When converting from forced-air systems (electric, gas, or oil)
to a heat pump, proper design is still important. The existing ductwork is
probably adequate for the existing system, but may be undersized for a heat
pump. In some situations it's best to remove the old system, including
ductwork. Then a properly designed heat pump, including ductwork, can be
installed. If the existing ductwork is adequate for airflow with the
properly-sized heat pump, then duct sealing using a blower door pressure test
and mastic sealant for the leaky spots is recommended. To allow your heat pump to operate at its maximum efficiency,
your home should be adequately weatherized prior to the design of the heat pump
system. Contact your electric utility for information on home weatherization
including:
