[Riwright]

We've camped down into the 20's pretty comfortably. Into the 30's without an electric hookup.

A few things we do to improve comfort.

I cut pieces of reflectix to fit and close them in behind the curtains. This limits heat loss through the glass. You can get a roll that is already the right width. Just cut to length. Marking which window is goes in is helpful.

Glad press-and-seal over the inside of the roof vents works well. It lets the light through and keeps the cold air out. Cheap and easy to remove.

Three inexpensive fleece blankets used to seal around the edge of the bed really helps with drafts.

Spare towels go along the flap seals, under the door and under the slide.

I plan to work on the weatherstripping, it needs some improvement.

We have several sources of heat. We use the original furnace when we need a lot of heat fast. Really warms the place up. We also have a Platinum Cat. This is a permanently mounted vented catalytic heater. At 5000 BTU it's good for about a 20 degree bump from outside. With the venting you can run it all night. We also have a "Buddy" heater but we don't run that when we sleep.

When we come in from outside we run the furnace to get the place warm. We run the catalytic supplemented with the Buddy while we watch TV or read. When we go to bed we run the catalytic or nothing.

We have electric bed warmers but we've never used them. Big covers, double socks, sweat clothes and a knit hat seem to do the trick. We like to sleep cold!

We keep the water in the fresh tank, no water hookup. We try to keep the grey tank empty, especially overnight.

If you have electric, a space heater is a great thing to have. I plan to put an electric plug on the same circuit as the air conditioner. In the winter I'll use it for a second space heater.

All this can keep the trailer downright cozy.