[masraum]

Originally Posted by billybek

Heat pumps have come a long way in the last few years in being able to produce useable heat in lower outdoor ambient temperature conditions.
The efficiency suffers as temperatures drop but when you're producing the power yourself, no big deal.
We can see temperatures close to -40 deg (C or F, take your pick...). I will stick to gas.

I'd be completely happy to get a heat pump that worked well down to about 15-20º installed. From what I understand, that shouldn't be an issue these days.