DUCTLESS MINI-SPLITS · YAKIMA VALLEY
Ductless mini-split installation, repair and maintenance in Yakima
Theisen carries Mitsubishi ductless systems. When a wall head cools badly, rattles or smells wrong, a licensed crew from the Yakima shop diagnoses it and fixes what is actually failing.
Chapter 01
What goes wrong with a mini-split
A ductless mini-split is one refrigerant circuit split across your house: an outdoor unit on a pad or bracket, one or more wall heads inside, and a line set and control cable running through the wall between them. Nothing hides in a duct, so trouble shows up where you sit. The signs the shop lists are short and familiar: reduced cooling, strange noises, or unusual odors.
Behind those symptoms the usual suspects are refrigerant leaks, a faulty component, or an electrical problem. Those are the three repairs Theisen names on its service page, and they are very different jobs. A leak means the circuit has to be found and fixed, not just topped up. A failed part needs a diagnosis, not a guess. An electrical fault belongs to someone licensed to open the panel.
That last point is why the licence matters on this page. A mini-split runs on line-voltage power, and Theisen holds a Washington electrical contractor licence in HVAC/R, THEISHC77815, alongside its Washington contractor registration, THEISHC778J5. That covers the wiring side of a mini-split job as well as the refrigerant side.
A Mitsubishi ductless wall head mounted in a grey room with crown moulding.
How a mini-split job runs
Theisen installs, repairs and maintains ductless mini-splits, and Mitsubishi is the ductless brand on the shop's brand list. The outdoor unit and the wall head pictured further down this page are both Mitsubishi, from the job photos in the project showcase.
A repair visit starts with finding the cause. Replacing a faulty component, fixing a refrigerant leak and resolving an electrical problem are separate fixes, and the visit is built around working out which one you have before anything is swapped. Reviewers on Google, Yelp and Angi keep mentioning the same thing about the shop: the technician explained what he was doing while he did it.
An installation is a different kind of day, because the outdoor unit, the wall head and the run between them all have to agree with the house. If you are weighing a mini-split against replacing a furnace or an air conditioner on existing ducts, the office can talk through both. Call weekdays 8 to 5, or leave a few lines on the contact page and the office calls you back to set a time.
Chapter 03
Keeping a mini-split running after the visit
Maintenance is how a mini-split stays out of the repair column. Theisen's ductless maintenance visit inspects and cleans the system, from checking refrigerant levels to inspecting electrical components. The point is to catch a slow leak or a tired connection while it is still a small job.
Between visits, the wall head tells you what it needs. Cooling that has faded, a new noise or a smell when it starts up are all worth a phone call rather than another week of waiting. Ask the technician at the visit what you can rinse or wipe yourself and what to leave alone, so the next call is for something real.
Mini-splits are not a side line at Theisen. They sit beside heating, air conditioning and furnace cleaning as one of four services the shop offers in Yakima. If the same house has an old furnace or an aging condenser, ask about those on the same call.
“Prompt, professional, reasonably priced.” Jeff Wangler, Google review of an air conditioning repair, July 2025.
One Mitsubishi install, outside and in
These two frames come from Theisen’s own project showcase. For the rest of the work, see the project showcase. If the house also needs a furnace or a new cooling system, read about heating and air conditioning, or see the full list on the services page. To book a visit, send the office a note.
