hirsutesuit t1_iqr0ac2 wrote
Reply to comment by Direct_Rabbit_5389 in Shocked by gas bills, thrifty Dutch stockpile coal, wood for winter by clampie
Mine is still 100%+ efficient at -22F (-30C).
Direct_Rabbit_5389 t1_iqx55cf wrote
100% efficiency is a given -- resistive heating is 100% efficient due to the first law of thermodynamics. The important cutoff is when the heat pump becomes less than 400% efficient, or when the heat pump becomes less financially efficient than a gas furnace.
hirsutesuit t1_iqxpfjl wrote
No, it's not. The percentage would be different for everyone - and it could change everyday.
If you don't want to set things in fire in order to keep your house warm then anything more efficient than resistive heating is good.
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