Thanks again! That helps me out big time. I was worried I had to have fresh air and not just for temp purposes. I know the buckets of co2 boost are expensive but would it be worth hooking up a couple of buckets and the the fans blow on the plants? I have an all electric house and in no way could I use a generator. I was told co2 is co2 and id doesn't matter where it comes from but I still need to know if there is a way to monitor if they are getting enough.