Originally Posted by videoman5
Not to threadjack, but I was considering other household liquids as a substitute to water; Namely Isopropyl Alcohol and Hydrogen Peroxide. Both have lower freezing points, but I know nothing of their conductivity of heat. I ask this because I am contemplating making a loop that has a reservoir outside in the winter and harnesses Old Man Winter for more Mhz.
If you keep your computer running constantly, you won't have a problem with water cooling outside. If you let the flow and heat source stop, then you will get freezing in the loop, and you would have to bring everything inside to let it thaw.
Your other concern with using the winter to cool would be condensation. The forums on peltier devices and phase change rigs should have some good info on preventing condensation.