Air conditioner maintenance: what to do and when to call a pro
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Author
Andrew Blok
Electrification and Solar Writer and Editor
I’ve had an air conditioner break down in the middle of a Tucson summer. As a renter, I wished I could have had more control over the AC’s maintenance, instead of just waiting for something to go wrong.
A little routine care goes a long way toward keeping your AC running efficiently for as long as possible and heading off unexpected breakdowns. Here's what maintenance your air conditioner actually needs, what you can handle yourself, and what's best left to a licensed technician.
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What maintenance do air conditioners need?
Most AC maintenance falls into two buckets: tasks you can do yourself a few times a year, and tasks a professional should handle at least once annually.
Change or clean the air filter
The easiest, most impactful thing you can do for your AC. A clogged filter restricts airflow and makes your system work harder. Check the filter monthly and replace it every one to three months, depending on your home, air quality, and whether you have pets.
Keep the outdoor unit clear
The outdoor condenser unit needs room to breathe. Clear away leaves and debris, and keep plants trimmed back at least 18 inches to two feet on all sides.
Clean the condenser coils
Dirty condenser coils can't release heat efficiently. Rinsing them gently with a garden hose once a year is manageable for most homeowners. If they're heavily soiled, let a technician handle it with a chemical cleaner.
Check and clear the condensate drain line
Your AC pulls moisture from your home's air as it cools. That moisture exits through a condensate drain line that can clog with algae or mold over time. Flushing the line periodically with diluted bleach or white vinegar prevents blockages and water damage.
Inspect the evaporator coil
The indoor evaporator coil absorbs heat from your home's air and collects dust over time — especially if filters haven't been changed regularly. Cleaning it requires accessing the air handler and the right cleaning solution. Leave this one for a professional service visit.
Check refrigerant levels
Low refrigerant usually means a leak, and adding more without fixing the leak isn't a solution. Refrigerant handling requires certification.
Schedule a professional tune-up before summer
Have your AC professionally serviced each spring, before the heat arrives. HVAC companies book up fast once temperatures climb, and a tune-up in April or May means you're not scrambling for an appointment in July. During a visit, a technician will check electrical connections, test components, inspect refrigerant charge, clean coils, and confirm the system is operating within spec.
| Task | DIY or Professional? |
|---|---|
| Change or clean air filter | DIY |
| Keep outdoor unit clear | DIY |
| Clean condenser coils | DIY (unless heavily soiled) |
| Check and clear condensate drain line | DIY |
| Inspect evaporator coil | Professional |
| Check refrigerant levels | Professional |
| Professional tune-up | Professional |
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Benefits of air conditioner maintenance
Maintenance can help avoid breakdowns, but also brings lots of other benefits.
Lower energy bills: Clean filters, clear coils, and proper refrigerant levels reduce the load on your system. A well-maintained AC uses less energy to do the same job.
Fewer breakdowns: Most AC failures aren't sudden. A technician catching a failing capacitor or a refrigerant leak during a routine visit can prevent the system from dying on the hottest day of the year, when repair appointments are hardest to get.
Longer system life: Central air conditioners typically last 15 to 20 years with proper care. Neglected systems wear out sooner, and replacement is a significant expense.
Better indoor air quality: A clean filter and clear drain line mean fewer allergens and less moisture buildup inside your air handler.
How much does air conditioner maintenance cost?
A professional AC tune-up typically runs between $75 and $200, depending on your location and system size. Emergency repair visits cost considerably more, both in the service call itself and in the urgency premium that comes with needing same-day service mid-summer. Routine maintenance is one of the most practical ways to avoid that scenario.
If you'd rather not track down contractors or manage annual service calls, Palmetto's Comfort Plan includes regular maintenance in a predictable monthly cost that also covers the cost of a new system and many repairs. You get coverage without thinking about it. See if it's a fit for your home.
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Frequently asked questions
How often should I have my air conditioner serviced?
Once a year, ideally in spring before cooling season. Between visits, handle the filter changes yourself (every one to two months for most homes).
Can I do air conditioner maintenance myself?
Some tasks are well within reach: changing the filter, clearing debris from the outdoor unit, and flushing the condensate drain. Others, like refrigerant checks and electrical inspections, require certification. Handling refrigerant without it is both illegal and potentially dangerous.
What happens if you don't service your air conditioner?
Efficiency drops as filters clog and coils get dirty. Your system works harder, your energy bills climb, and small problems grow into expensive repairs. Deferred maintenance is a common reason AC systems fail early.
How long do air conditioners last?
A properly maintained central AC can last 15 to 20 years. If yours is more than 10 to 12 years old and starting to have problems, it may be worth discussing replacement rather than continued repairs with an HVAC professional.
What temperature should I set my air conditioner to?
For most homes, somewhere between 72°F and 78°F works well during summer. The smaller the gap between your indoor set point and the outdoor temperature, the less your system has to work. See Palmetto's guide to ideal summer air conditioner temperature settings (or the best thermostat setting all year long)for more.
Disclaimer: This content is for educational purposes only. Palmetto does not provide tax, legal, or accounting advice. Please consult your own tax, legal, and accounting advisors.
