Window air conditioners, as well as central air conditioners, catch fire due to the ignition of an electrical wire. Power cables used should be in good condition. The main causes are the 1. Electrical cables of window air conditioner 2. Extension cords 3. Overtaxed home electrical wiring According to the survey, the report has been published that revealed that 1% of fire ignition in houses is due to catching of fire by air conditioners. The number is small but is still a disturbing factor for the manufactures. You can prevent it by keeping away your air conditioner from flammable objects. And improper maintenance and load usually lead them to catch fire.