160 ft²

Make sure this fits by entering your model number.
Smart Thermostat: First, upgrade the app to 4.6.0 and above. Once you connect the heater to Wi-Fi, unplug it, plug it back in, and wait 20 mins. The thermometer bind option will appear on the control page. Now, pair the thermometer with the heater.
Supported Govee Thermo-Hygrometer Models: H5174、H5075、H5179、H5100、H5074、H5102、H5051、H5052、H5071、H5072、H5101、H5177、B5178. Recommended for use in a 160 square feet room. Note: Thermo-Hygrometer is not included.