![]() How to Calculate The Proper Size According to ZonesĪs a general rule, a home in the hot, humid conditions of zone 1 or 2, might need to remove up to 30 BTU of heat for every square foot of floor area. Consequently, zone 4 and the remaining areas of the US need an alternative heat source to provide suitable comfort levels.Įach climate zone will have a different impact on the type of system and size of air conditioner to make your home comfortable. However, most areas in this zone only achieve an average annual temperature of 55☏ahenreit. Zone 4 with a more moderate climate, starts from Virginia in the east to New Mexico, taking in Oregon and Washington State. Zone 3 is still warm, extending westward from Colombia in North Carolina to Tucson, Arizona as well as most of California, however it lacks the humidity of zones 1 or 2. Zones 1 and 2, are warm, humid regions, taking in all of Florida and stretching west from Georgia to Eldorado, Texas, including south west Arizona. This is an old catch phrase, but it also applies to find the right air conditioner for your house.Īs you can see from the map, the United States is divided into around eight different climatic zones, from the hot-humid zone 1 of southern Florida, Puerto Rico, Virgin Islands, Hawaii and Guam to zones 7 and 8 of Alaska. 3 Main Factors Affecting The Size #1 Location Now that we understand how air conditioners are rated, let’s consider some other important factors. You might see this rating stamped on the name plate of an air conditioner that you buy, either in tons or in BTU’s. For example, a 3 ton ac unit has 36,000 BTU/hr, a 5 ton ac unit has 60,000 BTU/hr. So, when we talk about an air conditioner unit rated at 1 ton or 2 or 3 ton, it just means the required amount of energy in BTU to provide that amount of cooling is 12,000 times the rated tonnage. Therefore, for every one ton of ice, 12,000 BTU’s (288,000/24=12,000 BTU) per hour are required.Ĭonsequently, the term “ton” became commonly used for refrigeration or air conditioner performance. What is a Ton of Refrigeration?īefore the advent of refrigeration, ice makers commonly used BTU’s to measure their energy needs and estimated 288,000 BTU’s were needed in a 24 hour period to make 2000 pounds or one ton of ice. A total of 12,000 BTU’s of cooling capacity per hour equals 1 ton of refrigeration. Importance of Choosing the Right Size UnitĪ British Thermal Unit or BTU is the basic unit of heat energy used by the HVAC and other industries.
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