I am having the same problem. When the temperature goes down to below -5C I get a boot error, which I assume is from the hdd not spinning up quick enough. After about 5 min if I restart it boots normally. Today I grabbed the heater out of a surveillance camera enclosure and am planning on putting it in on Sunday. These heaters are quite small and should fit into the case relatively easily. The heater is supposed to have temperature sensors to tell it to turn on & off. My plan is to wire it up so that it comes on when I use my remote starter to warm up the car for 5-10min prior to the carputer booting. I will let you guys know how it works out. Its supposed to get to -31C on Sunday night.