I have a split level ranch 2000 sq foot total. The gas furnace is 30 years old. I am looking at Ruud for both furnace (80%, 2 stage)and ac. The registers are near the floor for most of the house, especially upstairs. Here are my questions:
1. I don't understand the difference between variable speed motor and multiple speed motor for the furnace and also the upflow and downflow furnaces. Presently I have a vertical downflow unit.
2. I was given an estimate with a 5 ton coil and 4 ton furnace (need to move 4.5 - 5 ton air total, 3.5 above). Is it possible to do mismatch components like this? Someone said the coil might freeze, is this correct? Would it still be under warranty?
3. Any websites I can read up some pertinent info on?
I hope you guys can give me some valuable input on these matters.
Just a single gal looking to make informed choices