Still, seems kind of overboard to me. But, that's just life.
By the way, a large black (or dark coloured barrel) filled with water (rain or hose ) will warm up during the day and slowly give off heat at night keeping a more uniform temperature in your garden for your plants. (Stew your compost or leaf mold tea in the barrel and kill two birds with one stone.)
One of these in the green house is also a great idea.
Oh, and What to use as a tea bag for your compost or leaf mold? I use a burlap sac. Just went down to my local farm market and asked Vern for one. He wouldn't even accept any money.