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Ductless Air Conditioner & HVAC Systems

Ductless air conditioning systems continue to gain popularity as consumers search for cost effective alternatives to conventional central heating and cooling products. Often referred to as ductless mini split systems, these quiet, efficient units provide architects and engineers with a myriad of options for dealing with design idiosyncrasies and structural challenges.

The Basics of Ductless Air Conditioning

Ductless heating systems and air conditioners operate in the same fundamental manner as their ducted counterparts. The cycle begins when refrigerant enters the compressor as a low-pressure liquid. The compressor applies force to the refrigerant and transforms it into a high-pressure gas. The action of the condensing coil and fan dissipate a significant portion of the heat into the atmosphere, and the temperature of the refrigerant is lowered until it emerges as a high-pressure liquid. As the refrigerant flows through the evaporator coil, it passes through an expansion valve, which causes a pressure drop, and the refrigerant is changed into to a low-pressure liquid. The air handler’s blower pulls warm air from the living area across the indoor coil, and the evaporation process converts the liquid to a low-pressure gas. The cooler air is forced back into the living area, and the refrigerant returns to the compressor where the cycle is repeated.

Both conventional and ductless AC systems include separate indoor and outdoor components. The outdoor condensing unit is similar in each configuration and incorporates the compressor, condensing coil and a fan. The indoor air handler in a Mitsubishi Electric air conditioner is dramatically different since it integrates the blower and evaporator coil in a small, attractive cabinet that can be hung on a wall or installed in the ceiling. Placing the fan coil unit in direct proximity to the cooling target can help enhance comfort and lower operating costs since the efficiency of the unit isn’t degraded by long duct runs.

Ductless Configurations

Perhaps the most attractive aspect of ductless technology is the flexibility to shape heating and cooling systems in a variety of ways. A Mitsubishi Electric mini split or heat pump includes one indoor air handler connected to a single-zone condensing unit. This combination is effective for cooling an individual room or a specific space. This includes attics, garage conversions, room additions and other areas needing supplemental cooling or heating. In locations with ample outdoor ground space, single-zone systems can be configured to condition an entire building.

A multi-split system includes a single outdoor condensing unit that is connected to multiple indoor air handlers. This is a cost effective method can control comfort in several rooms or an entire house. In this master/slave configuration, one indoor unit is outfitted with a thermostat. When there is a call for cooling, all of the fan coils are activated simultaneously. While this arrangement may work in some instances, it should only be used in applications where every room has a comparable cooling load. For the best results in multi-zone cooling and heating, the condensing unit must be outfitted with separate compressor circuits connected to each air handler. Since every zone has its own dedicated thermostat, family members can set the temperature to meet their personal comfort requirements.

Be sure to contact one of the Mitsubishi Electric contractors on this website for more information about going ductless.

6 months Same as Cash Financing Available*

* With approved credit, see contractor for complete details. 6 Month Same As Cash (SAC): First payment is not due until 6 months from the date of the contract. If the customer pays the entire amount by the end of the 6-month SAC term, they are not charged interest for the period. Payment in full must be received prior to the end of the 6-month period for the finance charges to be waived. If payment is NOT received in full by the end of the 6-month period, the finance charges for the 6-month period will accrue from the original date of the contract and on the original financed amount.


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