Window air conditioners are small units made to fit a standard window space. They work like any other air conditioner and they come in different BTU (British Thermal Units) capacities to cool rooms of different sizes.

Window air conditioners came to the market as a solution for people who couldn't afford or did not want central air conditioning. Because central air conditioning can be quite expensive, and because many people live in small apartments, central air is not for everyone. This led to the advent of window air conditioners.

Window air conditioners have a hot coil and a chilled coil along with two fans. The fans blow air over these coils and they in turn suck away the heat and humidity from the room into the outside area, providing clean, cool air.

The capacity of an air conditioner is measured in BTUs. So, the size of the air conditioner plays a vital role in determining its cooling capacity. When a small window unit for a large room is not enough, a large unit for a small place is waste of money. So, you should buy a window air conditioner appropriately based on your room space. For a space up to 350 square feet, you would require 8000 BTUs. The number of BTUs grows proportionately according to your space.

Window air conditioners have high-energy efficient ratios, noise-free, and when fitted properly cool an entire space very quickly. There are lots of types of window air conditioners from different companies available at different prices. Companies like Haier, Kelon, and Carrier have products starting from price ranges as low as $50-$150. They come with quiet operation function, timer, dehumidification, air filters and much more.

If you spend over $300 on an air conditioner, the quality and value increases dramatically. The air conditioners have a high EER and BTU capacity and are capable of cooling large spaces very quickly. Spend $600 or more and you'll be purchases a super deluxe model that will probably cool your entire first floor living area.