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How many rooms do you want to have air con in?
You will have to live with a wall mounted evaporator unit in each room. The more rooms the bigger the outside condenser unit you will need.
They aren't maintenance free either. The evaporator and condenser need cleaning and making sure the water pumps are working. Modern gas is a lot more environmental friendly but the CO2 cost to a leak can be frightening. You have to be qualified to maintain them as well so it's not a DIY job and you can't fit them yourself.
If you are rich and want a cold and hot house they are great. If you want to save money then it's not a place you want to go to.
To qualify. I test air con as part of my job.
Anyone have any recommendations for Air Conditioners? The heavy duty exhaust vented type. Aka a heat pump
Have a feeling we could be indoors a lot this summer...