I use a 1200 watt heater to heat my greenhouse at night as needed. It is smaller 6x7x8 greenhouse. The heater works perfectly and manages 20 degree nights well. It is all my cool weather vegetables need to get an early start. I discuss some basic tips I learned through trial and error. I also show you how to calculate the electricity cost.
New to Gardening? Check out my 2nd Gardening YouTube Channel dedicated to New Gardeners. The videos are longer and more detailed. Each video presents as if you are new to gardening.
https://www.youtube.com/channel/UCAPRtyacJ69AUdb7o-TZLSw
Join My Google+ Gardening Community called Our Tomato & Vegetable Gardens – we are approaching 5000 world-wide gardeners: https://plus.google.com/communities/114956817444053979636 or Link from My YouTube Page.

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