Greenhouse: greenhouse heaters, 1 by weeding

weeding wrote:
For the past 3 years I used a small electric heater to heat my GH. My Gh was 10x12 ft. I used an outdoor timer that could take the heater wattage. I set it for 30min on and 30min off, throughout the night. I did not need to use it during the day, because the sun wood heat the GH sufficiently. The first 2 years I had a GH with plastic on it and I placed insulation around the sides. The heater worked great.