Heat pumps are efficient, but they are also very much climate-dependent. When it comes to moisture control, sizing the heat pump correctly is the most effective step an HVAC contractor can take. Some contractors try to oversize the heat pump to gain heating performance. However, Corey Hickman, owner of Comfort Matters Heating, Cooling & Plumbing, in Maple Grove, Minnesota, said this can really limit their ability to dehumidify. Systems, on average, are designed for 70% sensible heat removal and 30% latent heat removal. An air conditioner needs to run 15-20 minutes before its latent capacity starts to remove humidity from the air. So when in doubt, aim for longer run times, advises Nick Bender, at Minneapolis St. Paul Plumbing, Heating, Air.

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