Learn About Window Air Conditioners

A matter of life and death
Modern air conditioners provide cool and dehumidified air in automobiles and buildings. First invented and patented in 1902 by Willis Haviland Carrier, the electrical air conditioner is a standard appliance that folks in many regions regard as essential. Many of us can't imagine going a whole summer without the cool comfort it provides for our homes and workplaces. For many asthmatic, elderly, and critically ill patients, a properly functioning A.C. unit is a matter of life and death.

Window air conditioners are compact A.C. units designed to be mounted in a window or wall, and are used to cool one or two rooms. These models operate on exactly the same principles as central air units, but are less expensive and more convenient for small rooms and apartments. Most units are designed for do-it-yourself window installation, however, installing through-the-wall models requires some carpentry know-how.

How to choose the right size
When it comes to purchasing the right window unit for your home or office, the most important considerations are climate and room size. To determine the proper size, measure the square footage of the area you want to cool. Add extra capacity for hotter environments such as kitchens and high-traffic areas where the door is frequently opening and closing.

The size of air conditioners is rated by BTU (British thermal unit). A higher BTU means a more powerful air conditioner. The following conversions will give you an idea of how BTUs translate into cooling capacity:

• 5,000 to 6,000 BTU - up to 300 square feet
• 7,000 to 8,200 BTU - up to 550 square feet
• 9,800 to 12,500 BTU - up to 12,500 square feet

When sizing your window air conditioner, it's also important to consider that a 12,000 BTU unit will be much larger and heavier than a 5000 BTU unit. Remember to inquire at the time of purchase whether the retailer provides installation service. If not, make sure to seek assistance before attempting to mount heavier models.