![]() ![]() When installing a ductless AC solution to your home, your sizing consideration should factor in the size of the room for single-zone application or each of the individual rooms for a multi-zone configuration. Knowing the size of each unit will guide you to install a correctly sized system properly. The indoor and outdoor units have varying sizes or rated capacities in ductless mini splits. All Ductless Mini Splits Are Designed with a Specific Size in MindĪir conditioners, including ductless mini split systems, are built in different sizes to fit inside rooms and zones of different dimensions.Įach system is designed explicitly to operate in a specific range of room size. The higher the BTU or tonnage rating, the more powerful the mini split system is, as it has a higher heat transfer rate per hour. There are also systems with less than one ton, such as 0.75-ton mini splits (9,000 BTU) and even 0.5-ton (6,000 BTU) models. Therefore, a system rated at 1.5 tons has a capacity of about 18,000 BTU, whereas a 4-ton system has a capacity of 48,000 tons. One ton of refrigeration is approximately equivalent to 12,000 BTU per hour. Consequently, some manufacturers may prefer to use the term “BTU per hour” or “BTUh.” In HVAC contexts, the BTU value of an air conditioner specifically refers to the amount of BTUs it can remove (or add, if it is a heat pump) per hour. One ton of refrigeration equals the amount of heat needed to melt or freeze one short ton (2,000 lbs) of pure ice in 24 hours.
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