Thanks Barb,
Trying to keep things around a 50*F minimum, haven't been able to test the heater out since adding on to the GH.
Until last night at least

, at around -1 F this morning, the temp inside was at 43*F
The door is frozen shut, need to wait until the sun thaws things out a bit to take a look inside....
I have a couple CFL's strung up for supplemental light during the winter, no real on/off schedule, depends on whether I remember to plug them in
The biggest problem I'm having is icicles on the ceiling thawing and dripping cold water on the plants.
Steve