Air Conditioner Maintenance & Tune-Ups

Improve Your AC Cooling Efficiency with an AC Tune-Up

We’ve seen it all when it comes to cooling across the Central Valley. From central AC systems to ductless air conditioning, we’ve tuned every type of air conditioner over the years. Our AC tune up knowledge is only part of the Cencal Mechanical experience. You can rely on us to be courteous and respectful of you and your living space. And we’ll get your home cool and comfortable with energy savings in mind.

Want to make sure your air conditioner is problem-free and ready for the hot months? Then schedule an Annual AC Tune-Up with Cencal Mechanical! Our AC specialists run diagnostics on your cooling system and tune your air conditioner for peak performance. Improve your AC energy efficiency and enjoy peace of mind knowing that potential cooling problems are fixed before the heat arrives.

100% Satisfaction

Parts & Labor Guarantees

5-Star Service

//Let Cencal Mechanical Improve Your Home Cooling Efficiency

Our HVAC maintenance technicians thoroughly inspect everything that helps your home cool most efficiently. Cencal Mechanical is experienced in optimizing both central AC and ductless air conditioning systems.

Our AC Tune-Up Includes:

  • Inspect thermostat operations
  • Inspect accessible return air grills
  • Flush condensate drain lines
  • Monitor freon levels
  • Monitor Compressor operations
  • Inspect & test all electrical safety controls
  • Inspect blower assembly
  • Wash condenser coils
  • Test all motors, capacitors & relays
  • Test, measure & record temperatures

AC Tune-Up FAQs

You can always contact our team with questions about HVAC installations, repairs, or maintenance. Here are some questions our customers often ask!

AC Tune-Up FAQs

Do I need to replace my air filters?

Yes, air filters must be periodically replaced in central and mini-split cooling systems. Ideally, this should be done every 3 months. Dirty air filters slow down airflow and reduce the efficiency of your equipment.


Why isn’t my air conditioner cooling?

If you’re not getting any cool air out of your home’s air conditioner, there are a few things you can check for:

  • Make sure there is power to your unit. Check your circuit breaker.
  • Ensure air filters are clean.
  • See if the coils are frozen over. If so, turn off the unit until they thaw.
  • Is the thermostat working normally? Try adjusting the temperature and wait for a change.

If AC issues are popping up consistently, it’s best to have a professional assess your unit. We’ll tune-up your air conditioner for peak performance.

Is my AC refrigerant low?

Refrigerant is the fluid inside your AC condenser unit that cools air passing through the system. When this fluid is too low, it can lead to an air conditioner that isn’t cooling! Look for these signs to spot low refrigerant:

  • Hissing or bubbling sounds from your AC unit.
  • Ice is forming on refrigerant lines.
  • Air is blowing, but it’s not cold.

Air conditioner tune-ups give our HVAC techs a chance to top up refrigerant levels. You don’t want to be caught without working AC on the hottest days! So help your cooling system with an annual tune-up.

When is the best time for AC maintenance?

Just as you would get an oil change and tune-up for your car before a big road trip, it’s best to get an AC Tune-Up before the heat waves start. When a technician inspects your air conditioning system, they ensure everything is working properly and ready for summer.

A service professional can suggest any repairs or upgrades to avoid AC emergencies when the heat is sweltering. So think about scheduling your AC Tune-Up in the spring or early summer.

The Cencal Mechanical Legacy

Why do we continue to grow and help more homeowners across California? Because we’re obsessed with HVAC services and care about every customer. Cencal Mechanical has installed thousands of air conditioners, furnaces, heat pumps, and water heaters. Our HVAC specialists are trained on all brands and manufacturers, so you can always call Cencal with confidence!

When Service Matters, We’re Here

When Service Matters, We’re Here

We’re proud of our 4.9-Star Rating and thankful for all of the local support we’ve received. Our relentless pursuit for excellence has led to lifelong relationships with homeowners who choose Cencal Mechanical.

No-Surprise Pricing

No-Surprise Pricing

Our specialists are experts when it comes to quoting the job. You’ll be given a total price for completed work before we start the job. There’s never a payment surprise when you choose Cencal.

Financing Support

Financing Support

We believe everyone deserves home comfort. Cencal mechanical offers financing on both heating and cooling equipment installations. Get comfortable when you need it most without breaking your budget.

Our Family, Your Neighbor

Our Family, Your Neighbor

Cencal Mechanical remains a family-owned and operated business with humble beginnings in Modesto, CA. We’re proud to have grown across the Central Valley, but our community values have never wavered.

In Modesto and throughout the Central Valley, our trucks are stocked and ready to help the communities we love. We’re the professional, reliable HVAC contractor who cares in California.

Contact Us Today

Contact Us Today

You can find our headquarters in Modesto, CA, just east of the Golden State Hwy at Woodland Ave.

1254 Lone Palm Ave
Modesto, CA 95351

(209) 720-4443

Cencal Mechanical Heating & Air Services

We specialize in delivering premium HVAC services to homeowners across the Central Valley.

When it comes to staying cool, keeping warm, and improving your indoor air quality, Cencal is your first call. Even if we didn’t install your air conditioner, don’t hesitate to call us!

Book Now

Become a Cencal Gold Member & Save

The Cencal Gold Membership gives you peace of mind knowing that your home is protected all year round. Members enjoy bi-annual maintenance on their home comfort HVAC systems. Join the most comprehensive Membership coverage in the industry. Members are insured against unexpected, costly repairs, and your home will never be without a functioning air conditioning system.

Enjoy the Cencal Gold Member Benefits

  • FREE Bi-Annual HVAC Tune-Up
  • 10% Off Parts for All Service Calls
  • NEVER Pay Diagnostic Fees
  • NEVER Pay for Overtime Labor
  • Front-of-the-Line Service for All Repairs & Maintenance

Learn More
Enjoy the Cencal Gold Member Benefits
AC Tune-Ups


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4.9 Stars From 200+ Reviews

“We have our bi-yearly HVAC unit serviced by Cencal. They do an excellent job, are very clean, and have a great attitude. The best part of the service we love is that if something goes out, day or night, weekend or holiday, they come out and fix it NO CHARGE. I call that pretty good insurance.”

David T.

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