Will refer others to this!
Thank You Ben !!! Great Info !!
Here is W TX inverter heat pumps work well, especially if you oversize. Problems with oversize don't exist here in summer as our humidity is nil. We can upsize by 50% without issue and have heat down to the lowest it gets to be here in winter. These work great.
Very informative video !! Thanks !!
Awesome video, helps me make an informed decision. I am thinking about installing a Mini-Split system. I have a situation in my house where back in the 50's there was a system installed by Coleman in which they ran a 3" takeoff to each room, the living room received 2 since it was a little larger. The furnace I have now (25+ Years Old) the unit shuts off on high temperature because the furnace can not expel the heat within the unit through the 3" lines. My furnace technician told me that this will be an issue with a new furnace and will only let this happen 3 times before it shuts the furnace off and requires a technician to come and investigate, a safety feature. My dilemma is now installing basically all new larger duct work throughout the 2 story house or look at other options like a mini-split. It's a smaller house, 1250 Sq. Ft. so I have no real internal walls to run duct work up to the second floor and tearing out walls and ceilings to make this all happen is going to run the replacement bill through the roof. Even if the Mini-Split is more expensive than a normal furnace replacement I still think it's going to be the way to go when the time come's, it's going to be much cheaper and less intrusive than trying to replace duct work and I will probably be able to do it all mostly myself, or at least a big chunk of it. Thoughts?
The alternative is to get a boiler, instead of a furnace, and run 3/4 inch hot water pipes for baseboard heating. The new side-venting boilers are very efficient.
Very informative!
Another very handy video, thanks.
Phenomenal information young man. Thank you for all this information.
I'm looking at these in the UK and was back converting the temperatures to °C and our average Winter low is 37°F, even in 2010 when we had a really cold Winter it went down to -16°C (3.2°F). England's record lowest recorded temperature was in January 1982 when we hit -27.2°C (-17°F).
Great video buddy. Super cool heat camera shots too
Mini splits are pretty awesome! Watched your video about the Bluetti and completely agree about how confusing the 240v plugs are. The marketing for those systems needs to be more clear about all that is required for getting that 240v output. Will be awesome when and if a standalone 240v unit becomes available.
@@BenjaminSahlstrom right?! I got so excited and was so confused when the ev charger flashed red haha. Can't wait for a stand alone 240V. They totally could do it too. It's like a mpp lv6048 but in a box. And that unit isn't that heavy, and has split phase 6000W output and everything else. Hope they come out with something soon.
Been watching every heat pump video you've made!! Good stuff.
@@WillProwse Exactly. I'm working on another mini split heat pump video so that should be out eventually... haha
Shoot me a text and then we can call and talk heat pumps and solar for fun sometime. I have a public number/contact form on www.benjaminsahlstrom.com and we can go from there if you want!
@@WillProwse (507) 298-2367 not sure if it'll allow me to post my number or not but there it is
Great job, Ben! We built a net zero passive solar home in East Central MN 5 years ago and use mini-splits mostly for cooling but for a little bit of heating. Ours are Mitsubishi and are rated for -19º F. I usually run them a bit in the winter to exercise the heat function. Yes, they do work! I turned one of our two units on today after watching your video. Ambient outdoor temp is currently -5º F, and the units are outputting air at about 100º F. They are pulling about 1000 watts when running. It truly is amazing technology! I really enjoyed your infrared camera shots!! Cheers!
Wow that's great! Do you have a grid tied solar setup or are you totally off-grid? Would be interesting to see your net zero setup sometime!
@@BenjaminSahlstrom We are grid tied. We have enough excess capacity to power an electric car. But until then, we just take the cash the utility pays us for our excess electricity!
Love the name.
Thinking about getting one of these. It is great that it can go down so low. I live in Michigan, it can actually get down to -10 or -20 below zero at times.
It can work that low but it’s efficiency drops drastically in those low temperatures.
Awesome video thank you!
Great video. I'm looking at 2x9000 BTU Senville HF units.
Very good video, thank you for posting.
My 3 ton R22 HP starts to loose below 30F about 1.5 ton, but I'm in Florida where it almost never goes under 40F, and when 60F outside it's doing 36k btu+. Good tech explanation.
Typically I set traditional heat pumps to switch over to gas somewhere between 20-30 degrees. Below that temperature it isn't worth wearing out the heat pump/AC unit in my opinion.
