How long does a mini-split last?
Updated August 2026
A ductless mini-split lasts 10–20 years, with most landing around 15. They tend to edge out conventional central systems on longevity for one reason: the inverter-driven compressor ramps up and down smoothly instead of slamming on and off, so it avoids the hard starts that wear a single-speed AC. The catch is that mini-splits punish neglect fast. Their filters are small and easy to reach, which makes them easy to ignore, and a clogged filter or a fouled outdoor coil chokes airflow and makes the compressor labor. A unit whose filters get rinsed monthly and whose outdoor section stays clean reaches 18–20; one left dirty may quit at 10.
Lifespan by type and situation
| Type or situation | Typical lifespan | Why |
|---|---|---|
| Ductless mini-split (typical) | 10–20 years | Inverter compressors run gently, helping longevity |
| Filters cleaned monthly, coil kept clean | 18–20 years | Open airflow keeps the compressor from overworking |
| Filters and coil neglected | 10–12 years | Choked airflow overheats the compressor |
| Coastal, salt exposure | 8–12 years | Salt corrodes the outdoor coil and fasteners |
| Multi-zone system | 10–18 years | More indoor heads and a larger compressor to fail |
| Used year-round for heat and cool | 10–15 years | Double-season runtime adds wear, as with any heat pump |
Signs yours is near the end
- Weak airflow or reduced cooling even right after the filters are cleaned
- Water dripping from an indoor head, a sign the drain line is clogged
- Grinding or rattling from the outdoor fan, or a compressor that hums but struggles to start
- Error codes on the head that return after a reset
- A musty smell from the indoor unit, from mold in the coil or blower wheel
- Rising electric use and repairs on a system already past 12 years
How to add years
Mini-splits reward small, frequent care. Rinse the filters every 2–4 weeks in cooling season, since those thin screens clog fast and starve the coil. Once a year, have the indoor blower and coil deep-cleaned to clear the mold and grime a filter cannot catch, and flush the drain line so it does not back up and drip. Keep the outdoor unit clear of leaves and snow and rinse its coil each spring. Do all this and a mini-split reaches the top of its range; skip it and the compressor pays. Once a unit passes 12 to 15 years with a failing compressor, weigh a replacement.
What it costs to replace: plan on $3,000–8,000 per zone installed. Replacing on your own schedule, before it fails, is almost always cheaper than the emergency version. The home maintenance cost calculator helps you set the money aside before it comes due.
OnOtto tracks your mini-split filter cleanings age and service history, and warns you before end of life instead of after the flood.
Track your home's systems, free for 30 daysFrequently asked questions
Do mini-splits last longer than central AC?
Often a little, yes. A well-kept mini-split can reach 20 years against a central AC's 12–17, largely because its inverter compressor modulates instead of hard-starting, the motion that wears a single-speed unit. But the edge is not automatic. Mini-split filters need cleaning every few weeks, not every few months, and a neglected head chokes and fails as fast as anything. Maintained on schedule, the ductless system usually wins; ignored, it does not.
How often do mini-split filters need cleaning?
Every 2–4 weeks during heavy use, more often with pets or daily running. The filters are reusable plastic screens you pop out, rinse under the tap, dry, and slide back, a five-minute job with no parts to buy. Skipping it is the number-one way owners shorten a mini-split's life: a clogged filter starves the coil, ices it up, and forces the compressor to labor. Set a monthly reminder through cooling season and the unit runs efficiently for years.
Why is my mini-split leaking water inside?
Almost always a clogged condensate drain. A mini-split pulls moisture from the air and channels it out through a small drain line, and when algae, dust, or a kink blocks that line, the water backs up and drips from the indoor head onto the wall or floor. Flushing the drain line once a year usually prevents it. If cleaning the line does not stop the leak, the drain pan or pump may have failed, which is a job for a technician.