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All Pro Plumbing, Heating, Air & Electrical is your go-to HVAC expert. Specializing in extensive cooling devices and components, we are able to recommend the best HVAC equipment to meet your unique needs. In many cases, residential and commercial properties alike benefit from the use of a makeup air unit. These systems help improve efficiency and work effectively in instances where a traditional air handler is not appropriate.

Enjoy savings and efficiency with a makeup air unit from All Pro Plumbing, Heating, Air & Electrical. Our makeup air units in San Bernardino County are perfect for your cooling needs. Call (909) 500-8193 to schedule an appointment for more information today.

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  • Special Offer


    AC Tune Up Special


    Cannot be combined with other offers.
    Valid from April 1, 2024 – June 30, 2024.

  • Special Offer

    $1000 OFF


    includes a 1 year service agreement,
    and an air filtration system (air scrubber)

    *Valid only March 14-31, 2024.
    Must present offer to technician at appointment.



Cannot be combined with other offers. Valid from April 1, 2024 – June 30, 2024.

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All Pro Smart Membership

Experience Peace of Mind, Discounts, & More Even the best HVAC, plumbing and electrical systems need recurring maintenance to keep them running perfectly. With the All Pro Smart Membership, you can rest assured that your home’s HVAC, plumbing and electrical systems won’t fail – especially when you need them the most!

  • Enjoy all member benefits for only $19.99/month!
  • Four Tune Ups Per Year. Value: $556.
  • No Breakdown Guarantee
  • 100% Money Back Guarantee
  • No Dispatch Fees. Value: $139
  • 15% Off Service Repairs
  • Priority Service. Value: $139
  • Credit Towards Investment. Value: Up to $500
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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 as one of the best plumbers in the area.

Personalized Options

  • Community Service

  • Fast Response Time

  • Problem Solved the First Time

  • Personalized Option

  • FREE Estimates*

  • Our Core Values

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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

What Is a Makeup Air Unit?

A makeup air unit (MUA) is a type of air handler that uses 100% outdoor air rather than recirculating air. They are gaining popularity with building managers because they are known for maintaining a high indoor air quality for the building’s interior. As indoor air quality becomes a top priority for building owners, HVAC systems that are designed to improve air quality are going to become more popular.

When Would You Use a Makeup Air Unit?

Although makeup air units are good for maintaining high indoor air quality, they should not be used in every instance. For example, the energy used in an MUA compared to a traditional air handler is a little more, making these units marginally more expensive to operate. However, there are numerous instances where an MUA is best suited.

Some of the most significant uses for them include:

  • If you use a water-source heat pump in your home, an MUA is best to circulate the air
  • In industries where fresh, clean air is always required such as surgical operating rooms, restaurant kitchens, and manufacturing booths
  • When the HVAC system does not have the proper means to introduce fresh air
  • Apartment buildings or buildings zoned for multiple uses would also benefit from an MUA

Learn more about this type of cooling system and if a makeup AC unit in Ontario might benefit you—contact All Pro Plumbing, Heating, Air & Electrical today!

Call (909) 500-8193 today to speak with one of our Ontario HVAC specialists.