Wow! that's strange. We never had fires caused by A/C units yet, but I must say there aren't too many set up yet on the buildings. If one would go off, many homes would be destroyed in a house like ours.
Here the main fire cause is the coffee machine, and it usually burns 2-3 flats, and upwards 6-8 others filled with smoke.
http://hampage.hu/trams/vaciutesujpest/10-es/1781-10.jpg
