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 Since 1978
Over 16,000 Satisfied Customers
45 Years of Experience & Expertise
Carrier Factory Authorized Dealer
Carrier Energy Expert in Building Performance
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
Special Offers & Rebates
We Pride Ourselves in Our Honesty, Integrity, and Professionalism
Customer Reviews
McLay Services, Inc.
McLay Services, Inc.
McLay Services, Inc.
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 
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
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 
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
