Airtherm Parts | OEM Fan Coil & Unit Heater Components by Mestek

We stock genuine Airtherm OEM parts for fan coils and unit heaters, including models like Unitaire IV and Unitaire 5, whether horizontal or vertical, water or steam. As a Mestek brand proudly made in the USA, Airtherm equipment is built to last—and we carry the parts to keep it running. Shop aquastats, overflow switches, drain pans, blower wheels, PSC & ECM motors, fan speed control switches, thermostats, replacement coils, complete units, and more.

Don’t see your part number? Our inventory is expanding! Email us or call us to confirm fitment using your model and serial number.