[jakedata]

This is why I couple my heat pump operation to solar output from my panels. Any time I can fully self power it is a 100% win. During the darkest and coldest months however, the existing gas boiler takes the lead.

My heat pump is 5 years old and has never leaked refrigerant. I also collect the condensate for the gardens.

[osigurdson]

>> During the darkest and coldest months however...

How cold are the coldest months?

[jakedata]

http://www.worldclimate.com/climate/us/massachusetts/framing...

The averages do not illustrate the extremes very well, we see many days where the nighttime temperatures never rise above 0F.