Hello, I recently built a fairly nice, two room grow space. The idea was to seal it and run CO2. However, my temps are around 95F when it is sealed and lights are on. So I have to leave it open almost all day in order to keep the temps around 80F. My question is this: what is the best way to cool my space and keep the temp constant? The area is 100 Cubic feet and I'm not looking to spend an insane amount of money. Any suggestions?