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The Best Value for Heating and Air Conditioning Services in
Lake Forest, CA

For the best value in residential and commercial heating and air conditioning services in Lake Forest, call on McMaster Heating & Air Conditioning. As a licensed and family-owned HVAC company with over 40 years of experience, we are trusted by thousands of local homeowners, businesses, contractors, and property managers. They continue to rely on us because we consistently deliver exceptional workmanship, personalized customer service, and superior results at very competitive prices. We are a trusted Carrier Factory Authorized Dealer and 12-Time Winner of the Carrier President's Award, have won numerous awards from SDG&E and SCE for their rebate and quality assurance programs, and maintain an A+ rating with the Better Business Bureau.

Whole-Home Heating & Cooling Solutions for Lake Forest, CA

Whether you need an energy-efficiency upgrade for an outdated furnace, a ductless mini-split installation for your home office, or emergency repair services for a malfunctioning AC unit, McMaster Heating & Air Conditioning can provide a reliable, cost-effective solution to meet your indoor comfort needs and budget.

Our home heating and air conditioning services include:

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Reasons to Choose McMaster Heating & Air

Carrier Factory Authorized Dealer in Orange County Award-Winning Carrier Factory Authorized Dealer
Dedicated to Complete Customer Satisfaction Thousands of Satisfied Customers
Locally Owned HVAC Company Since 1996 Locally Owned, Licensed HVAC Company
We Employee NATE Certified Technicians We Employ NATE-Certified Technicians
Energy Efficiency Experts Efficiency Rating Guaranteed for All New Installs
Comprehensive 30-Point Inspection with Every Tune-Up Solutions Customized for Each Client’s Unique Needs & Budget
Expert HVAC Service & Repair Company Expert Service and Repair for All Makes & Models
Fast HVAC Service Within 24 Hours Fast Response Times - Often Within 24 Hours
Save Money with Special Offers & Rebates Up to Date with All Available HVAC-Related Rebates
Industry Leading Parts & Labor Warranties Industry Leading Warranties for New Installs & Repairs

Lake Forest's Local Carrier Experts

McMaster's Heating & Air Conditioning is proud to be a preferred Carrier Factory Authorized Dealer for Lake Forest home and business owners. As the inventor of the modern air conditioner, Carrier is recognized worldwide for its many advancements in innovative HVAC technology. Their product lines of Infinity®, Performance®, and Comfort® heating and air conditioning systems, ductless mini-split systems, indoor air quality products, humidifiers, and thermostats are highly prized for their high SEER ratings, durability, and quiet performance. As an authorized dealer, we offer our Lake Forest clients factory-direct access and substantial cost savings on all Carrier products we sell. In addition, every Carrier installation is backed by a 10-year parts limited warranty and comes with a 100% satisfaction guarantee for one full year.


Heater/Furnace and Air Conditioner Installations,
Replacements & Upgrades

We offer our Lake Forest clients FREE on-site consultations for new installations, replacements, and energy-efficiency upgrades. As part of our thorough design and installation process, we perform a detailed assessment of your current HVAC systems and indoor comfort preferences, then recommend the best HVAC equipment for your needs and budget. When necessary, we can also perform benchmarking load calculations and leakage testing to ensure that your system's equipment is correctly sized for maximum efficiency and cost savings.

Lake Forest's Heating and AC Repair & Service Experts

McMaster Heating & Air Conditioning is Lake Forest's best choice for prompt and reliable heating and AC repair services. Our experienced service technicians are certified by North American Technician Excellence (NATE) and receive ongoing training in the latest HVAC tools and technology. When troubleshooting and diagnosing your HVAC system, they begin with a thorough, multi-point inspection to get the source of the problem. Once the best repair solution has been agreed upon, they complete all services using the industry best practices to get your heater or AC unit running in optimal condition. Our honest recommendation and advice can be trusted to deliver the best HVAC repair service for your needs and budget, whether that means replacing a worn filter, repairing ductwork, or installing a new, more energy-efficient unit.

We Service All Major Makes & Models of HVAC Equipment

  • Carrier
  • Bryant
  • Rheem
  • York
  • American Standard
  • Fujitsu
  • Trane
  • Mitsubishi Electric
  • Daikin
  • Goodman
  • Lennox
  • And more!

