If you need towing Via motors is the only one I know of that will fit the bill.
But they are too expensive.
VIA Motors Extended-range Electric Trucks, Vans & SUVs EREVs
The Volt does not have a heat pump the leaf does.
http://www.nissan-global.com/EN/TECH...in_heater.html
I ran the AC this weekend and I drove the same trip a little over a hour away. I charged up and did the same trip again the next day.
On the way out it way 97 F I got 40 EV miles on the way back it was only 87F I got 41 miles EV.
Without AC I would have gotten a couple more miles maybe 43.
I put Michelin defender tires a while back that hurt my range that same trip with stock tires I would have got 45-46 EV miles.
I the stock tires are a bad design just hit a curb hard and you blow out the side wall. Everything is a tradeoff. The 2016 Volt has OEM Michelin tires now.