We can open and close doors and also the heater vents. They have a little
arm that can adjust the amount of air blowing through them to near zero.
The sun room has double doors, and we just close the vents and the doors.
We have too many windows, and in spite of their being double paned, the
cold comes through on those -18° nights. Well, we only had one so far...
But anything under 10° is dang cold. Heck, when it’s up in the high 20°s,
I go out in a sweater and my house shoes because it feels warm, LOL!
LOL!!! It got up to 38 yesterday and I opened the back door (I left the storm door closed) and turned off the electric heater in my room. It was 66 in here and I loved it!