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Ductless Heating

Ductless Mini Split Heating and CoolingMitsubishi Electric helped pioneer the mini-split (or ductless) technology as a means of providing Japan’s growing population with a highly efficient way to cool and heat their homes and businesses. They designed the Mr. Slim system to fit into spaces that could not otherwise have been effectively heated or cooled due to the close proximity of Japan’s buildings, plus they needed a system that was extremely quiet.
High Efficient Mitsubishi Heat Pumps and Air Conditioners

The term ductless means simply that no ductwork is involved. The system is comprised of two units: a slim-line outdoor condenser, and an indoor air handler. The condenser supplies coolant to the air handler through refrigerant lines that run through a small opening in the wall or ceiling and into the back of the unit. The air handler takes in supply air from the room through the front grill and dispenses the newly-cooled air back into the room. For certain models special filters are available that promote added humidity control and filtration.

A Little History

Air conditioning was a recently-added comfort for Japan. Americans introduced window and central air conditioning to Japan at the end of World War II in the forms of ducted systems and window units. These types were not suitable for Japan because of the limited interior spacing and close proximity of its buildings. And with the high density of population Japan required a more compact and noiseless air conditioning system. Additionally, energy costs were very high for the Japanese people, as much as five times higher than that of the United States.


Ductless heating and CoolingDuctless mini-splits are the ideal air conditioning solution for installations where adding ductwork is impractical or too expensive. The matched combination of indoor air handler and outdoor condenser is efficient and easy to install.

Mini split Air Conditioners or Heat Pumps have two main components: an outdoor unit containing compressor and condenser, and an indoor air-handling unit, containing evaporator and blower. A conduit, which houses the power cable, refrigerant tubing and condensate drain, links the outdoor and indoor units. Ductless mini split air-conditioners have numerous potential applications and advantages. They are perfect for those home/business owners that do not have central air conditioning, and do not want to settle for the noise, insecurity and inefficiency of window AC units.

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