I was just talking to my contractor / installer about a Trane XL16i, and he came back with some numbers on a Trane XR14 coupled to an Aspen coil. I'm not sure of the model of coil, but he said that the efficiency numbers on it and the furnace were enough to make the entire system qualify for the tax credit.
He's a friend that is trying to put together something for me that will be efficient and not break the bank, but I'm wondering... Is it worth it to save a few bucks (not really that much in the scheme of things) to cobble something together, or is it best to get the entire Trane system from soup to nuts. I've seen the term Frankensystem a few times and am wondering how bad it is to mix brands.
Being in Houston with a 2 story house, we're getting 2 complete systems replaced. As we use the A/C 10 or 11 months of the year, with many of those months being mild temp (except for the hottest part of the summer), am I correct in my thinking that a 2 stage compressor would definitely be worth the money? Maybe not as much savings during the middle of the summer when it has to run full-bore, but in the other 6 months of of a/c weather there would be some savings?