Heat pumps can dehumidify your home in the summer months. Depending on the construction of your home and your other mechanical systems, your heat pump may (or may not) be able to keep your relative humidity low enough (below 50%) to reduce mold, moisture and pest problems in your home during the summer. This is true for your heat pump hot water heater, too, if you have one. Measures installed through this program are not eligible for any other Efficiency Maine incentives. Program and incentives