In a Greenhouse do you need a Heat Mat ?
I'm thinking of getting a Heater and have Fans circulating the air.
This is like January and February.
big rockpile
We don't have anything growing in Jan/Feb - other than some cold hardy stuff that I want to give a bit of extra protection.
However, once I get to about April I'm starting to want more seedlings out in the greenhouse and in our climate it's still way too cold for anything that's not fully hardy. Last year we installed solar panels and solar generators for the house. By April there's a decent amount of sunshine so we have a moderate amount of free electricity to spare. We installed soil warming cables in our polytunnel raised bed, and also in sand trays on the bench in the polytunnel. This is a huge success - free to run in our case and enough to raise soil temp in beds and pots by a few degrees. By using fleece and even foil blankets when it's very cold you can trap the warmth in. It makes a big difference.
But trying to heat a large area and circulate the air in a greehnouse will cost a small fortune. I don't think it's viable. Better to heat a small space (e.g. a coldframe within a greenhouse.
