Ductless Mini-Split Systems

Targeted Comfort Without the Ductwork

Ductless mini-split systems have transformed the way homeowners think about heating and cooling. By eliminating the need for ductwork, these versatile systems can be installed in virtually any space with minimal disruption to your home. At Treat's Heating & Cooling, we have been installing and servicing ductless systems throughout Western Washington for years, and we have seen firsthand how they solve comfort problems that traditional HVAC systems cannot. Whether you have a room that is always too hot or too cold, a home addition that needs its own climate control, or an older home with no existing ductwork, a ductless mini-split may be the ideal solution.

How Ductless Mini-Splits Work

A ductless mini-split system consists of two main components: a compact outdoor compressor unit and one or more indoor air handlers. The two are connected by a small conduit that passes through a three-inch hole in the exterior wall, carrying the refrigerant lines, power cable, and condensate drain. The indoor units can be wall-mounted, ceiling-recessed, or floor-standing, depending on the room's layout and your aesthetic preferences. Each indoor unit has its own thermostat and remote control, allowing you to set the exact temperature you want in each room. In heating mode, the system works like a heat pump, extracting heat from the outdoor air and delivering it inside. In cooling mode, it reverses the process and removes heat from your home, just like a conventional air conditioner.

Zone Control & Energy Efficiency

One of the greatest advantages of a ductless system is zone control. Instead of heating or cooling your entire home to a single temperature, you can condition only the rooms that are in use. If you spend most of your time in the living room and kitchen during the day and only use the bedrooms at night, a multi-zone ductless system lets you direct energy only where it is needed, avoiding waste. Additionally, ductless systems eliminate the energy losses associated with ductwork. Studies by the Department of Energy have shown that duct losses can account for more than 25 percent of the energy consumed by a central forced-air system, especially if the ducts are in an unconditioned attic or crawl space. By delivering conditioned air directly to each room, a ductless mini-split avoids this waste entirely.

Ideal Applications for Ductless Systems

Ductless mini-splits are an excellent choice for a wide range of applications. They are perfect for older homes that were built without ductwork and would be expensive to retrofit. They work well in room additions, converted garages, finished attics, and above-garage bonus rooms where extending existing ductwork is impractical. They are popular for sunrooms and enclosed porches that are not connected to the main HVAC system. They provide supplemental heating and cooling for rooms that are always uncomfortable because they are at the end of a long duct run or on a different floor than the thermostat. Multi-zone ductless systems can even serve as the primary HVAC system for an entire home, providing individualized comfort in every room.

Ductless Installation & Repair

Our certified technicians handle every aspect of ductless installation, from helping you choose the right system and configuration to positioning indoor units for optimal comfort and aesthetics. Most single-zone installations can be completed in one day, and multi-zone systems typically take two to three days. Installation is far less invasive than adding ductwork, with no major construction required. We also provide comprehensive repair service for all ductless brands, addressing issues such as refrigerant leaks, compressor failures, error codes, drainage problems, and remote control or connectivity issues. Our maintenance plans include annual tune-ups that keep your ductless system running at peak efficiency and help prevent costly breakdowns.