Thanks for the response. I've ordered the book.
My main objective is to keep some patio plants alive through the winter. I would also like to grow some vegatables and other plants during this time. I also plan on starting all of my garden plants in the greenhouse, from seeds.
Winters here in west Tennessee aren't very harsh (daytime temps usually 40's - 50's, nighttime temps usually 20's - 40's. The greenhouse stays plenty warm during the day but cools really quickly at night. I would like to be able to divert the heat from the
greenhouse during the day.