We haven't experienced that yet. I think the lowest temperature we experienced since it was installed was -4 F one night. We didn't notice any problems. The

We haven't experienced that yet. I think the lowest temperature we experienced since it was installed was -4 F one night. We didn't notice any problems. The only issue I've seen is the large buildup of ice below the outside unit. The unit is elevated on legs for just this reason so it hasn't affected its operation. The ice is formed when the outside unit goes through its defrost cycle in cold weather; water dripping off freezes when it hits the ground.