![]() Add another one or two BTUs if you have a vaulted or high ceiling exceeding 9 feet. Ceiling height: AC size calculations are generally designed for ceilings that are 9 feet tall, which is the average for homes built today. ![]() The following factors can vary the numbers slightly: Square footage isn’t the only thing that affects AC unit size. A unit that’s too large for your home will cool the space too quickly without removing enough humidity from the air, making the atmosphere too cold and clammy and potentially causing mold. Operating in quick jolts instead of a steady pace causes unit stress. It will turn on briefly to cool the space, then back off when the temperature is quickly reached. The unit will run constantly to keep up with cooling the space, which wears out your system and increases your energy bills.Ī unit that’s too big will also wear down quicker because it will frequently turn on and off. The overall temperature will likely be uncomfortable in warmer seasons, and some rooms may be much hotter than others depending on your home’s ductwork. An air conditioner that’s too small will struggle to cool your entire home. ![]() Why Does AC Size Matter?ĪC size matters for a few reasons. Put another way, an air conditioner needs 20 BTU to control each square foot of living space. One ton of air conditioning removes 12,000 BTUs of heat per hour. ![]() Air conditioners are measured in British thermal units (BTUs) or British thermal units per Hour (BTUh). Air conditioner size doesn’t refer to the unit’s measurements, but rather its cooling capacity. ![]()
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