They project we will get down to 24 tonight. Today is sunny and about 65. My zippered up small GH on the patio got to 93 and I had to open up the zippered door and vents. Tonight will be challenging. Last night was about 34 and I made a bit of a "tent" over the plants in the GH with the mylar blankets. That made a huge difference. The night before the GH got down to 48. Last night it was 55-- with heater at same temp. So I guess I'll be tenting the plants tonight and keeping the little heater under the tent - there's plenty of room between it and the top of the tent, so no fire hazard.