"Thank you for the nice post. Remember that the important thing is the actual superheat that exists entering the compressor is what we really want to control. Superheat serves only one positive purpose -- protecting the compressor from…"
"Tim, You are welcome. I think what the others' responses were focused on is the concept that the AC should cool down the house in a few minutes from a hot soak. A well designed and installed system will make a dent, but it can't pull it…"
"Tim, in answer to your questions:
1) Can a 4 ton system with long duct runs cool 2 floors at the same time? a) a 4 ton system that is working properly CAN COOL a well designed and built 2 story house with a floor area of 3100 sq ft. Rick…"
" T. Thornton: Dear T. There are multiple items in your comment that bear some response. First is the zoning issue. I strongly suspect that the reason the house is not getting cooled per your criteria is that the AC is actually delivering way…"
HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More
"If we want to actually do something about the amount of energy the US uses in heating and cooling buildings then we need to get into them and retrofit them with the things we know works. No fancy simulation programs with a lot of assumptions are…"
"Chris I think it is way too risky to think these can be assembled on site by homeowners given the experience in other countries and with professionals in the US. On the other hand we need to fix the problem. There is no reason that…"
"Bob Almost everywhere (except places like Riyadh) there are occasions of dry in wet climates as well as high humidity in dry climates. However predominantly in many parts of the US and elsewhere, the majority of the time when the air conditioner is…"
"Bob You are hitting on a important point -- the length of the time delays are very important. The typical 90 second time delay on some ACs is set to take advantage of the mass of the evaporator coil and get a higher SEER rating. The applicable SEER…"
"Bob your point about surface area is right on. To elaborate, put in the smallest AC/furnace that will do the job, put the air handler in the center, run the ducts to high inside wall deliveries or center of ceiling, run the duct on the floor of the…"
"George: As Iain noted the ASHRAE 152 calculation is pretty good and has stood the test of time. There have been field tests that showed how well it did against monitored data. (I can send you some) More recently we have found…"
Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!…"
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