I'm a auto HVAC guy have used mini splits, love them,I think if we line the rear grate with a heat rope for pipes the mini split would pull heat off of that to increase efficiency and less defrost cycles with better heating.
awesome detailed vid -- thanks!!!
Thanks for putting some no nonsense facts out there. I didn't realize that they could work to that cold of a temperature. I thought that anything at 32 degrees and lower you needed a back up heat. On the point of seeing the studs from the outside. You need a thermal break in there, a newer process I would highly recommend is the use of ZIP boards. They are sheathing with a layer of foam insulation applied to the inside. It increases the efficiency of your structure.
You need to look carefully at the specs. There are some affordable Pioneer units (19 SEER2/24k Btu) around $1200 that will operate down to -13F. Some other units are rated down to +20F. For more extreme temperatures you may find a 100% or higher price premium.
I come from the AC repair in automotive and I was curious on how this system can work as a heater. This is the only video I could find that mentions the evaporator working as a condenser and vise versa. Got it. Good video. Thanks!
just look at it backward your condenser becomes your evaperetor and condenser becomes evap!
I have a Fujitsu minisplit (rated to -15F) and I live a multiunit building in Fargo, ND. Above 30F, it's all I need usually. From 0F to 30F, it's worth running with supplemental heat from electric baseboard. Below 0F, it still puts out heat, but I feel like it doesn't put out very much heat. When it's below 0, I usually shut off all the indoor units except for one, because it's really only generating enough heat for one room. And it works great as an air conditioner.
Great video. Best one I have seen. Been looking at moving to northern ID. Will build an ICF house. The prevalent push from what I have read is radiant hydronic floor heating coupled to a boiler. Once I got away from the marketing, I started finding folks that are heating 3600SF tight homes with two minis. They have backup systems with a different heat source for redundancy and diversity. Thank you for the COP.
If I ever make is back to Montana, I’m doing air source heat pumps with propane. I think they call them dual fuel systems.
Thanks for the video. My generation had to deal with "early" models in the 70's & 80's. They were terrible and made me really wary to get back into type of HVAC system.
Great job! Thank you
Great explanation on mini split
Very smart video. Full of concise facts. Very helpful for costing out energy sources
Thank you for the breakdown.
This is going to be my first winter with MR COOL here in Minnesota. Anyone who lives here knows the crasy temps that gets.
Very nice explanation and visual!
Thanks!
Good info...thanks!
Last April, I installed a Senville LETO (18K BTU/19 SEER/3.1 COP). I live in upstate New York. So far I am very impressed with how well the unit works for both heating and cooling. Actually, I have used it more for heating than cooling. I have a small propane fireplace, but it sits idle (I haven't even lit the pilot light this year!) Today it never got above 20 and the mini-split heated my small home easily. During the colder evening hours, I wake up my wood boiler to heat the floor (yes, I love my heated floors!)
I would appreciate a discussion (theory of operation) on the defrost cycle. My mini-split has 3 sensors. I am interested in how the controls uses these temperature inputs to decide when a defrost is required. I have watched the unit's entire defrost cycle...usually takes between 8-10 minutes before it goes back into heat mode. Neat watching the frosted coil thaw out! It took time to get use to the unit switching from defrost back into heat mode (WHOOOOOSH!) Regards, JT
Time spent in heat mode, but the key indicator is temperature of the outdoor coil. I haven't looked at all the sensors yet in my Senville unit. But if you are in NY you should have gotten the Aura series unit instead.
@@sprockkets Actually, I am very pleased on how the unit I have has performed. Coming up on the one-year anniversary since startup.
I really wanted a Mitsubishi, but ALL of the Dealers here are arrogant, self-righteous, disrespectful, and rude!
@@Kntryhart No one here wanted to install one either. But I think it is because they know once they tell you the price it is a hard no. Like, probably at least $3000 a zone.
Got the 25 seer unit in ottawa.... amazing machines!
Those work great for places like Seattle, we spend most of the winter with rain around 38-42 degrees. Maybe 1 week or less with snow on the ground and even then it's in the 20s.
Excellent Video!!! Thank you!
Excellent explanations
I love this video. Please next time include conversion to celcius. You will gain lots of subscribers from the rest of the world by doing this.
Thank you for the hard work you put into your videos. You really helped me have a better understanding of how they work. I'm in the process of deciding if I should replace my old central AC or install mini splits. Would you recommend a 3 zone CH unit? Wondering if one head unit stops working do you need to replace the whole thing? Thank you again. I really enjoy your material.
