Looking for advice from people who know about this. I have a new xv95 gas furnace, which replaced a Carrier Weathermaker circa 1990. The AC unit (also Carrier) still works, but when the time comes to replace that, I am thinking of going with a heat pump.
I live in Ohio. Average winter temperatures swing terribly -- we can have highs in the 20s for a week or two, then in the 30s or 40s, then be in the teens. Lows can be anywhere from 30s to single digits. So conditions seem right for a HP, as well as gas for when it's colder. Summers get kind of humid -- dew points in the high 60s and highs in the low 90s are about as extreme as we get, with the occasional high 90 day. Usually we are high 80s, dp mid 60s in summer.
I've read up on the Trane XL HP models and my main question is: should I go single or multi stage? (I understand that the 16 is a multi-step and the 19 has two compressors). Either way, how much of a difference does this make on the heating side of things? I'm under the impression that when heating, the aux heat is the electrical strips. Does this essentially make every heat pump a two stage system (first stage = compressor, second stage = electric)? Does a multi-stage hp stage the compressor(s) when heating, before the electric strips are used? If so, what controls this?
Sorry about the long post. Thanks for any advise.