Harlan, when I installed an engine heater last year, I ordered a SwitcheOn remote system. Pretty neat really. It uses Verizon to connect with your phone so you may turn on and off your heater from anywhere in the country. I kept my Kitfox in Sedona,AZ
17 miles from my home and just hit a button on the app to start my engine heater but you can also schedule time of day to start the heater or program it for a specific temperature in your hangar say anything under 50 degrees and it tuns on automatically. It also tuns off at a preset temp if your hangar warms up to the set temp. The app also shows you on your phone the current temp inside your hangar. I purchased the two item controller but they have also a four item controller for more coin.
Price for the unit also includes a $50.00 a first year fee for the Verizon connection. Check it out.
https://switcheon.com/power-switch/
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