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ResponsibleExcuse727 t1_j733ukb wrote

I believe the rule is they become less cost efficient at 20 or below.

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Pen_Active t1_j73svzr wrote

This will vary dramatically on the model. Most run at 100% efficiency down to around 20f. Cold-climate models will maintain their cost efficiency compared to oil, LNG, or LP to below 0f and operate below -20f when needed.

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