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by bkor 1188 days ago
> The heat pumps I have seen personally in Europe are geothermal, very big, and very expensive.

In NL I saw loads of water/water heat pumps (so using geothermal) in plans for new buildings. The latest plans now seem to prefer air/water. The air/water is cheaper and the units nowadays are much quieter than they used to be. This is just my observations, I could be way off.