Your title got my attention!
Another thing you can do is get some insulated/foil backed material and apply it under the floor and against the backside of the doghouse area. Hotrod shops sell it in different thickness and sizes. Try "Jegs" or "Speedway Motors".
Good luck, and I'm sure you will have a "Cool Wife" soon!
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!