Thanks for sharing your experience. It's a shame that only 29 have given the video a "like." We have an uphill battle to get the public to understand the absolute need for blower door testing and educated load calculations.
Software and manual J do not size equipment to match it to the load on the coldest day. If you lost power for a day during a cold snap it couldn't recover the house if it was sized your way.
Glen Schmidt I size my equipment according to ACCA manual S, I’ll share a link. Staged electric heat, space heaters, would handle “acts of God”. www.acca.org/HigherLogic/System/DownloadDocumentFile.ashx?DocumentFileKey=2f0a6828-2205-e112-745f-7215c9a85541&forceDialog=1
7:28 "I did a very aggressive man J, including measured leakage, and it came back smaller than most would install. Tracking with my ecobee turns out Wrightsoft sized equipment nearly 3x what the house was using on a day that was below design temperature." 9:06 at 1° 27,000 BTU satisfies house.
Remember the fault isn't the software. They are required to size in accordance with ACCA in order to be approved software. Same can be said for all ACCA approved software.
Of course if you're going to be fine with 75 degrees when it is only 92 degrees outside, this is enough. that is way too hot for me (70 degrees). we are usually around 100 and have a lot of days between 105 and 110. we currently have a brand new 4 ton heat pump system that is totally failing to cool our 2500 sf house built near sacramento in 2001. 78 degrees upstairs on 89 degree day.
FWIW I ended up putting in a 1.5-ton Mitsubishi SUZ/SVZ. I have no problem maintaining 70° inside when it’s 15° - 95° outside. Sounds like you may have some insulation/air tightness/duct issues that your HVAC has to overcome.
Great video! Great real world load calc! Love the 1:1 ratio mention! Can you make this public? I'd like to add it to my channel, couldn't find it in search. Also, is it possible when the unit turned off that was a defrost cycle?
They can't. Up to the input person. Remember the fault isn't the software. They are required to size in accordance with ACCA in order to be approved software. Same can be said for all ACCA approved software.
You can do a couple things (I assume you’re talking about wall); remove a light or receptacle cover on an exterior wall, go off local building codes during the time of construction.
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This was the video that got me into load calculation’s
Mike Cianfrocco haven’t swapped it out yet.
Thanks for sharing your experience. It's a shame that only 29 have given the video a "like." We have an uphill battle to get the public to understand the absolute need for blower door testing and educated load calculations.
Great job Neil, thank you!
Michael Housh thanks buddy!
Software and manual J do not size equipment to match it to the load on the coldest day. If you lost power for a day during a cold snap it couldn't recover the house if it was sized your way.
Glen Schmidt I size my equipment according to ACCA manual S, I’ll share a link.
Staged electric heat, space heaters, would handle “acts of God”.
www.acca.org/HigherLogic/System/DownloadDocumentFile.ashx?DocumentFileKey=2f0a6828-2205-e112-745f-7215c9a85541&forceDialog=1
Interesting argument to justify being a hack!
"I size my equipment way larger than necessary in case aliens land"
7:28 "I did a very aggressive man J, including measured leakage, and it came back smaller than most would install.
Tracking with my ecobee turns out Wrightsoft sized equipment nearly 3x what the house was using on a day that was below design temperature."
9:06 at 1° 27,000 BTU satisfies house.
Remember the fault isn't the software. They are required to size in accordance with ACCA in order to be approved software. Same can be said for all ACCA approved software.
Awesome very help learned a lot here
Thank you
John Pearson thanks man, I’m glad you found it helpful.
Of course if you're going to be fine with 75 degrees when it is only 92 degrees outside, this is enough. that is way too hot for me (70 degrees). we are usually around 100 and have a lot of days between 105 and 110. we currently have a brand new 4 ton heat pump system that is totally failing to cool our 2500 sf house built near sacramento in 2001. 78 degrees upstairs on 89 degree day.
FWIW I ended up putting in a 1.5-ton Mitsubishi SUZ/SVZ. I have no problem maintaining 70° inside when it’s 15° - 95° outside. Sounds like you may have some insulation/air tightness/duct issues that your HVAC has to overcome.
Great video! Great real world load calc! Love the 1:1 ratio mention!
Can you make this public? I'd like to add it to my channel, couldn't find it in search. Also, is it possible when the unit turned off that was a defrost cycle?
Nate the House Whisperer I watched turn off completely at 3°. It’s possible some of those were defrost.
Waiting for the follow up on the cooling side !
Mike Cianfrocco it’s about 25-30% oversized.
Neil Comparetto So do you think a one and a half ton is a better fit?
Mike Cianfrocco I have enough cooling data to feel comfortable putting in a 1.5 ton... If I’m a little short I’ll do some attic work.
Great video! I wish wrightsoft would only allow modeling with blower door input. It should not be a choice!
Jeremy Calvin thanks man!
They can't. Up to the input person. Remember the fault isn't the software. They are required to size in accordance with ACCA in order to be approved software. Same can be said for all ACCA approved software.
Good info
Rob HVAC thanks Rob!
so if we dont what whats in the house insulation wise? what do you do? SWAG it?
You can do a couple things (I assume you’re talking about wall); remove a light or receptacle cover on an exterior wall, go off local building codes during the time of construction.