Yes, Sheryl, one greenhouse is dedicated to orchids and seedlings and the other to all my other tropical plants. I have two heaters in each greenhouse, and with our temps getting down into the low 30's the past three mornings, they are running a lot. It will remain in the 30's for low temps for the next few days, so heaters are a necessity. My greenhouses also get hot in the spring-fall and I have two fans, one in each end of my greenhouses. They run automatically from 8:00 AM until dark. I also leave the doors open in each during the warm months and there are vents in the roof as well. Of course, all my tropicals, except the "baby" orchids go outside in March, and remain outside until mid to late October. The orchid greenhouse remains pretty full year-round and the "all other tropicals" greenhouse is pretty much empty from March until November, unless I am growing veggies from seeds.
I will post some pics of the two greenhouses when I have a chance to get outside and photograph them. Ken