outside was 46 degrees, inside was 50 at 6:00am. I still have a lot of work to do though! I just picked up a 4" DC fan at Radio Shack of all places. 72 CFM for 4.57 watts! I just ordered a 5w solar panel on Amazon and it should be here in a few days. So I need to come up with some kind of housing for the fan and mount it to the PVC tubing.