I had a Carrier Performance 96 (2 stage, 60,000 btu) installed in August, and now that it's got a couple months of winter under it's belt, i'm wondering if it maybe wasn't the right choice for my home.
I've noticed that the only thing it uses 2nd stage for, is when the thermostat is programmed to increase the temperature (in the morning for example). It's never called on 2nd stage for maintaining the set temperature...even last week when it hit sub -35C temps outside.
Does this kind of behavior indicate an oversized furnace? The installer didn't do a heat calculation of any kind... none of the 6 companies I got quotes from did.. however they all independently came to 60k as the size.