We used to get -30C regularly. I remember one winter in 93 or 94 where it was -25C steady for almost 6 weeks. Every heating guy and plumber was working flat out fixing frozen and broken water lines and heating pipes.
Those days are gone. The last few years we have seldom had temps much below -15C with some -20C at night, but not many.
New technology is allowing ASHP to get lower and lower in ambient temp and having a gas or electric back up can still make financial sense. It might be the choice between $40k for vertical wells and $20k for an ASHP with some solar (for example) and if the annual heating cost is less than $1000with GSHP and $1200 with ASHP, is it worth it to go GS?
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