Professor David MacKay

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."