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To make sure your home or business’s AC operates at peak performance, you should keep your cooling system in top shape. When you need AC maintenance services in San Bernardino County or throughout the surrounding areas, All Pro Cooling, Heating, Plumbing & Electrical is just a call away. Our Ontario-based HVAC team can troubleshoot and diagnose specific issues you are experiencing or advise you on best practices to maintain your AC system. We also offer repair and installation services.

Our Air Conditioning Maintenance Checklist in Ontario, CA

Taking great care of your AC isn’t just about avoiding breakdowns—it’s about comfort, energy savings, and peace of mind. Here’s what our trained technicians look out for during a typical AC maintenance visit in Ontario, CA:

Thermostat Calibration

We check if your thermostat is reading temperatures accurately and syncing with your AC system. A miscalibrated thermostat can lead to uneven cooling, higher energy costs, and unnecessary wear on your unit. We’ll recalibrate it if needed to make sure your home feels just right. We also replace, install, and service thermostats of all sorts in Ontario, CA and the nearby areas.

Inspecting and Cleaning the Evaporator Coil

Dust, grime, and debris can coat your evaporator coil over time, making it harder to cool your air. We gently clean the coil and inspect it for any corrosion or damage. A clean coil means a smoother-running unit and better airflow throughout your home or business.

Checking Refrigerant Levels

Low refrigerant is one of the most common signs of trouble, and often points to refrigerant leaks. We measure the levels and look for signs of leaks. If your AC isn’t cooling like it used to, this step could reveal why. We’ll make sure your unit is charged correctly.

Tightening Electrical Connections

Loose wires or worn connections can be a serious safety hazard—and a common culprit behind unexpected breakdowns. We go over all electrical components carefully, tightening anything that’s come loose and replacing worn parts before they become a problem.

Lubricating Moving Parts

Friction is the enemy of efficiency. We lubricate motors, fans, and other moving parts in your AC unit to prevent wear and tear, reduce strange noises, and keep everything running smoothly with minimal disruption to your daily life.

Clearing the Condensate Drain Line

A clogged condensate line can lead to water leaks, mold, or water damage around your AC system. We flush out the line to prevent backups and make sure everything is draining properly. It’s a small detail that can save you big on costly repairs later.

These essential steps are part of what makes our AC maintenance service so reliable. It’s all about catching issues early, preventing further damage, and keeping your air conditioner in top shape year-round.

Air Balancing

Air balance is one aspect of your HVAC system that determines whether or not the unit is working at peak efficiency. That’s why it’s pretty high on our air conditioning maintenance service list. A building that has been balanced has equal airflow and conditioning in every room, ensuring that the temperature throughout is consistent. To balance a building, our technicians will test the ducts and airflow to create a baseline and then make small adjustments before retesting. This goes on until the airflow has been balanced.

Duct Cleaning and Duct Repair Is Also On Our Service List

Your ducts are the unsung heroes of your HVAC system. If they’re leaky, dirty, or poorly sealed, your air conditioner has to work overtime, meaning higher energy costs and less comfort. Our team offers professional duct cleaning and duct repair services to help restore proper airflow, boost energy efficiency, and keep your indoor air quality fresh and healthy. Whether it’s sealing gaps, removing dust buildup, or fixing a damaged section, we’ve got your back.

How Long Does an AC Maintenance Session Last?

Typically, a full AC maintenance visit takes about 60 to 90 minutes. The exact time depends on the size of your system, how accessible components are, and if we spot any issues that need extra attention. We always aim to be thorough without wasting your time. Our goal? Deliver a complete, top-to-bottom check-up that leaves your cooling system humming without disrupting your day. If repairs are needed, we’ll discuss your options on the spot and even offer a free estimate if further service is required.

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$500 OFF

$500 Full Heating & Air Conditioning System

Coupon only valid on Deluxe and above packages. Excludes1 year service agreement and filtration system. Cannot be combined with other offers. Valid from July 1, 2025 – September 30, 2025

$49

Electrical Safety
Evaluation

Cannot be combined with other offers. Valid from July 1, 2025 – September 30, 2025

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BRING IN THE BEAR

The ALL PRO Membership

As an ALL PRO Member, you’re backed by the beary best guarantees, offers, & priority scheduling.


Optimize performance, lower energy bills, prevent costly repairs, preserve warranties & experience peace of mind. All is paw-sible as an ALL PRO member.

