On 5/7/2018 10:08 AM, Jimmy Wilkinson Knife wrote:


Why on earth could an AC unit not run backwards?* You just reverse the
pump.* Every one I've seen in the UK (commercial and home) has been able
to do this.* The controller usually has settings for heating, cooling,
or automatic.* On automatic you can simply set a range (say 18 - 22C)
and if it goes over, it cools, if it goes under, it heats.


For most of us, no need. We only use cooling here for two months. We
have very efficient central heat and the AC goes into a window in the
summer for cooling only. It can also get very cold here.

In more mild areas, central AC with heat pump is common and works well.