Keep Your Lake Forest Home and Business Safe, Comfortable & Energy Efficient with Regularly Scheduled AC/Furnace Tune-Ups and Maintenance

Maintaining your HVAC system with regular tune-ups not only helps prevent system failure and avoid costly repairs but can also save you money on utility bills by improving energy-efficiency. At McMaster Heating & Air Conditioning, we recommend biannual maintenance for our residential clients, including spring A/C and fall heater tune-ups. Commercial clients might require quarterly or monthly maintenance services depending on their rate of usage and the model, year, and make of their HVAC equipment. Whatever your needs, our experienced service techs will perform a detailed multi-point inspection of your entire system that includes checking components, testing gas pressure, filter changes, lubricating parts, cleaning coils, and more.

Call today to speak to a team member who can advise you on the best maintenance schedule for your HVAC system.

Over 40 Years of Experience in Commercial HVAC System Design, Installation, and Maintenance Services

McMaster specializes in comprehensive commercial and industrial HVAC system services for Lake Forest businesses. Our owner, Ron McMaster, has over 40 years of hands-on experience and is an industry expert in heating and air conditioning systems, ventilation systems, and air purification systems. Whether you need a rooftop unit change-out for your church, a hospital-grade HEPA air filtration system for your school, or emergency A/C repair services for your industrial facility, we can provide a cost-effective solution that meets your needs and budget. We understand how important it is to minimize operational downtime for your business and always go out of our way to provide fast, reliable service that gets the job done within budget and on schedule. Click here to learn more about our commercial HVAC services, or give us a call today at (949) 481-7995.

We provide all of the below commercial and industrial HVAC system services to Lake Forest business:

  • Custom HVAC System Design & Installation
  • AHRI Efficiency Certificate & Efficiency Ratings
  • Ventilation System Design & Installation
  • Air Purification System Installation
  • HVAC Equipment Repairs & Replacement
  • HVAC Retrofitting for Tenant Improvements & Remodels

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Call Today for An On-Site Consultation at
Your Lake Forest Home or Business

Contact us today to speak to a member of our knowledgeable team, who can help you determine the best heating and cooling solutions for your needs. As a company, we are proud of our many awards and positive online reviews and remain dedicated to delivering complete customer satisfaction, exceptional workmanship, and operational excellence.


We Offer Free In-Home Estimates for New Installations


Click HERE to see all offers and rebates.

Customer Reviews

McMaster Heating & Air Conditioning Angi Reviews

McMaster Heating & Air Conditioning

4.9 Star Rated Angi Reviews 4.9 Stars - Based on 53 User Reviews
McMaster Heating & Air Conditioning Google Reviews

McMaster Heating & Air Conditioning

Google 4.9 Star Rating Reviews 4.9 Stars - Based on 70 User Reviews
McMaster Heating & Air Conditioning Yelp Reviews

McMaster Heating & Air Conditioning

4.6 Star Average Rating Yelp 4.6 Stars - Based on 88 User Reviews


We used McMaster to replace our HVAC and they were amazing. Our heater broke during the coldest part of the winter and the crew worked really hard to get the new system installed as quickly as they could. In fact, they stayed until 7:00 on New Year's Eve so that we would have heat on New Year's Day. The crew is great and all of Ron's leads are experts at what they do. We got several quotes and I feel like McMaster was the most honest in terms of what we needed, and we ended up saving money. Don't go anywhere else for your HVAC needs.

Christine M., Lake Forest, CA Via Yelp Testimonial


From the inital estimate appointment to the final completion, we were really happy with the service. Each person that came to our home was very knowledgable, professional. The job they did was great, clean and accurate. All the inspections we had after were passed the 1st time. We would highly recommend this company to our friends and family.

Jennifer S., Lake Forest, CA Via McMaster Heating & Air Conditioning Customer Lobby Reviews


I highly recommed McMaster Air and Heat. They are efficient, professional and have excellent follow thoughe. I was impressed with them from the first visit. The installation went very smooth and without a hitch.

Mani C., Lake Forest, CA Via McMaster Heating & Air Conditioning Customer Lobby Reviews

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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

McMaster is the only dealer in Orange County to receive
the prestigious Carrier President's Award 12 Times

  • 2010 Carrier President's Award Winner 2010
  • 2011 Carrier President's Award Winner 2011
  • 2012 Carrier President's Award Winner 2012
  • 2013 Carrier President's Award Winner 2013
  • 2014 Carrier President's Award Winner 2014
  • 2015 Carrier President's Award Winner 2015
  • 2016 Carrier President's Award Winner 2016
  • 2017 Carrier President's Award Winner 2017
  • 2019 Carrier President's Award Winner 2019
  • 2020 Carrier President's Award Winner 2020
  • 2022 Carrier President's Award Winner 2022
  • 2022 Carrier President's Award Winner 2024


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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