I was originally planning on purchasing a rack but after looking through the forums I have decided to build one instead (that way the money I save can be put into more BP's.I plan to have the rack in my living room since that is where the thermostat is and heat is best regulated in the winter time. In winter the temperature doesn't drop below 70 but in summer it can get to 75-78. My question is due to the 70 degree ambient would back heat or belly heat be better? The first thought was a 6 slot 41qt rack with 11" back heat but now I am leaning a bit towards a rack that can hold 32 and 41qt tubs and for that I was thinking 4" belly heat for the 32's and 11" belly for the 41's. The big questions is would one be better then the other for maintaining cool side temps? Maybe I should consider adding side wall heat on a seperate thermostat to help raise ambient? I am trying to stay away from using an oil type room heater.