Hello guys. Thanks for joining. This time the giveaway is ended. The winners are u/HarryButtwhisker & u/-Rioht- . Congratulations! I will PM you, please check your message. Hope you guys have a good day. (If the winner does not reply within 72h, we will re-draw the winner at random.)

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Depends on what you are growing. If you're just overwintering citrus, and the outside temps don't drop much below 32, you're probably fine. Starting or growing vegetables you will need at least a heat mat, and potentially something to keep the greenhouse above 40 or 50F. I keep my low temps at 48~52F because I'm an orchid fiend.

Greenhouses lose heat fast. Especially if you use single pane windows. Most greenhouses these days use Twinwall, since it helps diffuse the light, as well as has a slight R value. My tiny little Harbor Freight greenhouse manages quite nicely with a $50 ceramic heater, a dehumidifier, and an Inkbird controller.