Room Size / BTU Calculator Based on our years of experience, Aircon Experts simplified the technique of calculating the perfect air-conditioner size (Better known as BTU size) required for all rooms and offices. Purchasing our top quality products, with the perfect sized air-conditioner, is as a long term investment. Aircon Experts considered most heating and cooling elements that can influence the performance of our top quality air-conditioners and therefore guarantee adjustable comfort with the press of a button, for years to come... Room / Office Size: Room / Office Lenght: Room / Office Width: Room / Office Height: Fixed at 3 meters Room / Office Characteristics: Please select ONE element of the room / office to consider when calculating the perfect sized air-conditioner: Large or oversized windows with direct sunlight Wide open spaces to other rooms, offices or bathroom Floor to Ceiling height more than 3 meters Extremely hot/cold in season