AC Maintenance: What Homeowners Can Do

Regular maintenance keeps your air conditioner running efficiently and helps prevent breakdowns during hot weather. Here is what you can do yourself and when to call for professional service.

Monthly Tasks During Cooling Season

Replace or Clean Air Filter - Check monthly during heavy use - Replace standard filters monthly - Clean reusable filters per manufacturer instructions - A dirty filter makes your AC work harder and can cause ice buildup

Keep Vents Clear - Ensure furniture, curtains, and rugs are not blocking vents - Keep both supply and return vents unobstructed - Do not close more than 20% of vents

Outdoor Unit Maintenance

Keep It Clear - Maintain 2 feet of clearance on all sides - Trim vegetation away from the unit - Remove leaves, grass clippings, and debris regularly

Gentle Cleaning **You can safely:** - Rinse the unit gently with a garden hose - Remove visible debris from the fins - Clear the area underneath the unit

**Avoid:**

• High-pressure washing (can damage fins)
• Bending fins with tools
• Using harsh chemicals

Seasonal Startup Before the first hot day: 1. Check that the outdoor unit is clear 2. Verify the disconnect switch is on 3. Set thermostat to cool, temperature below current 4. Watch and listen for normal startup 5. Let it run 10-15 minutes and verify cool air

Indoor Maintenance

Check Drain Line High-efficiency AC units produce condensation that must drain: - Locate the drain line (usually a PVC pipe) - Check for clogs or standing water - Some homeowners flush the line with vinegar solution - Ensure the drip pan is dry

Inspect Accessible Ductwork In attics, basements, or crawlspaces: - Look for disconnected or damaged sections - Check for obvious leaks at connections - Note any crushed or kinked flexible duct

Annual Professional Maintenance

Have a professional tune-up in spring that includes:

• Refrigerant level check
• Coil cleaning (evaporator and condenser)
• Electrical connections inspection
• Blower motor check
• Thermostat calibration
• Overall system inspection

Warning Signs to Watch For

Contact a professional if you notice:

• Ice on refrigerant lines or indoor coil
• Warm air despite proper settings
• Unusual sounds (grinding, squealing, banging)
• Water leaking from indoor unit
• Higher energy bills without explanation
• Short cycling (turning on and off frequently)
• Reduced airflow from vents
• Unpleasant odors when AC runs

Bay Area Considerations

Our mild climate means AC units may sit unused for extended periods. Before the first use of the season, always check the unit and run it for a test period to catch any issues before you really need cooling.