Gallagher Aviation has been designated an official dealer for the SwitcheOn remote hangar power control devices.
These boxes provide remote control as a 2 or 4 channel device with 15 or 20 amp versions available.

With an Apple or Android smartphone device, you can remotely control the SwitcheOn power outlets through its app to turn electrical outlets on or off.
This remotely controls the engine or cabin pre-heater for your aircraft, so you no longer have to drive out to the airport the night before to plug your airplane in to fly in the morning, company officials noted.
SwitcheOn comes with the first year of service for free and is then $50 a year after that (renewed in the app).
You can order SwitcheOn at GallagherAviationllc.com/Switcheon. Prices start at $199.
If your hangar/airport has reliable WiFi, smart plugs (a lot less expensive and no recurring charges) work very well, too.