User Manual Heat Storm HS-1000-WX-WIFI - 1000 Watt Wall Mount WiFi Enabled Infrared Heater

This heater heats: as primary heat up to 200 sq ft as secondary heat up to 750 sq ft

The fan does stop running once the desired temperature is reached and when the infrared bulb has cooled down. It cools the bulb to extend the life of the electronics of the heater as well as make the heater safer to run unsupervised.

The thermostat can range from 16°F to 99°F.
The lowest temperature setting is 40 degrees and the highest is 99 degrees.

This mean adding a second unit would cover more range so if a hs-1000-wx cover 200 sq feet if you add another heater the heat range increases to 800 sq ft