Here in Central Texas we are having freezing nights. So glad I added the solar pool cover. Makes a huge difference. Still using the mylar blankets too. They make quite a difference. Using small Delonghi heater and a couple strands of rope lights in the 6 x 8 and it's staying 62 daytime and 56 night, with lights off nights. On patio my 4 x 6 temporary zip up GH is staying about 56 with the mylar blankets tented over the plants, two 65 watt light bulbs and rope lights for heat. My first year with GH and I'm happy to not be running all over the yard covering things every time it freezes. Looking forward to sunshine by the weekend.
Appreciate all the great mentoring and advice from all the greenhouse garden sages on this site. P