  • PRIORITY SERVICE SCHEDULING Get scheduled ahead of non-members when you need a diagnostic service call.
  • 4 TUNE-UPS PER / YEAR A certified technician will tune up your cooling, heating, plumbing & electrical systems.
  • NO BREAKDOWN GUARANTEE We guarantee your system will not break down within six months of service. In the rare chance a breakdown does occur within six months of services, we will waive all dispatch & diagnostic fees, & apply a $100 credit towards any repair needed.
  • 15% OFF SERVICE REPAIRS As a member, get 15% off service repairs & indoor air quality products
  • CREDIT TOWARD INVESTMENT 100% of your membership fees (up to $500) can be credited towards a replacement.

Thousands in Value for Only

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YEARS OF
EXPERIENCE

Since 1991

Top-Rated Plumbing, HVAC & Electrical Services

We remain steadfast in our commitment to providing outstanding customer service and tailoring our solutions to meet our customer’s unique circumstances. We take the time to understand your specific needs, as well as your budget, working closely with you to ensure that your problem is resolved efficiently and effectively the first time.

It’s because of our care for our customers that we have earned the 2020 Best of HomeAdvisor award and been awarded by Expertise.com as one of the best plumbers in the area.

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Thousands of Happy Customers

Was very happy with the quick response to my call for help. It was a very good experience even though it was a stressful situation. They worked with me and were empathetic to my problem and my limitations. They were very thorough in explaining the situation and what needed to be done, explaining and showing me the problem. Once it was decided what I had to do they were quick to get to work and completed the job in a very timely manner. All in all it was a stressful but good experience

– Susan C.

All Pro was awesome we called and they came the same day when our shower drain was leaking into our downstairs ceiling…..the service person was so nice and was very fast and very professional. The price was very reasonable and affordable. They did an outstanding job and we would recommend this company for all your servicing needs. This is the second time using this company, the first was for our water heater and they replaced it fast and very affordable the same day. They came at around 5 and was here until around 9 fixing not only our leaking shower drain but our water pressure value needed to be replaced. They did both and I do not think we would have gotten a better deal or a nicer person to come and do the repairs. All Pro is definitely the people we will be calling for all our plumbing, heating and air conditioning needs from now on.

– Pamela M.

They came to our rescue on January 8, 2018. we had a clogged toilet that overflowed all the way to the downstairs bathroom it was a horrific scene that day. That is when we decided to call All Pro Plumbing. Talked to a nice lady on the phone gave her our info and told us would call back to ensure us someone would come out to help. Within minutes gave us a response time and told us someone will be there within the hour. Sure enough that is when they showed up and quickly diagnosed the problem, went to work, and unclogged whatever was in there that needed to be unclogged. They were efficient, respectful, and professional. They also checkout out other things to make sure that toilet was working fine before they left. Great customer service!

– Vincent M.

Gary was absolutely amazing today. He was friendly, knowledgeable! It seemed a little pricey but our problem needed to be addressed immediately. Great customer service. I would definitely recommend!

– Danielle O.

I would recommend ALL PRO Plumbing to anyone that is looking for good professional service. They installed a sink and garbage disposal for me and did a great job. Their response time is quick. Always either the same day, or the next day

– Chris H.

Additional Resources

Economizers

AC Filters

How Often Should an Air Conditioner Be Serviced?

Is There Any AC Maintenance That I Can Do Myself?

How Often Should AC Filters Be Replaced?

How Do I Know My Air Conditioner Needs Refrigerant?

Can Regular Air Conditioner Maintenance Help With Energy Costs?

Economizers

Economizers are devices that make your HVAC system more efficient. They help save energy costs by using air from outside to cool indoor air, gauging when the outside air temperature and humidity are cooler than the inside air.

Economizers can provide the following benefits:

  • Savings on your energy bill
  • Reduced carbon footprint
  • Improved indoor air quality

Our expert technicians will happily review your circumstances to determine if an economizer is right for your building.

AC Filters

If you are noticing increased allergy symptoms in your home or rising energy bills, it may be time to replace your AC air filter. An air filter is designed to trap dust, allergens, debris and other airborne pollutants before they enter your air conditioning system. A new filter will not only improve the air quality in your building, but will prevent unexpected breakdowns within your air conditioner and the whole AC system and improve the unit’s efficiency. Our All Pro Cooling, Heating, Plumbing & Electrical technicians can determine whether you need a new air filter, and will handle the installation, all at a great price with friendly service.

