- Ground-Source Heat Pumps - Air-Source Heat Pumps: Cost Less & Smaller
A well-designed heat pump system will hardly heat the house on the coldest day of the year. The system may even be sized to handle less than the intended heat load if the system designer is willing to rely on electric resistance heat during severely cold weather.
Sections 1401 and 1403 of the 2006 IRC are the main sections that deal with heat pumps. Equipment should be sized using ACCA Manual J or another recognized calculating technique (1401.3).
Although heat pump manufacturers advertise incredibly high efficiency, reliable monitoring information is unavailable on completed homes with ground-source heat pumps.