For those who have a dorm-type refrigerator in a cold hangar, here’s a way to make it useful in the sub-freezing weather.
I went to Lowe’s and purchased a small lamp bulb holder, attached it to a box, wired it with a short cord, and hung it from the upper shelf in the refrigerator. (Alternatively, a small lamp would do.) Put in a 40 watt long-life bulb.
To the end of the cord, I attached a “thermo-cube” (available from Sporty’s at $15 or so). The thermo cube is normally used to turn a Tannis-type heater on and off, and goes on at 35 degrees and off at 45 degrees. (Perfect!)
From the thermo cube, ran an ordinary outlet, with the thermo cube inside the refrigerator.
At 35 degrees, the lightbulb (aka heater) goes on, and it goes off at 45 degrees. Perfect for a Coke, bottled water, or cleaning fluids and polishes that can’t freeze.
To be safe, I installed one of those indoor/outdoor termometers, with minimum and maximum temperature, and put the “outside” probe inside the refrigerator. This not only helps make sure all is doing what it’s supposed to, but can be used to figure out the right size bulb for an individual situation.
My contribution to aviation science. If it burns your hangar down, you’re on your own.