I am a homeowner and I need to replace my 15 year old Armstrong 100,000 BTU furnace. I have a two story home ~ 2700 sq ft. plus ~ 900 sq ft finished basement in central Indiana. I received quotes on the following systems:
1) Amana AMV91155 115,000 BTU, 10 years parts and labor warranty (although I thought the rep told me 20 years but he wrote 10 years on the quote), lifetime warranty heat exchanger, 2 stage, variable speed.
2) Lennox G61V 110,000 BTU, 10 years parts 5 years labor warranty, lifetime warranty heat exchanger, 2 stage, variable speed.
3) Carrier 58UVB 100,000 BTU, 10 years parts and labor warranty, lifetime warranty heat exchanger, 2 stage, variable speed.
4) Carrier 58MVC100 100,000 BTU, 10 years parts and labor warranty, lifetime warranty heat exchanger, 2 stage, variable speed.
Two of the companies – the one for Amana and the Carrier 58MVC - did load calculations. Once the Amana dealer did the load calculation he said I could get by with a 90,000 BTU instead of 115,000. The Carrier 58UVB dealer said he could get a Payne (which I guess is made by Carrier) furnace to match my A/C unit. I am not sure if having the furnace be the same brand as the A/C is that important. Also, the Payne’s labor warranty was not as good as the Carrier’s labor warranty.
From what I have read so far is that how the system is installed is just as important as the brand name. But I want to know is there a significant difference in the quality/performance of the systems I described above? The dealer for the Carrier 58MVC100 included a Honeywell VisionPro thermostat which I thought was important since I read that you need/want a thermostat that takes advantage of the 2 stage furnaces. Cost wise the Amana was the most expensive with the Carrier 58UVB the least expensive, with the Carrier 58MVC and Lennox in the middle. I was told each of the systems qualified for the tax credit. I believe each of the companies would do a good of installing the system. Any comments would be appreciated.