[ansel12]

There are a couple of different makers of these type sensors.

Farm Innovators TC-3 Cold Weather Thermo Cube Thermostatically Controlled Outlet - On at 35-Degrees/Off at 45-Degrees

http://www.amazon.com/dp/B0006U2HD2/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2EPW9ISNDNSOJ&coliid=I1GUXEMI65CJL5&psc=1

[OneWingedShark]

Thanks for the link.

[familyop]

That thermostat outlet is pretty neat. ;-)