A useful technology will surely be long-term thermal storage.
An objection to heat pumps is “oh, we can’t approve of people fitting efficient air-source heaters,
because they might use them for air- conditioning in the summer.” Come on – I hate gratuitous
air-conditioning as much as anyone, but these heat pumps are four times more efficient than any other
winter heating method! Show me a better choice. Wood pellets? Sure, a few wood-scavengers can burn wood.
But there is not enough wood for everyone to do so.
For forest-dwellers, there’s wood. For everyone else, there’s heat pumps."