![]() Windows add 1,000 BTU and kitchens can add up to 1,200. This structure will need 288,000 BTUs for effective cooling.įinally, you need to consider variables that can impact the heat level within the building. Next, multiply that number by 12,000, determining how many BTUs you’ll need to cool the space before considering any other variables. Using our example building leaves us with 12,000/500 = 24. Once you have the total square footage for the entire building or the space you’re trying to cool, divide that number by 500. For argument’s sake, we will use a 12,000-square-foot office building as an example. If yours is taller or you have vaulted architecture, you’ll need to adjust your estimates accordingly. This calculation is designed for buildings with standard 8-foot ceilings. Choosing the correct HVAC unit requires more calculations, especially for businesses.ĭetermining the ideal HVAC system size starts with the square footage of the space you’re trying to cool. Still, you may also wish to consider the aesthetics of the installation. Integrating the device seamlessly into the space isn’t as important in commercial designs as in residential ones. Selecting an HVAC unit that’s too large for a given area will waste energy and cost more in the long run. An air conditioner is rated in tons, ranging from small half-ton machines to 30 tons and up for large commercial spaces.īigger isn’t always better. The heat an HVAC system can remove is measured in British thermal units (BTUs). Choosing a properly sized HVAC system starts with understanding how these devices are rated.
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