We have been told by the Air-Conditioning Engineers that the problem with holiday homes is the Air conditioning is not run regularly, only when the visitors are over, air con needs to be run regularly as it can get bunged up, and also develop other problems. The one we have in the living room when turned on had water running down the wall, so a wire was run through and it cleaned it out, turned out there were insects inside it. We now get our Maintenance people to run the Air Conditioning for us every two weeks when they come over to check the place.