confused about how to tell total btus of this american standard single speed 2 stage gas furnace 80% AFUE model #AUD2B080A9362A. I looked at the specs online & it shows the first stage output at 41,600 btus & the 2nd stage output at 63,000 btus---so what are the total btus of this furnace? is it 63,000 + 41,600 = 104,600 btu or 80,000 btu?
i ask because the american standard furnace will replace a 1983 carrier gas furnace model no. 58SS080-BC that states it is 95,000 BTU input, with furnace size at 080 BC. is this carrier furnace a 95k btu or an 80k btu? one contractor said the model number indicated it was 80k btu.
also the american standard specs online says the AUD2B080A9362A uses a 17 x 25" filter. contractor wants to change size of my filter from 14 x 20 x 1" to 16 x 25 x 1" would it matter that it's not 17 x 25 x 1"?