I have a 1486 sq ft ranch on a finished basement north of Detroit, a dual stage, dual speed American Standard Furnace, 11 yrs old (80%) which is 80000 BTU. I also have a 1989 Lennox central AC air conditioner that is finally dying, this last hot summer killed it, sorry I do not have the model in front of me but I do know it starts with 18-31 which I am told is a 30000 BTU unit (2.5 ton)?. Hi efficiency windows in last 10 years, standard insulation in walls and ceiling, and house wrap when re-sided 2 years ago. Up to this summer, the AC was able to keep up, but struggled at times in 95 ° heat, in the end, she would just start freezing up, compressor almost dead quiet, when it was working you could hear it 3 houses away.
I was going to just replace the AC due to the fact the furnace has some years left in her and it works great, but after looking at some of the new furnaces and available rebates and talking to 3 companies, I am considering upgrading the Furnace to a 95% efficiency model and a 15 or 16 SEER AC system. I do have 1 more company coming out that installs just about every make under the sun and they are a very reputable company as well. Interested in what they have to suggest, that is next week. Want to get this done before the winter sets in, especially if a new furnace is in the picture.
My dilemma is: The Lennox contractor calculated that I need 2.4 tons + 10% so he recommends going to a 3 ton unit, The Sears guy, selling Kenmore name as well as Carrier, states to go with a 2 ton AC. I had an independent contractor out last night, has a very good reputation in the area, selling Goodman, said that a 2 ton 16 SEER with a 3 ton A coil would be the correct size for AC system. In talking further, he told me about the matching furnaces as well and how they play together on the higher end units for most of the major brands which sounds like a good idea as far as environment control. This furnace discussion was prompted by me looking at the two stage AC units. Looking at the Goodman DDSXC16 AC and possible the GMVC95 furnace
So, a couple of questions from you folks in the know: What size AC system sounds appropriate for the house described at 15 or 16 SEER? Is Goodman reliable for both AC and furnace if installed correctly? I do not see a lot of negative feedback on Goodman equipment like I do the others. I am pretty much already done thinking about Sears just due to the bad publicity concerning the way they handle there service. I was actuall looking at Goodman, Amana, and possibly Carrier units as my top picks.