I’m an hvac system designer in Vancouver, Wash., just across the Columbia River from Portland, Ore. We install a wide variety of heating and air-conditioning systems, but in recent years our best-selling products have been super-efficient small-to-medium-sized ductless heat pumps (DHP), most of which are retrofitted into existing homes.That trend has been helped along by now-expired federal and state tax credits and an ongoing rebate program sponsored by the Northwest Energy Efficiency Alliance, or NEEA. The NW Ductless Heat Pump Project, as it’s called, helps eligible homeowners cover the cost of converting from existing electric resistance heat — which the...

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