Empire Comfort Systems TRW Mantis FF28 Wireless Remote Wall Thermostat

Purchased from another web outlet. The unit temperature calibration is off four (4) degrees lower than actual temperature. The manufactures customer service told us it can't be adjusted. The temperature range operated is in plus two up and down two degrees from the setting (also a four degree range). The programing of the unit does not follow my simple logic; maybe it would for you. I think I'm learning the steps. I appears to be working as it was designed (poorly for a thermostat as I see it).No I cannot recommend this piece of equipment as a marketable item. It is a poor substitute for a thermostat or a room thermometer. .