Highly recommend you research the fan noise, from the condenser placement and room units. That, to me, is one of the bigger drawbacks.
One thing I noticed, it might be worthwhile to had additional insulation on your line set. It's evidently radiating quite a bit of heat that is cutting down on the efficiency of your unit.
Excellent advice.. 💯👍🏽
Another thing I noticed/wondered is why the line set was so long on the outside? Wouldn't that be another avenue for heat loss?
@@stevenwebber5998 Exactly, why not run the line inside the room?
@@timothyprice9064 ok, dude, that's a good point. That thought didn't even cross my mind!
@@stevenwebber5998 ....and why not run it inside as soon as it leaves unit ?
Excellent! Thanks.
We have 5 Fujitsu units in our home and there are a huge improvement of the radiant heat ceiling. I run 4 of them year round, the 5th is for the guest room. Our extreme cold is -14 and they have no problem. The only gotcha is you have to clean the filters every month on the blowers. Outside unit needs to be washed down every 2 to 3 yrs.
Well done vid, Ben. Unlike your tropical southern Minnesota temperatures, I had -33F yesterday morning as I cruised by the Mississippi River. I think the standard heat pump(non-minisplit) units that most HVAC guys install have a cut off temp that hovers in the 20F range. This mini-split unit would be a good option for those over garage bonus rooms that tend to be outfitted with baseboard electric.
My Trane regular split system works down to -7F according to Trane's documentation. It's never been that cold here.
Oh ya betcha! What heat source do you have in your bonus room?
@@BenjaminSahlstrom I have a 5Kw electric that keeps my bonus room warm, plus I do have a single flex duct from my furnace that pushes some heat. The 5Kw unit is on my off peak panel, so I get the cheaper rate at $0.0672 per Kwh. Same with my heat pump, slab heat boiler, and plenum heater...it's on the off peak controlled panel, so I'm seeing the propane furnace kicking on frequently during this arctic cold snap as the power company is controlling the panel fairly frequently. I've been supplementing with my cast iron Jotul wood burning unit that sits in my living room...nothing like a fire crackling away when the air gets brisk outside.
i prefer burning money. its 100% efficient at turning your money into heat
@@brianleeper5737 Is your train a single stage, dual stage, or continuously variable inverter unit?
Excellent video 👍👍
Amazing channel, Ben, congrats. You are a natural teacher. I have learned a lot from you. In cold areas, would it make sense to add a heat tape (those used to prevent pipes from freezing) around the return of the line, before it goes out of the house into the compressor (to help out in extreme cold days)?
I am putting in a heat pump tomorrow here in michigan. It is presently -8 Fahrenheit. I am running it through a traditional propane furnace so that when it gets this cold, I don't have to try to pull heat out of the outdoor air! It is only costing me $1,000 above what it would be for the propane only furnace and air conditioner.
So your heating air then pulling heat out of that air to heat your house? Sounds very inefficient unless I'm interpreting what you said incorrectly.
This is a horrible idea. I think you don’t really understand how this works.
@@jwill9877 I think perhaps I was not clear. This is the best of both worlds. I have the heat pump when that is more cost effective, then the propane when IT is most cost effective (below 35F). My ecobee thermostat tracks the outside temperature and uses whichever heat source is "cheaper."
@@rdmccracken I think I understand now. You are using the same ducting as your propane heater. The heat pump is outside the house where it should be and you decide which to use based on the outdoor temperature? The way you worded it the first time sounded like you had the propane heater preheating the air then you running that air over the heat pump coils.
@@jwill9877 Oh my goodness no. The evaporator of a traditional AC system becomes the condenser in a heat pump system. The two units swap roles depending on the need for heating vs cooling. The indoor portion of the system is installed in the furnace/air handler. The heat is generated by one energy source over the other based on outdoor temperature.
Great information. Nice to hear facts. Am I right?
Well explained
Thank you!
Great video always packed with knowledge. don't worry about the short.s we don't come here for fashion tips:)
That Flir is a great stud finder for exterior. Heat pumps are amazing how it pulls heat out of cold air.
It does not pull heat from outside
@@kevinkrug466 Correct. "it pulls heat out of cold air"
Ben. What an Excellent and informative class. Well done and thanks from Florida ps you can wear shorts here
This video has everything I like to see: clear presentation, numbers, links, and FLIR !! Thanks Benjamin! I might want to go and double insulate some of my lines, which are fairly long.
