How often should you clean your mini-split filters?

Skipping it eventually leads to water damage or an expensive repair.

Staying on schedule matters beyond the repair bill: a consistent maintenance record is one of the factors in a home's Roots Home Health Score, and well-kept homes typically sell faster and closer to asking price.

How to do it

The washable filters in each indoor head catch dust before it hits the coil. They clog quickly, and a blocked filter ices the coil and lets mold grow inside the unit where you breathe it.

1. Open the front cover of each indoor head and lift out the mesh filters.
2. Rinse them under lukewarm water, let them dry fully, and slide them back in.
3. Wipe the visible parts of the intake and the cover while they dry.
4. Repeat for every head; each one has its own filters.

Alternatives & optional extras

• A deeper coil-and-blower cleaning once a year keeps musty smells away; that part is worth a pro.
• Homes with pets or heavy use should rinse the filters monthly.

Time: 15 minutes · Typical cost: Free

If you skip it

Clogged filters ice the coil, cut cooling, and let mold establish inside the head, which then blows into the room.

Other mini-split / ductless ac maintenance

• Rinse mini-split outdoor unit coil — once a year, ideally in May

Related systems to keep on schedule

• Boiler / radiators — start with: schedule boiler service, once a year, ideally in September
• Furnace / heating system — start with: replace hvac air filter, every 3 months
• Air conditioner — start with: schedule ac tune-up, once a year, ideally in April
• Tankless water heater — start with: descale tankless water heater, once a year