What temperature is a heat pump not effective?

What temperature is a heat pump not effective?

Heat pumps rely on heat within outdoor air to keep your home at comfortable temperatures during winter. Heat pumps are rated for efficient operation within a certain temperature range. The optimal temperature range for conventional air source heat pump operation is above 25 to 30 degrees Fahrenheit. The heat pump begins to lose efficiency once temperatures dip to 40 degrees and is no longer the most efficient heating option once temperatures fall to 25 to 30 degrees. A backup heating system is a smart option that ensures efficient, consistent warmth in the home all winter long.
With a backup heating source installed, your system automatically switches from heat pump heating to backup. Allowing your backup system to run as the home’s primary heat source significantly raises the price of heating. Do not manually switch between heating sources at your thermostat.

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