During the heating season, my heat pump makes a “whooshing” sound and I feel cool air coming from the supply registers. Is that normal?

Don’t worry the “whooshing” sound is completely normal. During the cold weather months, frost can accumulate on the outdoor coil. This can cause the heat pump to go into a defrost cycle anywhere from 1-10 minutes, depending on the amount of ice on the coil. This is temporary; the system will return to the heating mode once the ice is gone.
For more information contact McDonald Plumbing, Heating and Air at (916) 233-4194.

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