Your air conditioner works hard to keep your home cool—especially during those long Texas summers. And while professional maintenance is essential, there’s a lot you can do on your own to help your system run efficiently, avoid costly repairs, and keep your space comfortable all season long.

At Delta Heating & Cooling, we believe in empowering our customers. That’s why we’ve created this guide: so you can take charge of your home’s comfort with a few simple tools, a little time, and the right knowledge.

Let’s dive into the top 7 DIY air conditioner maintenance tasks you can do to keep your AC system in peak shape—plus tips on when to call in the pros.

Why DIY AC Maintenance Matters

You don’t have to be an HVAC expert to help your system perform better. Just like changing the oil in your car or cleaning your gutters, basic AC upkeep helps you:

• Extend the lifespan of your air conditioner

• Improve cooling performance

• Lower your monthly utility bills

• Catch small issues before they turn into major problems

• Breathe cleaner, healthier air

And the best part? Most of these tasks take 10–30 minutes to complete.

1. Change or Clean Your Air Filters Regularly

Why It Matters:
Dirty filters are the #1 cause of airflow problems—and they force your AC to work harder, using more energy and wearing out faster. They also allow more dust, pollen, and allergens into your home.

How to Do It:
Locate your filter (usually behind a return air grille or in the furnace/air handler). Disposable filters should be replaced every 1–3 months, depending on use and indoor air quality. Reusable filters should be removed and washed with water, dried, and reinstalled.

Pro Tip:
Set a recurring reminder on your phone or calendar so you never forget. If you have pets, allergies, or live in a dusty area, change your filters more often.

2. Clear Debris Around the Outdoor Unit

Why It Matters:
Your outdoor condenser unit needs space to breathe. Leaves, grass clippings, and debris can block airflow and reduce cooling efficiency. If airflow is restricted, the system can overheat or cycle improperly.

How to Do It:
Turn off the power to your AC system (there’s usually a disconnect box nearby). Gently remove leaves, branches, and dirt from around the unit. Use a hose (on low pressure) to rinse away buildup on the coils.

Keep at least 2–3 feet of clearance around the unit at all times.

Pro Tip:
Avoid placing plants, fencing, or furniture too close to your outdoor condenser. Shading the unit can improve efficiency—but don’t crowd it.

3. Check and Clean the Condensate Drain Line

Why It Matters:
Your AC doesn’t just cool—it removes humidity from the air. That moisture drains out through a condensate line. If the line gets clogged with algae or debris, it can back up and cause leaks or water damage.

How to Do It:
Find the white PVC pipe near your indoor unit (usually next to your furnace or air handler). Use a shop vac to suck out debris from the outside drain opening, or pour a cup of white vinegar into the drain every 1–2 months to help prevent clogs.

Pro Tip:
If you notice water pooling near your indoor unit or your AC shuts off suddenly, a clogged condensate line might be the culprit.

4. Inspect Your Thermostat Settings

Why It Matters:
Sometimes the issue isn’t with your AC—it’s with your thermostat. Incorrect settings, weak batteries, or faulty programming can cause your system to short cycle, run non-stop, or struggle to reach the right temperature.

How to Do It:
Double-check your thermostat mode (cool vs heat), and ensure the temperature is set correctly. Replace batteries yearly if it’s not hardwired. For programmable or smart thermostats, review the schedule to match your daily habits.

Pro Tip:
Upgrading to a smart thermostat can improve comfort and cut energy costs by automatically adjusting temperatures when you’re asleep or away.

5. Gently Clean the Evaporator Coil

Why It Matters:
Your indoor evaporator coil absorbs heat from your home. If it’s coated in dust, airflow is restricted, cooling is reduced, and your system has to work harder.

How to Do It:
Turn off the system. Open the access panel near the indoor unit to locate the coil (you may need a screwdriver). Use a soft brush or coil cleaning spray (available at hardware stores) to gently remove dust and buildup.

Pro Tip:
If the coil is heavily clogged or you’re unsure how to access it safely, call a professional HVAC technician to clean it during a maintenance visit.

6. Make Sure All Vents Are Open and Unblocked

Why It Matters:
Blocked or closed supply and return vents can create pressure imbalances in your system, reduce airflow, and cause rooms to cool unevenly—or not at all.

How to Do It:
Walk through each room and check your floor, wall, or ceiling vents. Remove dust with a vacuum and ensure furniture, rugs, or curtains aren’t blocking airflow.

Pro Tip:
Don’t close vents in unused rooms—it doesn’t save energy and can actually put strain on your system. Instead, ask about zoned systems or ductwork upgrades if you need better control.

7. Listen for Strange Noises

Why It Matters:
Your AC system will make a gentle hum during normal operation—but if you hear banging, grinding, squealing, or rattling, that’s a red flag.

How to Do It:
Take a few minutes each month to listen to your system while it runs. Unusual sounds could signal loose parts, worn belts, debris in the fan, or motor issues.

Pro Tip:
Don’t ignore strange noises. They can lead to bigger issues fast. Turn the system off and call Delta Heating & Cooling for a professional inspection.

Bonus Tip: Know When to Call the Pros

While DIY maintenance is powerful, there are times when professional HVAC service is a must. Call in the experts if:

• Your system won’t turn on or cool

• You see ice on the coils or lines

• You smell burning or musty odors

• There’s water leaking near the unit

• Your energy bills have spiked

• You haven’t had a tune-up in over a year

At Delta Heating & Cooling, we offer affordable maintenance plans that include seasonal tune-ups, performance checks, filter replacements, and priority service for emergencies.

How Professional Maintenance Complements DIY Care

Think of your DIY efforts as daily hygiene—like brushing your teeth. Professional maintenance is the deep clean and check-up that keeps everything running smoothly long-term.

Here’s what our HVAC technicians check during a professional service visit:

• Refrigerant levels and pressure

• Electrical connections

• Fan motors and belts

• Capacitor performance

• Thermostat calibration

• Full system cleaning and tuning

Together, your efforts and our expertise create the perfect partnership for reliable, efficient comfort.

What Our Customers Say About AC Maintenance

“I started changing my filters regularly and cleaning the unit like Delta recommended, and I’ve seen a huge drop in energy use. Plus, their team caught a small refrigerant issue before it got worse. Worth it!” – Sarah M., Leander

“We had no idea our drain line was clogged until water started leaking. Thankfully, the team walked us through how to keep it clear. Great customer care!” – Joel P., Austin

“They taught me so much about keeping our unit in shape—and now I feel like I’m finally in control of our home’s comfort.” – Denise R., Round Rock

Stay Comfortable and Confident Year-Round

Taking care of your AC doesn’t have to be overwhelming. With a few simple monthly habits, you can protect your investment, enjoy cleaner air, and feel more in control of your home’s comfort.

At Delta Heating & Cooling, we’re always here to guide you—whether it’s walking you through your first filter change or providing expert tune-ups when you need them.

Have questions about your AC system or want to schedule professional maintenance? We’re just a call away.