Think your AC is running just fine? You might be making mistakes that are raising your energy bills, shortening your unit’s lifespan, and even affecting your indoor air quality. Whether you're a new homeowner or someone just trying to survive the summer heat, here are 5 common air conditioner mistakes to avoid and how to fix them before they turn into expensive problems.

1. Skipping Regular Maintenance

Just like a car, your AC needs annual checkups. Dust, debris, and general wear can add up over time, leading to higher energy bills, surprise breakdowns, and a shorter lifespan for your system.

✅ What to do:

Schedule professional maintenance at least once a year, preferably before peak summer months. Trade pros can spot issues before they snowball into major repairs.

2. Never Changing the Filter

A dirty filter restricts airflow, making your system work overtime and reducing efficiency. Worse, it circulates dust and allergens throughout your home.

✅ What to do:

Change your air filter every 1–3 months. More often if you have pets, allergies, or live in a dusty area

3. Setting the Thermostat Too Low

Setting your thermostat to 60°F won’t cool your home faster, it only forces your AC to run longer, wasting energy and increasing your bills.

✅ What to do:

Use a programmable thermostat or smart controls to regulate temperature efficiently. Aim for 72–75°F when you’re home, and higher when you’re away.

4. Blocking Air Vents

Furniture, rugs, or storage boxes covering air vents can lead to poor airflow and uneven cooling. Your AC may be running nonstop, but your room still feels warm.

✅ What to do:

Keep vents clear and unobstructed. Even a few inches of clearance can make a big difference.

5. Ignoring Strange Noises or Smells

That buzzing, rattling, or musty odor? It’s not just annoying, it’s your system asking for help. These can be signs of loose parts, mold, or electrical issues.

✅ What to do:

Don’t ignore warning signs. Call in a trusted HVAC technician before the issue becomes more costly (or dangerous).