This year, I bought myself a portable greenhouse and was very excited not to have to cart things back and forth from the garage. Even better, my husband was thrilled not to have his garage overran with my plants. Everything was going smoothly until record breaking (to my memory) low temps hit our normally warm city for a solid week. By low temps, we're talking 20's, but that's not normal for us. I had already bought a little heater for the greenhouse becuase my succulents don't like to be below 45 degrees. Very diligently, I would go out and turn it on and then adjust it before bed. I managed to still kill my only two Pitcher Plants, of course it would be some of the most expensive to bite the dust first. I added another heater for the week of the artic blast and on the first night felt real smart when I went to bed with them both running. It wasn't until the next morning when the blow dryer wouldn't work that I knew we had a problem. I put the two heaters on the same outlet and evidently you can do that without blowing a fuse.