Yes agreed. Rules of thumb lead to in-efficient houses that tend to be uncomfortable. We all know that HVAC contractors are worried about call backs for not cooling on hot days. This leads to oversized equipment which costs more to install & operate. This oversized equipment also doesn't dehumidify properly as it's not running long enough to remove latent loads. So the cycle continues... That's where my blog comes in! I'm trying to educate clients, builders, AC contractors, everyone. -Matt
I really like the metaphor used regarding the car driving up the hill. And then asking about trying to maintain the same speed only using the ignition. That was an excellent comparison. Thanks for the video. Much appreciated.
It does appear that there is less penalty to oversizing a VRF system. However, in my experience the issue is that at lower running rates the VRF has a reduced latent capacity. This is especially prevalent in tight / well insulated houses. Two lessons learned: 1: Install a Dehum with all HVAC systems in a Hot&Humid climate. 2: Size your system according to the Man J relatively tightly. i.e. if Man J called for 3.7 tons install 4 but don't goto 4.5. Hope this helps, Matt
the HVAC guys in central NC generally say there is no need for fancy equipment, just reliable brands. we have a mixed hot/humid climate. I'd like to know the payback on stepping up to high-technology equipment for mild climate areas.
For the majority of homes under $1M in Texas, man J never happens. It's a crude rule of thumb (sqft/tons) for HVAC sizing. And it seems like very few HVAC installers want to learn about the fully variable systems like IQ drive (and variants), or the inverter type systems used in mini-splits. Builders don't care either, because so few buyers will pay more for the better tech--just need granite tops and pretty bathrooms. So the migration to better HVAC tech is painfully slow.
Thanks for the videos! Is a strict manual J calculation as important when you are putting in variable equipment? It seems like putting in oversized equipment isn't as bad when the equipment can scale down. I am not saying it is ideal to put in oversized equipment. It just seems the correct sizing was more important when the systems were "dumber".
Yes agreed. Rules of thumb lead to in-efficient houses that tend to be uncomfortable. We all know that HVAC contractors are worried about call backs for not cooling on hot days. This leads to oversized equipment which costs more to install & operate. This oversized equipment also doesn't dehumidify properly as it's not running long enough to remove latent loads. So the cycle continues... That's where my blog comes in! I'm trying to educate clients, builders, AC contractors, everyone. -Matt
I really like the metaphor used regarding the car driving up the hill. And then asking about trying to maintain the same speed only using the ignition. That was an excellent comparison. Thanks for the video. Much appreciated.
I think it's false analogy.
@@บางกอกเอมเพรสซ่า I don't, it's almost indentictle.
Any reasons for your opinion.
It does appear that there is less penalty to oversizing a VRF system. However, in my experience the issue is that at lower running rates the VRF has a reduced latent capacity. This is especially prevalent in tight / well insulated houses. Two lessons learned: 1: Install a Dehum with all HVAC systems in a Hot&Humid climate. 2: Size your system according to the Man J relatively tightly. i.e. if Man J called for 3.7 tons install 4 but don't goto 4.5. Hope this helps, Matt
Matt Risinger
Thanks for all vedio
I hope that make contact with you.im Hvac engineer
So much thanks
the HVAC guys in central NC generally say there is no need for fancy equipment, just reliable brands. we have a mixed hot/humid climate. I'd like to know the payback on stepping up to high-technology equipment for mild climate areas.
For the majority of homes under $1M in Texas, man J never happens. It's a crude rule of thumb (sqft/tons) for HVAC sizing. And it seems like very few HVAC installers want to learn about the fully variable systems like IQ drive (and variants), or the inverter type systems used in mini-splits. Builders don't care either, because so few buyers will pay more for the better tech--just need granite tops and pretty bathrooms. So the migration to better HVAC tech is painfully slow.
Thanks for the videos! Is a strict manual J calculation as important when you are putting in variable equipment? It seems like putting in oversized equipment isn't as bad when the equipment can scale down. I am not saying it is ideal to put in oversized equipment. It just seems the correct sizing was more important when the systems were "dumber".
Awesome video
Great stuff! I always wanted to be a science geek.....just never had the enough brains...LOL....thanks for loading
hi do you have agent in bangladesh for heavy airconditioning .
Where's part 2!