MHDB7110U1000, Honeywell,

Honeywell’s Universal Heat Pump Defrost Control helps keep the heat on during cold winter months. With a small footprint designed to be quickly installed in the tightest spaces, you’ll be on to the next job in no time. And best of all, it’s universal — stock one part to cover a wide range of single-stage heat pump applications. Your customers will love it, too, with a demand defrost algorithm that only defrosts when necessary, saving them money.