7 AC Maintenance Mistakes Arizona Homeowners Often Make (And How to Avoid Them)

Living in Arizona, especially in hot spots like Mesa and Tucson, means your air conditioner is more than a luxury—it’s essential. With scorching summer temps and long cooling seasons, your AC works overtime.

That’s why routine AC maintenance in Mesa and Tucson is critical. But even well-meaning homeowners can unknowingly make mistakes that lead to higher energy bills, expensive repairs, or even total system failure.

Here are 7 common Mesa and Tucson AC maintenance mistakes Arizona homeowners make—and how you can avoid them to keep your system running strong all season long.

Have questions or need to schedule service? Call our Tucson or Mesa air conditioning experts now!

1. Forgetting to Replace the Air Filter

Why it matters: Dirty or clogged air filters restrict airflow and cause your system to work harder, increasing wear and tear while decreasing indoor air quality.

What can go wrong:

• Higher energy bills
• Reduced cooling performance
• Strain on the blower motor
• Dust and allergens circulating in your home

What to do instead: Check your filter every month, especially during peak summer. Replace it every 1-3 months based on usage, pets, or allergy sensitivities. Consider high-efficiency filters for better air purification.

2. Ignoring Weird Sounds or Smells

Why it matters: Odd noises or unusual odors can be early warnings of major issues like refrigerant leaks, mold, or electrical problems.

Red flags to watch for:

• Hissing or bubbling (possible refrigerant leak)
• Grinding or squealing (motor issues or worn belts)
• Musty odors (potential mold)
• Burning smells (electrical hazard)

What to do instead: If something doesn’t sound or smell right, shut off your AC and call a professional right away. Early action can prevent system damage or even fire risk.

3. Skipping Annual AC Tune-Ups

Why it matters: Just because your AC is running doesn’t mean it’s running efficiently. Skipping inspections means small problems can turn into costly repairs.

What professionals check during AC maintenance:

• Refrigerant levels and leaks
• Coil cleaning
• Electrical component safety
• Duct airflow and thermostat calibration

What to do instead: Book an AC inspection every spring before temperatures spike. Joining a maintenance plan means you’ll never forget and often includes priority service.

4. Setting the Thermostat Too Low

Why it matters: Cranking the thermostat down to 68°F won’t cool your home faster. It just makes your unit work harder and increases your bills.

The risks:

• Premature system wear
• Frozen coils
• Wasted energy

What to do instead: Keep your thermostat between 74-78°F for optimal comfort and efficiency. Use a smart thermostat to automate temperature adjustments throughout the day.

5. Blocking Vents with Furniture or Curtains

Why it matters: Blocked air vents create uneven cooling and force your AC to compensate, using more energy.

Common causes:

• Couches, beds, or rugs over floor vents
• Curtains covering wall vents

What to do instead: Ensure all vents are clear of obstructions and clean them regularly to prevent dust buildup.

6. Trying DIY Fixes for Complex Problems

Why it matters: HVAC systems are complicated, and trying to fix electrical or refrigerant issues on your own can lead to bigger problems.

Risks of DIY repairs:

• Voiding your warranty
• Causing electrical hazards
• Making the issue worse

What to do instead: Change filters and clean vents yourself, but leave complex diagnostics and repairs to certified HVAC professionals.

7. Neglecting Your Ductwork

Why it matters: Leaky or dirty ducts reduce system efficiency by up to 30% and can negatively affect your air quality.

What to watch for:

• Hot and cold spots in your home
• Excess dust
• Higher-than-usual energy bills

What to do instead: Schedule duct inspections every few years and clean your ducts when needed. Sealing leaks and removing buildup can dramatically improve airflow.

Need Expert AC Help in Mesa or Tucson?

Avoiding these maintenance pitfalls will save you money, reduce breakdowns, and keep your AC running like a champ through Arizona’s hottest months. At Western States Home Services, our friendly, certified HVAC techs offer fast, reliable service to homeowners across the Valley and Southern Arizona.

Call us today to schedule your AC tune-up or inspection and beat the heat before it hits!

Customer Q&A: AC Maintenance Tips