How Often Should an Air Conditioner Be Serviced?

We recommend scheduling regular maintenance at least once a year, preferably in the spring, right before the heat hits. If your AC system works overtime (like most do here in Southern California), consider servicing it twice a year. This helps catch small problems early before they snowball into big, expensive ones. It also keeps your system running efficiently, improves indoor comfort, and helps prevent emergency repairs in the middle of a heatwave.

Is There Any AC Maintenance That I Can Do Myself?

Absolutely! There are a few simple things you can do between visits to keep your AC unit happy. For starters, change or clean your air filters regularly. You can also clear away debris around your outdoor unit, check for unusual noises, and make sure your vents aren’t blocked by furniture. These small efforts go a long way in keeping your system efficient and reducing the need for AC repair.

Another handy tip? Pour a bit of vinegar into your condensate drain line every few months to help prevent clogs and mold. Also, keep an eye on your thermostat settings to avoid overworking your unit. Just a few minutes every month can help you avoid costly repairs and keep your air conditioning running smoothly all season long.

How Often Should AC Filters Be Replaced?

For most households, replacing the AC filter every 1 to 3 months is ideal. If you have pets, allergies, or live in a dusty area like Ontario, CA, monthly changes are your best bet. A dirty filter makes your system work harder, reduces airflow, and can lead to higher energy costs, not to mention more strain on your AC unit. A clean filter helps maintain good indoor air quality and keeps your cooling system running efficiently.

How Do I Know My Air Conditioner Needs Refrigerant?

There are a few common signs that your system might be low on refrigerant. If your AC blows warm air, takes forever to cool a room, or you hear hissing noises, it could point to refrigerant leaks. Ice buildup on the evaporator coil is another red flag. And if your energy bills are spiking for no clear reason, that’s also worth checking. Our technicians can run diagnostics and let you know exactly what’s going on—no guessing games.

Can I Add Refrigerant to My AC Unit Myself?

Short answer: no, and it’s really not safe. Adding refrigerant requires EPA certification, and it’s not as simple as topping off fluids. Too much or too little refrigerant can seriously damage your unit. Worse, you could end up causing further damage or masking a bigger issue, like a refrigerant leak. Our licensed HVAC technicians are trained to spot these issues, handle the right type of refrigerant for your model, and recharge your system safely and correctly.

Plus, certain refrigerants are being phased out and replaced with newer, more eco-friendly options. Using the wrong type can void your warranty or damage your system. If your AC isn’t cooling like it should, don’t take chances—call us for a thorough inspection. We’ll make sure your cooling system gets exactly what it needs, with minimal disruption to your comfort.

Can Regular Air Conditioner Maintenance Help With Energy Costs?

Definitely. A well-maintained air conditioner runs more efficiently, meaning less wasted energy and lower bills. When components like the evaporator coil or filters are clean and airflow is unobstructed, your unit doesn’t have to work as hard. Plus, regular maintenance helps keep your SEER (Seasonal Energy Efficiency Ratio) rating closer to what your unit was designed for. That translates to long-term energy efficiency, better comfort, and fewer costly repairs down the line.

If you’re in Ontario or anywhere in San Bernardino County and need AC maintenance, repair, or other home services, don’t wait until you’re stuck in the heat. Book your appointment online or give our friendly team a call for a free estimate—we’re here to help with reliable, expert care.

System Performance Testing

There are several performance tests that help our technicians improve the efficiency and comfort levels of your HVAC systems.

Some of these tests include:

  • Airflow Testing: This test ensures that airflow is moving efficiently throughout your home and there are no blockages or disruptions in the system.
  • Energy Efficiency Testing: Using special calculations, we are able to determine if your cooling system is working efficiently. The goal is to produce the highest amount of energy at the lowest cost for you.
  • Indoor Air Quality Testing: If the air quality in your building is not optimal, you will experience increased allergy symptoms and other adverse effects. We run tests to make sure that your indoor air quality is the best it can be.

Contact All Pro Cooling, Heating, Plumbing & Electrical at (909) 500-8193 when you need AC maintenance in Ontario and beyond! Also, don’t hesitate to call us for all your AC repair and AC installation needs!