Wow. What an amazing community!!!! I did not expect more than one reply when I logged on. Thanks for caring, everybody!!!!
I didn't mistype.... it really *is* 40 degrees warmer in their covered house than outside.
The house is small- 3' by 4' by 3' with a 4' by 8' attached cage/pen.
125 heat lamp attached to ceiling.
There is a door leading to an outside pen that is only covered with a towel, so it is very "drafty" especially if there is wind. They always have access to the outside area, but usually once they are in for the night they move into the heated house to sleep.
I will downsize the light and see if that doesn't make a difference. I wasn't sure if holding the house at 40F, regardless of outside temps, was the right thing, and from the [perceived] gasps of horror from GoingQuackers I would guess not. So then, do I shoot for roughly 10 degrees higher in the house when temps are in the single digits or below? Or *is* there a bottom at which they are comfortable? Should I shoot for 20F when temps dive?
Again, what a welcoming community!!!! Thank you so much for the help!!!