Sort of answered this before. Will go a little deeper.Curious about this- since the heat pump can make heat or cold why bother with adding propane furnace on top?
Sounds like the Lennox guy blew it.
1) Heat pumps are good, modern heat pumps are really good. So I have nothing against them other than they run on electricity and older models were not great at either end.
2) I love the energy density of propane. It's expensive per unit but with just the two of us, we hardly burn through it. And of course it's already here. We have a 500 gallon tank, we have been here a month and the tank volume went from 46% full (we purchased the remaining fuel with house deal) to 45%. This of course is no indication of dead winter, but we have used the (old) heater and it's quick. BBQ, grill, fireplace, WH hooked up!
3) The cost adder for adding a modern propane furnace is in the budget, easily. I am of course infatuated with dual fuels. By all reports, the system is fairly intelligent. I am fascinated to see how it works.