We've had both dual pane windows and heat pumps on our old coach as well as our new coach. Dual pane windows offer better insulating factors in summer as well as colder temps. And depending on the quality of coach, you should not have to worry about windows fogging. We updated to a new Anthem with the dual pane windows and our old coach(2002 Travel Supreme) had them also. We never had an issue with fogging. The heat pumps are also a great idea. You may not use your coach in the winter, but using your coach in the North in the summer. It still can be a bit chilly overnight. And the heat pump can give you heat without having to fire up the propane heater. We've used our coach into November and were able to use our heat pumps instead of the heater. I know it's an option on most coaches, or they'll give you 1 out of 2-3 AC's with heat pumps.
In my opinion I would not consider a new coach without either!
Dana & Shari and the Buster
2012 Entegra Anthem 44DLQ
2006 Envoy Denali Toad
