Ductless Heat Pumps, commonly referred to as "DHPs" or "mini-splits", are becoming more common in the Northwest for both retrofits and new construction. This measure, specific to single-family residential new construction, applies to Oregon, Idaho, and Montana.
For Idaho and Montana, the measure requires an HSPF 10 or greater DHP be installed in the main living area of a new single-family home. The current unit energy savings assume a "single-head" DHP (with supplemental zonal electric resistance heat), but "multi-head" systems are also allowed.
For Oregon, the measure requires an HSPF 10 or greater DHP in addition to a high efficiency water heater that complies with Conservation Measure Option D of the 2017 Oregon Residential Specialty Code. Current Oregon code requires builders to select ONE Conservation Measure from a list in order to meet the energy efficiency code. Both DHPs and high efficiency water heaters are on the Conservation Measure list; therefore, this measure requires that BOTH these measures be installed in order to ensure that the home exceeds minimum energy efficiency code requirements.
All measure applications are currently considered Planning due to outstanding research questions on:
- In-situ energy savings of DHPs in single-family new construction; and
- Rates at which DHPs, high efficiency water heaters, and other technologies are used to meet or exceed Northwest building codes.
Related Subcommittee: Ductless Heat Pumps for New Construction Subcommittee