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Precooling is an operational strategy that cools occupied spaces earlier in the day to minimize or avoid afternoon air conditioner operation.

The purpose of this research is to investigate the impact of ducted heat pump water heaters on space conditioning and water heating energy use.

A new generation of central, ducted variable-capacity heat pump systems has come on the market, promising very high cooling and heating efficiency.

This study tests the performance of a variable airflow small-diameter duct HVAC system in a new construction low-load test house in Pennsylvania.

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