I have had my 40.5 for 2 seasons, purchased new. I have separate A-B 12VDC air-cooled units for the refridgerator and for the freezer. Both units have a heavy 1/2" thick cold plate in each compartment. A few questions for you Phil and everyone else too. 1) I know that I have leaky seals on both the refridgerator and freezer. These are being replaced this spring- (BTW, a great way to find those leaks is with a ultrasonic sound sniffer and a generator on the inside). Given known air leaks, I find that the frost/ice buildup on the refridgerator cold plate is only on the bottom half of the plate. Why not the whole plate and is this normal? After the seals are tight, how much frost buildup should be considered normal? 2) The refridgerator runs at about 35 degrees at a midpoint setting of the thermostat and I find that one of these small battery operated circulation fans seems to help the uniformity of temperature. Is there any down-side to using one of these fans? Without the fan I find that many items freeze next to the cold plate and items far away take a long time to cool. 3) My freezer at full cold setting gets down to about 20 degrees. This is cold enough to keep most foods frozen, especially at the bottom of the freezer, but ice cream just stays soft. Should the freezer run colder? Does ice cream require a lower temperature to stay hard than 20 degrees? 4) I've heard that converting the compressor to water cooling is not energy efficient until the air temperature is above 80 degrees consistantly. True or not?