How to Heat/Winterize Your Greenhouse

Time Stamps: 0:25 My greenhouse goals / 0:43 Managing olives and citrus in the winter / 1:45 Tour of plants / 3:43 Insulating the greenhouse / 4:50 4 Ways to Heat Your Greenhouse

Four ways to heat your greenhouse this winter season:
1. Greenhouse Grade Plastic
I wrapped my entire greenhouse with hoophouse plastic to keep drafts away and hold heat within the structure. I literally wrapped the entire house with the plastic and affixed with a staple gun. I found mine here: Happybuy Greenhouse Film 15 x 40

2. Heater
A heater is an obvious choice, especially on extremely cold days, however it quickly drains energy. If the greenhouse isn’t properly sealed or has drafts, any heat generated by the heater will rise and escape. Improperly attached extension cords can cause a fire.

3. Thermal Mass from Water Drums
Large 50-gallon drums can be filled with water. Water loses heat more slowly than air. If plants are crowded around the drums, they will benefit from the atmospheric heat provided by the drum. In the spring, water from the drum can be used to water plants.

4. Reflective Insulation Board
If you have a wall to spare, or can sacrifice the north side of your greenhouse, a large sheet of reflective insulation can be helpful. The insulation maintains heat within the greenhouse, while the mirror-like surface of the board captures and reflects light and heat from the sun back into the greenhouse.

​Other options include a composting floor, and erecting your greenhouse on the side of your home to take advantage of heat. Straw bales can form a perimeter at the base of the greenhouse, but just remember heat rises—if the roofline is not sealed, heat will escape. Finally, I paint my greenhouse interior black to attract the sun’s rays and hold heat.