How often should AC defrost?
How often should AC defrost? approximately every 40 minutes There are timers built into the computer control of the system that restrict how often defrosting can occur. Generally, a unit must run for a minimum of about 35 minutes after starting up before completing its first defrost. From there, defrosts should occur no more often than approximately every 40 minutes. What does a defrost control board do? Your defrost control board is responsible for defrosting your outdoor heat pump unit. When cold air strikes, ice builds up on your heat pump's outdoor unit. Your defrost control board is responsible for...