For a single room, portable and window air conditioners is recommended because of its portability. As the compressor, condenser, expansion valve, evaporator, cooling coil are all in a single box which then fits in a windowsill/wall hole. Central air conditioning with a large external central condenser connected to an indoor air handling unit is opted in case you want to have an AC for your entire home. Ductless air conditioners also called mini-split, multi-split or split-ductless systems are great for cooling one, two or more rooms wherein like central air conditioning they have a central condenser and an indoor air handling unit but connected by conduit instead of duct work eliminating the need to tear down walls and ceilings. Read this article to know what SEER and BTU rating means and how they fit with EER or Energy Efficiency Ratio for your final air conditioner pick between central air conditioning and ductless air conditioners.
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How to Choose an Air Conditioner