Thanks, I'm not sure on the 80% eff, its what the installation guys suggested. I don't know a ton about furnaces since this the first time I've had one, previous homes in another state never needed them. Most of the winter our lows are in the 30-40s, some days getting to the 20s and a few rare ones in the teens. We have a Nest so that should be able to handle the 2 stage.

What is your location?...

find out if the Nest can handle control and staging of the 2 stage XV80 furnace....

@tigerdunes Austin, TX. No company seemed to think the Nest would be an issue unless we wanted variable stage equipment. At this point we are close to picking Company A, but were curious if there would be any savings at looking into the American Standard equivalent of the Trane equipment.

Good point by Mike...I would lean to getting refrigerant lineset replaced...

IMO

Not sure if that is covered, but the quote lists this as well

"Installation change out items included digital or programmable thermostat, hard

pipe gas with drip leg, gas flex line, water safety switches on main drain line and aux

pan, new platform as necessary with filter base on up flow systems, new drain pan

for horizontal systems,condenser slab, new whip with disconnect if needed."

If the lineset is accessible, replace it (only a couple hundred dollars). Unless you have a good reason not to go with company A, I'm not sure I'd give company "B" the time of day.