Interesting article on heating a garage turned greenhouse in zone 3 where it gets below zero a lot of the winter. In this article you will see how thermal mass helps to keep a huge garage from freezing.
The garage was a huge old thing when Northern Homestead decided to turn it into a greenhouse with aquaponic fish tanks and a chicken coop. They share how they originally thought they would have to heat the greenhouse with a rocket stove but after insulating the entire garage really well they found out that the thermal mass from collected rainwater helps hold and give off heat when the temperature drops.
I know that not many folks will have a huge old building like this to convert but some will and the concept would probably work in a smaller garage although you would probably need to add windows and there may not be enough room for the fish and chickens. If you could grow food year round though it would be worth the effort, especially if you didn’t have to spend a lot of heating the greenhouse. I know the barrels or what ever containers you use to create your thermal mass will get a lot warmer if they are painted black and can soak up sunlight in the day time.
The black soaks up more sunshine so the water would get a lot warmer than if they were a lighter color reflecting the sunshine off the containers. If you have a garage or old building that might be suitable for a greenhouse you might want to read about heating a garage turned greenhouse.
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