Many manufacturers can run down to zero F. Use this, and the attached slides show heat pump performance at 47F, 17F, and 0F. Note the diminished capacity and COP at lower ambients.
The Heating Seasonal Performance Factor (HSPF) is a measure used to gauge the efficiency of heat pumps. It represents the total heating output of a heat pump (including supplementary electric heat) during the regular heating season, compared to the total electricity consumed during the same period.
Think of HSPF as SEER for the heating mode.
Definition and Calculation:
HSPF is calculated by taking the total heating required in British Thermal Units (BTUs) over the heating season and dividing it by the total electricity consumed in watt-hours during the same period.
This measures the efficiency of the heat pump's conversion of electrical energy into thermal energy for heating.
Units:
HSPF is measured in BTUs per watt-hour. Higher HSPF ratings indicate a more efficient heat pump, meaning it uses less electricity to produce the same amount of heat than units with lower HSPF ratings.
Standards and Relevance:
The HSPF rating is critical in colder climates where heating needs are higher. A higher HSPF rating indicates a system's efficiency in converting electricity into heating over an entire heating season.
Comparisons and Usage:
When comparing heat pumps, a higher HSPF rating usually signifies better energy efficiency, which can lead to lower utility bills during the heating season.
Energy efficiency incentives or rebates may be available for heat pumps with high HSPF ratings, promoting energy savings and environmental benefits.
In essence, HSPF is a critical factor when considering the purchase of a heat pump, as it affects both the environmental impact and the operational cost of heating a home.
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