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Award-Winning HVAC Contractor Serving Orange County Since 1996

Carrier President’s Award

10-Year Winner of the Carrier President's Award

Service All HVAC Makes & Models

HVAC Design and Installation Experts

Tenant Improvements & Efficiency Retrofits

Tenant Improvements & Efficiency Retrofits

Expert HVAC Service & Repair Company

Service & Repair for All Makes & Models

AHRI Air Conditioning Heating Refrigeration Institute

AHRI Efficiency Certificates Included

Comprehensive 30-Point Inspection with Every Tune-Up

Comprehensive Maintenance Plans

Orange County's Preferred Commercial HVAC Contractor Since 1996

McMaster Heating & Air Conditioning provides Orange County with exceptional commercial and industrial heating, air conditioning, and ventilation services at competitive prices. Since 1996, we have earned an excellent reputation amongst thousands of business owners, property managers, and contractors throughout Irvine, Newport Beach, Mission Viejo, Rancho Santa Margarita, and surrounding areas. They trust us because we always deliver reliable results that consistently meet and exceed their expectations for high-quality products, meticulous workmanship, and superior customer service. We are a ten-time winner of the prestigious Carrier President's Award and have also earned numerous awards from SDG&E and SCE for their rebate and quality assurance programs.

Our commercial and industrial HVAC services for Orange County include:

  • HVAC System Design & Installation, including AHRI Efficiency Certificate
  • HVAC System Inspection, Service & Repair
  • Rooftop Units, Packaged Units, and Heat Pumps (up to 40 tons)
  • Ventilation System Design & Installation
  • Air Purification System Installation
  • HVAC Equipment Replacement & Repairs
  • HVAC Retrofitting for Tenant Improvements & Remodels
  • Custom Fan Coil Unit Installation
  • J/S/D Load Calculations
  • Exhaust Fans, Ducts, and Roof Ventilators
  • Sheet Metal Ducting Design & Installation
  • HVAC System Maintenance - Biannually, Quarterly, Monthly
  • Ductless Mini-Split Design & Installation, Repair & Maintenance

Call Today to Learn More

Customer Reviews


Overall very happy with McMaster Heating and Air Conditioning. One of the reasons I chose them was they are a family owned/run business and they specialize in Carrier products. With that I feel that I have gotten the personal responsiveness of a family run business. The owner, Ron, came out to my house and gave a very detailed explanation of what he recommended and why. The installation team did a great job overall too. There were a few tweaks that had to be done and they have taken care of them with no problems. So far everyone I have interacted with has been great. I had a minor issue and one of their technicians Anthony came out on a holiday and squeezed me in so I wouldn't have to wait the full weekend. Would definitely recommend especially if you are planning to install Carrier products.

Jason M., Cypress, CA Via Yelp Testimonial

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Extremely professional organization. From the first service call to verify that my existing system was not worth the sales manager (Christian) who walked me through the options and answered my late night email questions...all the way thru the crew who meticulously removed my old equipment and had the new system up and running in less than 2 days (complete new A/C, furnace and ducts), everyone at McMaster (including the owner Ron who stopped by numerous times to ensure everything was going to my satisfaction) was top notch. If you need service or an entire new system, don't hesitate to call McMaster. Fair prices and expert knowledge. Highly recommended A+++

Steven Scapellati Via Google Review

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Comprehensive Commercial & Industrial HVAC Design &
Installation Services

At McMaster Heating & Air Conditioning, we are experts at designing and installing custom HVAC systems for commercial and industrial buildings of nearly any size, including warehouses, churches, manufacturing plants, industrial facilities, retail stores, offices, and more. Our owner, Ron McMaster, has over 40 years of industry experience and specializes in commercial and industrial HVAC services. Just a few of our current and former clients include prominent names such as 7-Up Bottling Company, Jurgens, and Sunkist. We not only use the industry's best practices for design and installation but are also highly experienced in completing J/S/D load calculations to properly size equipment and ductwork to achieve maximum efficiency. Every system we sell and install comes with an AHRI Efficiency Certificate that includes an exact HVAC efficiency rating, which can be used to satisfy proof of compliance with AQMD air quality requirements.

