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## How to Appropriately Size A New Air Conditioner

When it’s time to replace an existing air conditioner or install a new air conditioning system in a new home, you need to know what size will cool your home properly. If your air conditioner is over powered it can freeze and if it is under powered you may be paying more than you should for your AC unit. When you buy a new unit from a manufacturer or home contractor, the tool comes with a ‘rule of thumb’ to calculate the size of air conditioner needed by the building (home or office) you are trying to cool. . Btu calculation formulas are based on recommended coefficients for different building types and conditions. Ultimately, the responsibility rests with the equipment purchaser to properly calculate the cooling load.

The problem with using a rule-of-thumb chart is that the results are not accurate. In other words, the results represent an estimate of the average. There is always a risk of over- or under-estimating the air conditioner you buy. Under normal circumstances, however, this method of calculating the size of an average air conditioner is fairly accurate.

You can get a standard Btu tabulation and cooling estimate form, usually from the manufacturer, which is a common way to find equivalents and standard cooling loads for different applications. An example of this function is a commonly used standard load of 1500 Btu for kitchen work. People are given an allowance of 200 Btu per person and occupancy is calculated on the basis of two people per bedroom. This means, a three bedroom house will have a 1200 Btu allowance for six people.

Btu calculation formulas used with various thumb-control methods also provide temperature and humidity adjustments where conditions differ from recommended levels. Sometimes this is accomplished by providing humidification and dry-bulb temperature differentials or by providing humidity and temperature adjustment facilities in a specific area.

One of the most popular ways to calculate the size of your next air conditioner is to use one ton of refrigerant for every 500-650 square feet of floor space in your home. A ton of refrigeration is equal to 12,000 Btu per hour. This number is based on the fact that 1 lb of melting ice will absorb 144 Btu of heat over a 24-hour period. Therefore, a ton of ice will absorb almost 290,000 Btu in the same amount of time.

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