HVAC Load Calculation Explained

October 21, 2019

Buying an AC/heating system sized on a hunch can end up costing a lot of money in wasted energy, repair bills and/or a sooner-than-expected need for replacement. Decisions regarding heating and cooling equipment size should be made based on the interior size of the area to be heated and cooled. Load calculation is the way to determine the size of the HVAC system necessary to properly heat and cool your living space with maximum efficiency. Understanding Heat Load The first variable in calculating and properly sizing an HVAC system is heat load. Heat load is the sum of all sources that cause a room or building to heat up. It is expressed in BTU (British Thermal Units) or kW (Kilowatts). In other words, it is the sum of all factors that contribute to the space heating up, which you will need to account for with your AC/heating system. These heat sources include, but are not limited to, sun exposure; kitchen appliances such as ovens and refrigerators; office appliances; other household machinery; lighting and heat that enters through windows; doors and air leaks. Heat load even includes the warmth produced by your body and those of all other occupants. How Does...

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