I tried the fridge thing and it never kept my rez cool enough. It ran all the time and eventually the compressor quit. After wasting 2 weeks of my time I broke down and bought a chiller. I found one on craigslist. Someone was selling a complete aqaurium with chiller for $200, problem solved. I didnt realize it at the time but I have since used almost everyting else that came with the aqaurium (minus the filters) Best $200 I have spent. I dont know what kind of system you have but if you have an inline pump you can put a fan directly on it. I found that was where alot of my heat was coming from. It was not a drastic improvement but it lowered my rez temps 2 or 3 degrees.