Byf: does the temp in ur GH even out with the outside overnight? Mine is fairly well insulated, with my lil buddy heater I keep it 50+, without it the temp will be within a few degrees of outside air by midnight.
Schrews- I'm just north of u at higher elevation, looking like 7-10 days of nice weather for me so should be same for u.
It stays about 10 degrees warmer. My floor absorbs heat all day and radiates it back out at night. I've gone outside with 25 degree outside air temps and had all my plants in the green house pointing towards the sun.
I used to be in to heaters and shit but I realized I'm just making my plants weak by coddling them ...One year I kept the GH in the high 60s then plugged and it was 35 , they were like NOPE!!
It's all about acclimating them to the outdoors...there's no heater in the field
This is my last season outdoor , next year we will be 100% greenhouse. In all my ganja fields I'll be planting stone fruits