Growing and Heating in a Greenhouse

December 14, 2011 3:26 pm

I live in Northern Utah so our days are really short this time of year. I just started seed again a few weeks ago, and I simulate longer warmer days for these new seedings from germination till about 3 weeks.
To do this, I put a 4′ flourescent light almost touching the flat. This flat has a clear plastic dome over it, to keep the heat in and let the light in.
Flourescent lighting gives off a little heat, but I heat my greenhouse by using roofing cables that are used for melting snow on the edge of the roof.
I run them back and forth under the beds and put them on a timer to come on about 5pm and go off about 8am. They are waterproof and use very little energy. They could be hooked up to a solar panel.
If I am expecting it to be below 10 degrees, I will put a little radiator type heater in the greenhouse, on a timer to come on when the sun goes down.
If it is going to be below zero and windy, I will cover the plants with a layer of bubblewrap or 6 mil plastic¬†as another barrier. I haven’t had to do this very often though. You could just use the second layer if you don’t have a really cold climate, without additional heat.¬†Greenhouses and plants,collect heat in the day, and use it in the night to stay warm.
The North wall of my greenhouse has insulation foam to help keep the heat in also.
This has worked really well for the past few years.

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