Homeowners can also opt for renewable energy sources to power the heat pump, such as solar panels, further minimizing environmental impact [see house photo on previous page ]. There are federal and state rebates and tax incentives for installing energy-efficient heat pumps.
In newer, air-tight buildings, ventilation is essential to pre vent mold growth and maintain indoor air quality. HRV (heat recovery ventilator) and ERV (energy recovery ventilator) are both ventilation systems designed to improve indoor air quality by exchanging stale indoor air with fresh outdoor air. However, they differ in how they handle heat and moisture.
HRV (Heat Recovery Ventilator): Incoming cold fresh air is tempered by warm, exiting air; there is no moisture transferred. It is best for colder climates where retaining heat is important but humidity control is not a major concern.
ERV (Energy Recovery Ventilator): This system transfers both heat and moisture between air streams, helping to balance humidity levels. It is ideal for climates with extreme temperatures and humidity (either very humid or very dry).
There are two options for installing ventilation—the differ ence being how air is distributed. With a stand-alone system, the ventilation uses separate ductwork for distribution. Since the tubing is generally much smaller than required for heating and cooling, this is a great option for homes without other ductwork or difficult-to-access spaces due to design or construction constraints. The alternative is to interlock an HRV or ERV with the fan used for heating and cooling and utilize the ductwork of that system for distribution. Typically, the ventilation system would be set to run for 15 to 20 minutes per hour, but it can be programmed to run more or less as needed. Interlocking ventilation with the heating/cooling system saves money solely by utilizing the ductwork system already in place. A high performance, energy efficient home will provide long-term benefits to the homeowner (higher comfort level and lower operating costs) for only a small premium (0-5%) over a standard new home, built to current codes. The environment also benefits as fewer natural resources are consumed and less fossil fuel is used for heating and cooling. Creating such a home is not rocket science but it requires careful planning upfront and attention to detail during construction.
Architect John Cole of Fryeburg and builder Anthony Giovanni, owner of MWV Fine Homes in Intervale, collaborate on high performance, energy efficient homes in the Mt. Washington Valley and western Maine, including the winner of New Hampshire Home Magazine’s, Excellence in Green Design Award.
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