Ductless Cold Climate Heat Pumps for Multifamily Applications

Update: January 2023

The project team has completed installation of ccASHPs at almost all test sites and collected data through a partial heating season. From the initial results, the team concluded that the ccASHPs could have operated more efficiently and they are in the process of further optimizing installations and collecting and processing data on those updates. Project timelines have been extended and the team expects to summarize the test site data for a final presentation and report in 2023.

Overview

The 2018 CARD Minnesota Energy Efficiency Potential Study identified cold climate air source heat pumps (ccASHPs) as the technology expected to provide 25% of total residential electrical savings in the state in the coming decade. This will be an essential component in meeting Minnesota’s 1.5% conservation goal.

Within the past year several Minnesota electric utilities have modified their existing heat pump programs or undertaken ccASHP pilots to increase installations. However, installations have been slow to date due to lack of familiarity with this technology on the part of Minnesota contractors and consumers. Most ccASHP research and programs have been designed to characterize and impact the single-family market. This project will focus on the outstanding questions and modifications needed for applications in the multifamily sector.

 This project will engage stakeholders and screen multifamily buildings to understand the range of building and heating and cooling system features that will impact heat pump performance. ccASHP system type selection, sizing, configuration, and control guidance will be developed and used alongside existing industry installation and monitoring best practices in up to 20 multifamily test units. Analysis will be conducted to determine typical statewide performance, energy and carbon savings, cost effectiveness, and the overall potential to assist in reaching conservation improvement goals.