[calvinfo]

Thanks for giving it a try!

We've tried to make this a little clearer in the "receipt view", but the major difference is in terms of cost of the hardware.

Furnaces, heat pumps, and A/C units all have a 15-20 year useful lifetime.

While the annual savings will be only a bit less, the hardware cost will be _significantly_ less because you only need a one unit for a heat pump vs two for an A/C + furnace combo.

Does that make more sense? We'll try and clarify in the UI

[ars]

If you already have an A/C a furnace is very very cheap, so cheap it's almost free (i.e. included with the A/C).

I don't see how you can possibly save $37,000 just by getting rid of the furnace - they just don't cost that much.