woodenspoon
People we know who have heat pumps are either delighted with them or others claim there’s are always going wrong. I guess like everything it depends on the brand.
With ours we were in the first category for the first twelve years, then the second for the last three years of its life.
To be honest, although in our case the energy saving was great, part of that saving is due to the extra insulation that was put in prior to installation of the heating system, and I'm not sure the overall saving was very big once the cost of instalation, annual servicing and repair bills are taken into account.
In our case, we rent and didn't have to pay for any of those 'extras' ourselves, but for those who do, it is questionable whether it is worth doing simply to save money.
As for whether heat pumps are less damaging to the environment than the alternative forms of heating, I have no idea. There are so many factors to take into account, and each type of heating will have its own positives and negatives.