How long do mini splits last — and the maintenance that gets you there

A quality ductless system that's installed correctly and maintained typically runs 15 to 20 years. The compressor — the heart of the system — is what usually defines the end of life. Neglect can cut that lifespan in half; good care can push it past 20. The single biggest factor isn't the brand on the box, it's whether it was sized and charged right on day one and cared for after.

• Clean the filters every 4–6 weeks. Pop open each indoor head, slide out the mesh filters, rinse them, let them dry, slide them back. This is the highest-impact thing you can do — clogged filters strangle airflow and efficiency.
• Keep the outdoor unit clear. No leaves, grass clippings, or stored items within a couple feet of it.
• Wipe the indoor heads and watch the condensate drain for slow draining or drips, which signal a clog forming.

Once a year — ideally in spring before cooling season — a professional visit covers what you can't: verify the refrigerant charge, deep-clean the indoor and outdoor coils, flush the condensate drain line, tighten electrical connections, and confirm the system is hitting its rated performance. This is also how you keep the manufacturer's warranty valid — most require documented maintenance.

The killers are predictable: a refrigerant charge that was never dialed in, filters left filthy for years, a clogged drain that backs water into the unit, and an oversized system that short-cycles itself to death. Notice the pattern — most of them are a bad install or skipped maintenance, not the equipment's fault.