Chiller sounds like the only solution. I see you mentioned small house., so no spare bedroom I guess. HeheThey were sitting directly on the floor initially. we now have them up on 2x6 stands to get them off the floor and allow air to circulate under the buckets and res. The ambient air temp outside the tent get up to around 68-70*. And it seems to be getting warmer and warmer every week. We have the opposite problem here with our high yesterday being in the mid 70's. I think the chiller will be the only real solution giving where we live and the wife doesn't want the tent moving back into the house. We live in a small house so it is near impossible to hide inside.