I just wanted to say i have a heat pump and have only had it for one year and it is FANTASTIC, but then i live in NZ, the temps in my city rarely get below -1 and it works at minus 15, well so it says.

I have never been so warm and comfortable in my home ever, i have a small home, but we installed a bigger pump to help with upstairs heating, it takes the chill off the bedrooms and it can be even quite warm at times, i used to sit on my computer in the bedroom and by the time i left my hands were frozen,not any more.

With all my aches and pains, the heat pump has been a godsend, i absolutely LOVE LOVE LOVE my heat pump.

However i have heard they do not operate well in very cold temperatures and if you live within 1km of the sea, you can expect them to erode and rust and that will not be covered by the warranty.

A big mistake a lot of people make is not installing one that is big enough, and it has to work so much harder to maintain the heat and probably won't ever do a great job.

For North Island climates in NZ, they are perfect.

I have heard of an electric heating called NOBO, we have them here and they are used in Norway, and work very well.

Anyhow hope you are happy with your decision, seems like the right one to me.