Commercial

Commercial HVAC and Plumbing Experts Since 1978

Serving San Gabriel Valley, LA County, San Bernardino County, and the Inland Empire

McLay Services, Inc. provides dependable, high-quality heating, air conditioning, and plumbing solutions for a wide range of industrial, commercial, educational, healthcare, public facilities, and advanced technology clients. Our commitment to getting the job done right the first time and always providing excellent customer service has made us the trusted choice for thousands of commercial and residential clients in and near La Verne, San Dimas, Glendora, Rancho Cucamonga, Claremont, Upland, Chino Hills, Diamond Bar, Walnut, Azusa, Ontario, and Pomona.


We specialize in the design, installation, and service of Building Automation and Energy
Management Control Systems.


At McLay Services, we’re just as proud of the long-time relationships that we have built with our customers as we are of our reputation for being honest, dependable, and trustworthy. We keep an eye on our retention rate because this is one of the clearest indicators that we’re consistently delivering exceptional service that meets or exceeds customer expectations. As we get to know our commercial customers over time, we continuously look for ways to help our clients save time and money through increased energy efficiency, expert repairs and installations, preventative maintenance plans, and other personalized recommendations and solutions.

We provide a comprehensive range of plumbing and HVAC services and are specialists in building automation and energy management control systems. All of our work is performed by highly qualified technicians, who have finished rigorous training, have years of experience, and continue to receive ongoing training to keep them up to date on the industry’s latest best practices and new products and technology.

Click here for a complete list of our commercial plumbing, heating, ventilation, and air conditioning services. Call (909) 392-2202 to schedule service today. We’re available Monday through Saturday and do our best to accommodate after-hour and emergency service requests.

Family Owned & Operated HVAC & Plumbing Business

Family Owned & Operated Since 1978

McLay Services - 390+ Five-Star Reviews

Over 16,000 Satisfied Customers

43 Years of Experience

44 Years of Experience & Expertise

Carrier Factory Authorized Dealer

Carrier Energy Expert in Building Performance

McLay Services - Workmanship Guaranteed

Workmanship Guaranteed


Commercial Plumbing Services

Plumbing

  • Plumbing Service & Repair
  • Plumbing Installation
  • Hydro-Jetting Drain Lines
  • Leak Detection Specialists
  • Video Inspection
  • Slab Leak Specialists
  • Water Heaters
  • Tankless Water Heaters
  • Backflow Testing
  • Standard & Custom Fixture Installation
  • Water-Saving Fixtures: Faucets & Toilets
  • Drain & Mainline Cleaning
  • Copper Repiping
  • Gas Lines
  • Sewer Repair / Replacement
  • Pressure Regulators

Water Filtration & Softener Systems

  • Design & Installation
  • Maintenance
  • Service & Repair
  • Sediment Filters (sand)
  • Centrifugal Separators
  • Reverse Osmosis Filters

Backflow Prevention

  • Testing / Repairs / Service

Commercial Heating & Air Conditioning Services

HVACR Service, Repair & Installation

  • Air Conditioning
  • Boilers / Furnaces
  • Rooftop / Heat Pump Units (package)
  • Duct-Free Split System
  • Energy Saving Products & Services
  • Air Handlers
  • Cooling Towers/Evaporative Cooling
  • Make-up Air Units
  • Pneumatic / DDC Controls
  • Pumps
  • Variable Frequency Drives
  • Heat Recovery
  • Computer Room Cooling
  • Demand Control Ventilation
  • Garage Exhaust CO Monitoring Systems
  • Controls / Thermostats
  • Ventilation / Exhaust Fans
  • Filter Media Replacement (all media types)
  • Duct Work
  • VAV Boxes
  • Humidification
  • Air Balancing

Indoor Air Quality (IAQ)

  • Electronic Air Cleaner
  • Air Purifier / Humidifiers
  • Ultraviolet Germicidal Lamp
  • Carbon Monoxide Detectors
  • Duct Cleaning

Maintenance Programs

  • Preventative Maintenance
  • Predictive Maintenance
  • Custom Maintenance
  • Service Agreements

Commercial Speciality Services

  • Energy Management / DDC Controls
  • Design/Build
  • Tenant Improvement
  • Engineering Services
  • Project Management
  • Staff Training & Development
  • Mechanical Retrofits
  • Commissioning/Retro-commissioning
  • Variable Frequency Drives
  • Building Automation Systems
  • Energy Saving Products and Services
  • “Energy Star” Qualified

Recent Projects

Commercial AC & Heating Installation, Replacement Contractor

Special Offers & Rebates

We Pride Ourselves in Our Honesty, Integrity, and Professionalism

44
YEARS OF EXPERIENCE
16,000
SATISFIED CUSTOMERS
18
SERVICE AWARDS
416
FIVE-STAR REVIEWS

Customer Reviews

Google Reviews

McLay Services, Inc.

4.8 Stars - Based on 54 Reviews
Yelp Testimonials

McLay Services, Inc.

4.5 Stars - Based on 97 Reviews
Angi’s Reviews

McLay Services, Inc.

4.8 Stars - Based on 265 Reviews

Customer Reviews

CUSTOMERS ARE TRULY VALUED.

GREAT company, reliable professional service … Wonderful Family owned business. Customers are truly Valued. We ran a business in La Verne for 10 years. McLay has been our heating\AC\plumbing company the entire time. I have nothing but praise for the work they have done at a fair price with prompt reliable service. Thanks McLay!!!!!

Kaitlyn Adams Via Google Review

THEY MAKE YOU FEEL LIKE FAMILY

Wonderful family owned business with a wonderful staff. Very impressed!! Lucky enough to have been helped by the hands-on owners who help run the day to day process. They make you feel like family and took care of everything!

E Cotton Via Google Review

IT WAS GREAT TO DO BUSINESS WITH A QUALITY COMPANY

Had a small plumbing problem at my home. Mclay services was friendly, professional, efficient, accurate, quick response.

It was great to do business with a quality company like Mclay.

Mike L., Pasadena, CA Via Yelp Testimonial

DEFINITELY OUR #1 CHOICE FOR OUR A/C, HEATING AND PLUMBING NEEDS

McLay Services is a trust-worthy, dependable business providing quality work. Definitely our #1 choice for our A/C, heating and plumbing needs. Highly recommended, you will always get excellent service!!!

Fiona Salazar Via Google Review