Ok apologies if this has been covered elsewhere, but we all know how bad the search option is on these forums So it is summer (boo) and grow rooms start to get warmer. The problem i have is i am now pumping warmer than normal air into my res tank, which of course warms the soup to the same temp over time. This is bad. Less DO, 23-24 degree water not exactly good for the roots, you see my problem. Water chillers are bloody expensive, £400-600 which is out of the question. I need my air pump to be somewhere cold and there is nowhere in the place i can put it. So i thought...what about a mini fridge? Air line is fairly thin and if i get one with a flexible seal around the door, i should, in theory, be able to stick my little air pump in the fridge, have the air line running out the seal in the door and have a small tube for new air to get in the fridge wedged in the door, so the tiny amount of negative pressure i get inside the fridge from the pump will draw in air from the room which the fridge will then chill before being pumped into the res. Has anyone done this? Will i break my fridge by not having it properly sealed and stressing the elements? Or should it be fine for this tiny tiny amount of air being flowed through it? I would love to hear what you guys think and also what you have done to maintain water temps. I don't want anything else going in the res if i can help it, already have 2 air stones and the submersible pump in there, so its getting a bit busy. I am using a Wilma 8 pot so you guys with the same know how small the access is at the front. Thanks guys. After ordering my 7 stage RO system this is my last hurdle.