Mid-Summer AC System Maintenance: Keep Your System Cool and Efficient

By midsummer, your air conditioning system has likely been working hard for weeks—sometimes around the clock. To keep it running efficiently and avoid unexpected breakdowns during the hottest part of the year, mid-season maintenance is essential. Whether you're a do it yourself homeowner or prefer to call in a professional, here's what you should do—and what to look out for.

Important Midsummer AC System Maintenance Tasks

1. Check and Replace the Air Filter: You should check your air filter monthly in the summer. If it looks dirty or clogged, replace it. A clean filter helps maintain proper airflow, improves air quality, and reduces strain on your system.
2. Clear Debris Around the Outdoor Unit: Grass clippings, leaves, and other debris can accumulate around your outdoor condenser unit. Make sure there's at least 2 feet of clear space around the unit for proper airflow.
3. Clean the Condenser Coils: Dirty coils reduce your system's efficiency and force it to work harder. Use a garden hose on a low-pressure setting to gently rinse the coils (after turning off power to the unit). If you're unsure or uncomfortable doing this, call a professional HVAC technician.
4. Check the Thermostat: Make sure your thermostat is working correctly and set to a comfortable, energy-efficient temperature—typically around 76–78°F when you're home. Consider upgrading to a smart thermostat if you haven't already.
5. Inspect Insulation on Refrigerant Lines: The insulation on your AC's refrigerant lines should be intact. If you notice any damage or deterioration, it can affect your system’s cooling efficiency and may need to be replaced.
6. Examine Your Home’s Air Vents: Ensure all indoor vents are open and unblocked. Furniture or rugs that block vents can restrict airflow and make your AC work harder than necessary.
7. Listen and Smell for Trouble: Odd sounds, such as grinding, rattling, or buzzing, or unusual odors (especially musty or burning smells) may signal problems with the motor, wiring, or mold growth. A technician should check these out.

What Homeowners Should Watch For

• Higher-than-usual energy bills: A sudden spike can indicate that your system is operating inefficiently due to a dirty filter, refrigerant issue, or failing component.
• Uneven cooling: If some rooms are much warmer than others, you might have blocked vents, duct leaks, or problems with zone controls.
• Short cycling: If your AC turns on and off frequently, it could be an issue with the thermostat, low refrigerant, or an oversized unit.
• Excess humidity indoors: Your AC also removes humidity. If your home feels sticky, it may indicate a malfunction or that your unit is undersized or oversized.

When is it Time to Call a Pro?

While most homeowners can do basic maintenance, mid-summer is also a smart time to schedule a professional HVAC tune-up—especially if you didn't have one done in the spring. A technician can:

• Check refrigerant levels and recharge if needed
• Inspect and tighten electrical connections
• Lubricate moving parts
• Test system controls and safety devices
• Clean the condensate drain to prevent clogs and water damage