HVAC Replacements, Upgrades & Energy-Efficient Retrofitting for Tenant Improvements & Remodels

McMaster Heating & Air Conditioning is Orange County's best choice for efficiency retrofits, tenant improvements, and remodels, and commercial HVAC replacements and upgrades. Whether you need a ventilation system upgrade at an industrial facility, rooftop unit change-out at a manufacturing plant, or ductless mini-split system installation for server rooms, we have the skills, knowledge, and expertise to get the job done on time, within budget, and to the highest standards of excellence. We are also experts in custom fan coil design and modular unit installation, sheet metal ducting design and installation, and exhaust fans and roof ventilators.

Commercial Indoor Air Quality Products and Air Purifiers, Including the Carrier OctiCleanTM

As Carrier Factory Authorized Dealers, we offer factory-direct access to their full product line of innovative air purification systems, including Carrier’s Infinity® Air Purifier® and the Carrier OctiClean™ portable commercial air scrubber and negative ion machine. Ideal for nearly any commercial building, the Carrier OctiClean air purification system can be rolled easily into any room and is efficiently powered with a standard electrical outlet. We also sell and install the iWave air purifier, which integrates seamlessly with nearly any brand of HVAC system to quickly and effectively improve indoor air quality by eradicating evaporator coil bacteria.

View Our Carrier Product Catalog for Product Specs

We Provide Prompt, Reliable HVAC System Service & Repair for All Makes and Models

McMaster Heating & Air Conditioning provides Orange County businesses with fast, reliable, and cost-effective HVAC repair services that get the job done while minimizing operational downtime. Our experienced, NATE-certified technicians receive ongoing training in the latest HVAC technology and are extremely knowledgeable and skilled in troubleshooting and repairing all makes and models of commercial heating and air conditioning systems. Our goal is to provide a fast response within 24 hours, accurately identify and diagnose the problem, and deliver excellent HVAC repairs that get your system running in optimal condition as soon as possible. We always go out of our way to help our commercial clients find the most efficient solution for their operational needs, budget, and schedule.

Comprehensive Maintenance Agreements for Orange County Commercial & Industrial Businesses

Most commercial heating and air conditioning systems benefit from frequent tune-ups and filter changes in order to maintain healthy indoor air quality and efficient operation. Most schools, for example, require filter changes every 30 days. When you enroll your business in a commercial maintenance agreement with McMaster Heating & Air Conditioning, you can expect that we will start by evaluating your usage to determine the most beneficial maintenance schedule for your system. Whether you choose a quarterly, biannual, or monthly maintenance plan, you will receive a thorough and detailed multi-point inspection that includes changing filters, checking components, testing gas pressure and amp draws, lubricating parts, cleaning coils, and more.

Call Today For a Free On-Site Consultation & Competitive Quote Anywhere in Irvine, Newport Beach, Mission Viejo, Anaheim, and Surrounding Areas

Give us a call today to speak to a member of our knowledgeable staff. We answer our phones Monday - Friday, from 8:00 am - 5:00 pm, and Saturday 9:00am - 2:00pm. We also have a service technician on call for 24/7 commercial HVAC emergency services. For new installations and unit replacements, we offer free on-site estimates for commercial businesses throughout Orange County, including Irvine, Newport Beach, Mission Viejo, Rancho Santa Margarita, Yorba Linda, Laguna Niguel, Anaheim, and surrounding areas.

Factory Authorized Carrier Dealer - McMaster Heating and Air Conditioning Carrier Certified Health Air Expert NATE Certified HVAC Technicians NCI National Comfort Institute, Inc. Ozone-Friendly Puron Refrigerant TECH Clean California Energy Solutions
Commercial HVAC System Design & Installation Services Irvine

Recent Projects

We installed this Carrier rooftop unit in a commercial building in Orange County. We have over 40 years of experience in commercial and industrial HVAC system design and installation services, including tenant improvements and energy-efficiency retrofits.

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Proudly Serving All of Orange County

  • Aliso Viejo
  • Anaheim
  • Brea
  • Buena Park
  • Costa Mesa
  • Coto De Caza
  • Cypress
  • Dana Point
  • Dove Canyon
  • Foothill Ranch
  • Fountain Valley
  • San Juan Capistrano
  • Santa Ana
  • Seal Beach
  • Southern California
  • South Orange County
  • Stanton
  • Tustin
  • Villa Park
  • Westminster
  • Yorba Linda
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