[dkjaudyeqooe]

I run a building with 5 apartments with central water based wood fire heating, ie a furnace and radiators in various rooms. It's brick construction with no insulation. It's absolutely stupidly constructed.

The central heating is still there and used sometimes, but I installed mini-split reverse cycle air conditioners in each apartment and they work great, you just have to size them (power wise) correctly. They were 550-700 euros each installed. It's much much cheaper to pay for electricity than the equivalent amount of wood, even after the cost of the units. There are various additional benefits like being able to use the aircons when it's briefly cold, or you just want to warm up the space a bit. You also get cooling for no additional charge of course.

Mini split systems are not always the best solution, but they are another useful option to be weighed against larger central heat pump systems. All depends on the situation, but heat pumps are the present and future, nothing else makes sense.