Kyrie Saperstein

Selecting a properly sized cooling system is essential for comfort and efficiency.

If you buy an undersized air conditioner, the equipment may fail to keep up with cooling demand on hot, humid summer afternoons, even when running nonstop. This also increases your energy bills, despite your efforts to save money by purchasing a smaller system

On the other hand, if you buy an oversized air conditioner, it will reach the target temperature too quickly. This short-cycling behavior increases wear and tear, leading to premature breakdowns. Cycling on and off frequently also makes it impossible for the AC to adequately dehumidify your home, leaving you feeling cool but clammy.

The cooling capacity of an air conditioner is measured in British thermal units (Btu). One Btu is about the amount of heat generated by a birthday candle. You’ll find window units with cooling capacities ranging from about 5,000 to 12,500 Btu, which indicates the amount of heat the unit can remove from a room per hour.

Central air conditioners are much larger, so they’re measured in tons, which is equivalent to 12,000 Btu. Most residential units range from 1.5 to 5 tons, or 18,000 to 60,000 Btu.

If you’ve ever wondered what size central air unit you need, or how to size a window AC unit, be aware that square footage is the number-one factor. Indeed, it’s often the only factor listed in rule-of-thumb guides. On average, an air conditioner needs 20 Btu of cooling power per square foot of living space. However, smaller areas tend to require more than 20 Btu per square foot, while larger rooms need less than 20 Btu per square foot.

But square footage is far from the only consideration you should make. These additional factors also affect what size central air or window unit you need:

The principles in this guide are merely rule-of-thumb estimates. To get the most accurately sized AC unit, you need to hire a professional. Cooling experts use Manual J, the industry standard for sizing HVAC systems established by the Air Conditioning Contractors of America (ACCA). This takes all of the factors outlined above and determines how they affect your home’s overall cooling load to calculate the ideal AC unit size.

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Description Fulton John Sheen was an American bishop of the Catholic Church known for his preaching and especially his work on television and radio. Ordained a priest of the Diocese of Peoria in 1919, Sheen quickly became a renowned theologian, earning the Cardinal Mercier Prize for International Philosophy in 1923. Wikipedia