A homeowner took to Reddit to get advice about their heat pump's functional ability in extremely low temperatures.
Posting in the r/HeatPumps subreddit, they explained their confusion about their heat pump continuing to pump out heat beyond the low temperatures it's rated for.
"I'm confused, my Mitsubishi is rated at -15°C (5 degrees Fahrenheit) to -20°C (-4 Fahrenheit) but it's still pumping out really hot air at -25°C (-13 Fahrenheit)," they said. "I keep reading it stops heating at those temps.
"For reference, it's always running in heating mode at around 23°C (73 Fahrenheit), a bit less when I leave the house. To my knowledge it doesn't have an auxiliary mode. … Consumption is around 2 kWh including a convection wall heater for sleeping hours. Is it still efficient to run it like that or am I completely missing something lol?"
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Commenters on this Redditor's case were quick to offer advice.
"My understanding of how that works is that the efficiency slowly tapers off past a certain temperature instead of the heat pump just turning off," said one.
"It's efficient," said another. "Even if it's on 100% of the time it's doing its job. Note that ice/rain/snow can lower the efficiency but otherwise you want to set the lockout as low as it will go and still hit your target temperature without it turning on auxiliary."
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