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Guidelines for Getting the Most Out of Ductless Heating and Cooling

Ductless heating and cooling systems provide year-round comfort at substantially lower energy costs than forced-air systems or electric furnaces. However, to leverage maximum efficiency and comfort, the ductless system must be used correctly. Here are some tips for maximizing the use of a ductless heating and cooling system.

Warm Weather Operation

Ductless systems utilize point-of-use air handling units (AHUs) to provide zoned air conditioning on demand. Zoned control offers advantages for comfort and efficiency by cooling only occupied zones rather than the entire home. Unlike a forced-air system that must have free airflow throughout the entire home, ductless systems cool zones more efficiently when doors to other rooms are closed.

To promote maximum heat extraction, keep the AHU clean. Check the air filter monthly during peak usage. If dirt is visible, wash the filter and let it air dry completely before reinserting. Check the AHU coil for debris, and wipe with a soft cloth as needed.

Cool Weather Operation

Mitsubishi Electric ductless systems offer substantial heating power, even when outside temperatures fall to single digits. Like conventional heat pumps, however, the outside coil is susceptible to frost and ice accumulation. The defrost cycle of your ductless system should mitigate frost and ice automatically. During defrost mode, the indoor AHU will temporarily turn off as hot refrigerant is circulated through the outdoor coil. This is normal and should only last a few minutes.

Automatic Controls

Many ductless systems have automatic functions for fan operation and switching between "heat" and "cool" modes. Set the temperature controls to either "heat" or "cool" to avoid automatic mode changes in more moderate outside temperatures. This will save energy and reduce wear. The fan speed, however, should be set to "auto" mode. This allows the ductless system to adjust airflow as needed to maximize heat exchange.

Learn more ductless heating and cooling operating tips from the pros at Mitsubishi Electric, or contact us today to find a Mitsubishi Electric contractor in your area.

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