The Northwest Energy Efficiency Alliance (NEEA) contracted with Ecotope, Inc. to review recent updates to the methodology of the Alliance Cost Effectiveness (ACE) model for its Heat Pump Water Heater (HPWH) program, specifically regarding updated assumptions for HPWH installations in new construction. Report focus areas included:
Findings from the review support the use of the 2019-2020 Washington Residential NCCS for updated estimates for Washington’s new homes market. In addition, findings support NEEA’s use and approach of baseline-adjusted Regional Technical Forum (RTF) measure values and weighting methodology to arrive at a regional average value and costs/ savings assumptions.