Tacoma Ductless Mini-Split Installation | Mitsubishi Multi-Zone in 98444

The Challenge

This Tacoma homeowner was relying on electric baseboard heating and had an older single-zone ductless unit that was no longer meeting the home’s comfort needs. The goal was a modern, energy-efficient solution that could handle both heating and cooling across the main living space and a back bedroom without requiring ductwork installation.

The installation presented a few specific logistics to sort through:

• Refrigerant lines needed to run through the attic, following the same path as the existing lineset
• A condensate pump was needed for the back bedroom head to ensure proper drainage if gravity drain wasn’t practical
• New electrical disconnect and whip were required for the updated system
• Outdoor unit pad and crushed rock leveling were needed for a stable, code-compliant installation
• Existing line hide was preserved or replaced as needed to keep the exterior clean

Our Solution

Pacific installed a Mitsubishi MXZ-4-D30NL multi-zone outdoor condenser paired with two GX Series wall-mount indoor heads: an 18,000 BTU unit in the main living room and a 12,000 BTU unit in the back bedroom. The refrigerant lines were routed through the attic following the established path, keeping the installation clean and minimizing disruption to the home’s interior.

A new concrete fiber pad with crushed rock leveling was installed for the outdoor unit, and a new electrical disconnect and whip were added to meet code requirements. The condensate from the back bedroom head was evaluated for gravity drain options, and a condensate pump was included in the plan to give the homeowner flexibility. The team also coordinated the permit and inspection process as part of the installation.

Military veteran discount applied to the total investment as a thank-you for Michael’s service

Equipment List

• Outdoor Condenser: Mitsubishi MXZ-4-D30NL, 4-port multi-zone condenser, 30,000 BTU, 454B refrigerant, variable-speed INVERTER-driven compressor, Energy Star certified, as low as 50 dB(A) outdoor operation
• Indoor Head (Living Room): Mitsubishi MSZ-GX18NL, 18,000 BTU wall-mount head, GX Series, 12″H x 37″W x 10″D
• Indoor Head (Back Bedroom): Mitsubishi MSZ-GX12NL, 12,000 BTU wall-mount head, GX Series, 12″H x 32″W x 10″D

Performance and Comfort Benefits

• Independent temperature control in the living room and back bedroom means each space can be set to exactly what feels right, without one zone affecting the other
• The variable-speed INVERTER-driven compressor adjusts output continuously rather than cycling on and off, which maintains steadier temperatures and uses less energy overall
• Both heating and cooling are handled by a single system, replacing the need for separate equipment and the operating costs that come with electric baseboard heat
• The Mitsubishi MXZ-4-D30NL maintains heating capacity down to 17 degrees Fahrenheit outdoors, which keeps the system effective through Western Washington’s coldest winter stretches
• Quiet outdoor operation at 50 dB(A) means the unit runs without being noticeable from inside or outside the home
• Energy Star certification and 454B refrigerant align the system with current efficiency and environmental standards

Why This Matters for Tacoma Homeowners

Ductless mini-split systems have become one of the most practical upgrades available to Tacoma homeowners, especially in homes that were originally built without central HVAC ductwork. Electric baseboard heat is common in older Western Washington homes, but it runs at 100% electricity with no way to adjust efficiency based on outdoor conditions. A heat pump system like this Mitsubishi setup delivers both heating and cooling using a fraction of that energy by moving heat rather than generating it.

Multi-zone configurations add another layer of practical value. A single outdoor unit can serve multiple rooms independently, which means the living space and bedroom no longer have to compromise on temperature. Homeowners can heat or cool only the rooms being used, and each occupant can set their own preference without arguing over a central thermostat. For homes with varying sun exposure, older windows, or rooms that consistently run warmer or cooler than the rest of the house, that kind of control makes a real difference day to day.

Pacific handles the full scope of a ductless installation, from pulling permits and coordinating inspections to running the refrigerant lines and configuring the electrical connections. This project included attic lineset routing, pad leveling, and condensate management planning, all of which were worked out in advance so the installation day ran clean. Michael’s feedback about the crew reflects what Pacific aims for on every job: a team that treats the home with care and completes the work to a standard the homeowner can feel confident in.