Replacing older A/C unit -- where to start?
imjazzer
7 years ago
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imjazzer
7 years agoRelated Discussions
Replace or Repair central A/C unit?
Comments (3)This is where my ignorance of HVAC matters will become apparent: What we have now is Carrier High Efficiency Model #38QH042310 Our house is 2500sf 2 story, inland. The guy said the duct work in the house is pretty poor with no ducts to the second floor, so even with a new unit we won't get much more cooling on the second floor. I don't even know if his estimate was for just the ac or ac plus heat pump. He did mention he likes to use Lenox units. I just didn't know what questions to ask! My husband is leaning toward just fixing it for now so we can do our research and get more estimates(don't people give free estimates anymore?!)...See MoreReplace compressor or new A/C unit
Comments (4)I live in St. Louis Mo. The Trane unit is 3.5 ton and is 16 years old. I have a separate de-humidifier. I have had great luck with the Trane thusfar. Bill...See Morereplace furnace & A/C units
Comments (9)The load calculator is sensitive to the inputs your provide. If you enter something inaccurate, it can swing your numbers one way or the other. So, get the inputs as accurate as you can. In particular, you might be overstating your actual insulation ratings. I shared my local calculations with dealers that came to my house. I told them that my own Manual J calculations called for a 32K BTUs of heating, so why are they recommending 80K BTUs at 80% AFUE = ~64K BTUs. Two of them decided to do their own load calculations and came back with smaller equipment including 60K BTU furnaces to match my 3-ton a/c system. So, ask your dealers why they are recommending such a big furnace. It's maybe because you told them that your back rooms weren't getting enough heat, so they automatically increased the furnace size. Maybe the solution was to seal/insulate the ducts or re-balance the air flow....See MorePerformance of new a/c's vs older models
Comments (5)Just to be clear, SEER has nothing to do with capacity, but rather efficiency. So a 16 SEER 24,000BTU AC will cool the same as an 8 SEER 24,000BTU AC but it will cost less to operate....See Moretigerdunes
7 years agoimjazzer
7 years agotigerdunes
7 years agomike_home
7 years agoimjazzer
7 years agotigerdunes
7 years agolast modified: 7 years agomike_home
7 years agosktn77a
7 years ago
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