Mini-Split Cleaning & Maintenance in Los Angeles

Signs your mini split needs cleaning

The head smells musty or sour for the first minutes after it starts. It blows weaker than it used to on the same fan setting. Water drips from the bottom of the unit or runs down the wall. You can see dark specks on the louvers, or on the blower wheel if you look up through the outlet with a flashlight. Your electric bill climbs while the rooms feel the same. Any one of these is worth a visit. If the cause turns out to be a failed part rather than dirt, we’ll tell you before doing anything else. If none of them shows up and it’s been two years, book a cleaning anyway.

What we found on a real job

On October 1, 2026, a customer in Granada Hills told us their Daikin wall-mounted mini-split smelled musty. With the front panel off, the black on the blower wheel turned out to be dried dust and dirt, and the mold was in the drain pan. We cleaned both indoor units in place with a cleaning bag, foaming coil cleaner and a sprayer rinse, and the rinse water came out dark. The photos are in the write-up of this musty Daikin case, with mold in the drain pan, and the video is further down this page.

Deep cleaning vs. regular maintenance vs. a tune-up

Regular maintenance has two parts. At home, you rinse the filters every four to six weeks and keep the outdoor unit clear. Every one to two years, a technician does the deep cleaning: the head is opened, the coil and the blower wheel are washed in place, and the drain pan and line get cleaned. Many people call that professional visit a mini-split tune-up. On a ductless system, the cleaning is most of that work, and we finish by running the system and checking airflow and drainage. If it isn’t cooling or heating the way it should, that’s diagnosis: we check refrigerant pressures and read codes as part of mini-split repair. A tune-up on a central system is a different visit, covered on our AC tune-up page.

How the coast and the Valley change the schedule

For most homes, every one to two years. Two parts of LA push toward annual maintenance for different reasons.

Near the beach, the problem is moisture. NOAA notes that the West Coast marine layer, the “May Gray” and “June Gloom” of Southern California, can persist for days or weeks. Damp air and a wet coil are a good setting for mold, which is why we suggest a yearly cleaning for homes in Venice, Marina del Rey and Santa Monica. Homes with pets go on the yearly schedule too.

In the Valley it’s runtime. NOAA’s 1991–2020 normals for the Pierce College station in Woodland Hills show about 115 days a year at 90°F or hotter. A head that runs through a summer like that pulls a lot of air, and a lot of dust, through its filters. Rinse them at the four-week end of the range from July through September. Most mini-splits are heat pumps, so the same coil and wheel also do the heating in winter, and a dirty head costs you in both seasons.

Multi-zone systems: cleaning every indoor head

On a multi-zone system, one outdoor unit feeds two or more indoor heads, and each head collects its own dirt depending on how much it runs. We clean and price every head as its own unit, additional units on the same visit are discounted, and we quote the whole system once we know how many heads it has. We don’t clean ceiling cassette units. Concealed ducted units are cleaned when there’s enough access through the ceiling, an access panel or the attic, and we confirm that when you call.

Mitsubishi, Daikin, Fujitsu, LG and other ductless brands

We clean wall-mounted heads from Mitsubishi (Mr. Slim and M-Series), Daikin, Fujitsu, LG, Samsung, Senville, Pioneer, Gree and Carrier/Toshiba. The covers, wheel mounts and drain pans differ from brand to brand, but the job is the same: coil and wheel washed, drain pan cleaned, drain cleared. Tell us the brand when you book, and send a photo of the indoor unit’s label if you have one.

When cleaning isn’t enough: leaks and error codes

Some problems look like dirt and aren’t. Warm air from a head with a clean coil, ice that comes back after a wash, an error code or a fan that won’t spin can point to low refrigerant from a leak, a failed sensor, a control board or a fan motor. Washing the head doesn’t fix any of those, so we diagnose before recommending anything. If we see signs of one during a cleaning, we’ll show you and quote the repair separately. Diagnosis, refrigerant work and parts are covered on our mini-split repair and service page.

Booking a cleaning

Call (213) 205-2055 or text a photo of each indoor head. Tell us how many heads the system has, what rooms they’re in, and when they were last cleaned, if you know. Before the visit, clear the floor under each head and move anything fragile off the wall below it. We quote the cleaning before we start, and the $85 service call is credited toward the cleaning if you go ahead.