It's good to keep in mind that the price comparison to propane might change if propane cost included all the GHG effects (aka C-tax / C-levy)... that would make any electric alternative that much more attractive by comparison.
So the green house effect from coal powered electric? Or the disposal costs of fairly low life span of solar and wind?
Excellent presentation. Fortunately, my home has natural gas heating, and my gas bill last month (for January) was $60.00 to heat my 1850 SF house to 76 degrees F (24/7). I live in AZ in the Phoenix metro area. A heat pump would cost me much more to heat my home than using natural gas and in the summer my TOTAL gas bill (to run a gas hot water heater) averages less than $25.00 per month. My AC cooling cost on the hottest month in the summer was about $100.00. For this climate, it is the most energy efficient combination. In the winter we get temperatures that drop near to freezing (32 degrees F). My Trane gas heater rarely runs more than five minutes to maintain the temperature at night. Have a great week.
Hello. Do you have 2 stage or modulating heating stage gas furnace?
@@AlexAlex-nk6gy Hello, no, Trane does not require a two-stage gas furnace in my area because it is very hot most of the year. I live in the Phoenix metro area in AZ. It does get cold here for about three months of the year. It rarely freezes, but occasionally it does.
I just added insulation last year and I think my worst gas bill has been around $100.00. But keep in mind that I also have a gas water heater. So it is dirt cheap to heat my house. My typical gas bill is less than $25.00 for about eight months of the year. Then for about 3-4 months it rises to $50 and then $75.00.
thank you
Excellent
Great job breaking it all down. Should bust out your decoder ring and do one on SEER ratings.
Where I live, in Southern Ontario (Canada), the temperatures run around -20C (-4F) for two months of the winter. and -10C (14F) for another 2 months of the winter. That would give a COP of around 1.9 for the winter. The main problem is that we get around 2 weeks of -40C/F temps and Mini Splits just won't work in those temps, so that's why we use an oil burner furnace to heat our house (won't don't have A/C, it does not get hot enough to need A/C). Sometimes the temperature falls below -45C and the neighbours propane furnace won't work since the propane liquifies at -42C.
I've heater my house with a 36 thousand BTU and 2 heads (1 up stairs 1 down stairs) .. My power rate is 16 cents per KWH .. I've had this pump since 2012 and I record the power meter readings approx. twice a week every week since 2012 .. .. I also have electric heat but it's NEVER on , I only heat with the heat pumps .. In winter (here in Canada) when the temps are -10 to -20 it costs anywhere from $8 - 10.50 per day depending when the clothes dryer etc. are on ...
Heat pumps spend more time in defrost when the outdoor temperature ranges from 47F to the mid 20’s especially rainy/snowy/freezing rain miserable days. For best results try to install the outdoor unit where it’s protected from the wind...use evergreen shrubs or decorative barriers at least four feet away from the unit. Lengthy defrost cycles dramatically reduce efficiency.
Good tips.
@@BenjaminSahlstrom All good tips my installers neglected to mention when I asked for quotes. I certainly feel most of the installers in my area are singularly focused on getting paid. I even asked about putting the external units under my deck and they poo-pooed the idea. Many also wanted to hang the units right off the exterior wall behind my living room which I understand often creates annoying vibration.
Wouldn't more wind be GOOD? I has a fan in it. The objective is to equalize the coils with the ambient temperature, that's what the fan helps to do. Wouldn't wind help do that?
@@Chris-ie9os until the wind carries rain/sleet/snow into the unit lol
@@bryanjk If it's elevated that shouldn't matter... it can't accumulate. Mine is ~8' off the ground.
So I live in Vegas , I got about 2,5 cop .. and solar on top of my house , I love my heat pump
I will be moving to the Twin Cities soon. No central cooling in the house. Radiator heat so retro-fitting ducting isn't smart. I was thinking mini-splits in the two upstairs bedrooms would be the way to go. Nice to know that these hyper heat systems exist.
Nice video. But missing from all this conversation is, how many btu/hr do you need? I saw the infrared camera pick up your framing (thermal bridges for heat loss from inside to outside). Anyone building new or renovating really should run the numbers on insulation vs fuel cost, and try to strike a balance. I'd encourage people to familiarize themselves with the Passive House Standard, which includes super insulation, quality glazing, eliminating air infiltration and thermal bridges, and use of ERV. If you do these things first, you can reduce the size and operating cost of your heating and cooling equipment. Full passive house certification is more difficult and costly, but the base principles can be applied to any structure.
Also have to figure in duct loses as well with a traditional split system