[looofooo0]

These home will most likely have a split air con, which will be the most efficient way of heating them. Also there is so much other room for improvement like drafty windows and doors etc.

[walrus01]

In many warmer climates, the mini split air conditioners sold are cooling capability only. This is much cheaper to purchase for a 12,000 up to 24,000 btu/h unit than one which is also capable of heating the interior.

[looofooo0]

Not true, I can buy a Chinese 4kw Model for 650€ which can heat till -15degree. Doubt that you can save much.

[walrus01]

Go price air conditioners in the uae or Kuwait or similar, the cooling only models are very much a thing that exists on the market.

[looofooo0]

But not in Europe. It is only one 4 way valve extra to enable heating.