I'm soliciting bids for a dual fuel system for a house I'm building in western NC. Looks like a 2.5 or 3 ton HP is going to work. I don't have much need for the cool side of the HP but can use all the heat I can get. My original plan was to just get a 15 seer unit that was single stage and just accept that it would be overkill on the cool side. Then, both the Carrier and Trane reps said that for just a "few dollars more" I could upgrade to a 16 seer unit that would be a two stage HP with the idea that the cool side would probably just operate on the first stage of cool. That seemed like a pretty good idea to me. Now another Trane dealer is trying to convince me that instead of a 16 seer unit I should go with their 20 seer unit because he says it actually has 2 compressors, instead of just one. Obviously there is more cost involved.
What do you pros think? Is it worth it to have 2 separate compressors? As I previously said, the cool side is not a big deal for me. Also, I thought I had read in these forums some time ago that the higher seer units were less reliable than some of the more 'standard' units.
Please give me some of your thoughts. I'm sort of leaning to the thought that 20 seer is overkill for my needs.