I'm upgrading my heating, and have 2 lennox high efficiency propane furnaces to offer. Both are about 15 years old, and in good working order (we are using them as primary home heat this winter).
Approx dimensions 20Wx28Dx72H (with blower). Both are Lennox G51MP series, I think 91% or higher efficiency. I don't have tonnage: one is a large (5 ton?) and the other perhaps 1.5 ton. They will be available for pickup in a couple of days, and need to be picked up within a week.