Put it on a thermostat and set it to 40ish degrees. If you need help in doing so an HVAC or decent electrician can help, or I can walk you through it if you feel comfortable doing the work. All you need is a line voltage thermostat, typically used for baseboard electric heaters.
https://www.homedepot.com/p/KING-Line-Voltage-Double-Pole-Mechanical-Bi-Metal-Thermostat-in-White-K102/307675482
EDIT: Just make sure in the specs it can handle the wattage, current and voltage.
EDIT2: You can make it work on any thermostat, just requires some extra parts and wiring.