Four-year testing finds heat pumps run efficiently even in older homes

Researchers at Fraunhofer ISE have tested various types of heat pumps in existing buildings across Germany over four years, finding that the systems achieved seasonal performance factors between 2.6 and 5.4. The team also showed that PV-driven heat pumps can boost self-consumption rates, particularly when paired with battery storage.Germany's Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE) this week presented the results of a four-year study on the performance of various heat pump systems installed in existing residential buildings across the country. In total, the institute's ...

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