HVAC Installation
Design-build and new construction projects — from tenant improvements to full commercial campuses. Engineered for performance and longevity.
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Serving Southern California Since 1991
Your Comfort
Is Our Passion™
Southern California's most trusted commercial HVAC contractor — delivering engineering-grade solutions for installation, service, automation, and energy sustainability across LA, Inland Empire, Orange County, and San Diego.
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Active Properties
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What We Do
Full-Spectrum Commercial HVAC Solutions
From design-build to tenant improvements, new construction to retrofit — ACS delivers the complete suite of mechanical services your commercial property demands.
Service & Maintenance
Preventative maintenance programs and 24/7 emergency repair services. Fully-staffed technicians keep your systems running at peak efficiency.
Learn MoreBuilding Automation
Smart building control systems that optimise comfort, reduce energy waste and give facility managers real-time visibility over every zone.
Learn MoreMechanical Piping
Full mechanical piping installation and service for commercial and industrial facilities — designed, fabricated, and installed to code by ACS-licensed teams.
Learn MoreEnergy Sustainability
LEED-certified energy solutions and SCE Gold Partner expertise to lower your operating costs, reduce your carbon footprint, and meet sustainability goals.
Learn MoreUnit Replacements & Retrofits
Ageing equipment replaced with high-efficiency modern systems — minimum disruption, maximum performance, and full project management from start to finish.
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Why Choose ACS
A Quarter Century of Keeping Our Promises
ACS stands for more than Air Control Systems — it's our commitment: Always Customer Service. Since 1991 we've built Southern California's most responsive, fully-staffed commercial HVAC team.
C-20 Licensed & Fully Insured
California C-20 HVAC license, fully bonded and insured — protecting you on every project, every time.
24/7 Emergency Support
Round-the-clock emergency HVAC service. Call 909-786-4700 and a technician will be dispatched immediately.
NATE-Certified Technicians
Every technician holds NATE certification — the gold standard for HVAC technical competency in the industry.
SCE Gold Rooftop Partner
Recognised by Southern California Edison for delivering high-efficiency energy solutions that reduce costs and meet sustainability goals.
NATE
LEED
ABC SoCal
NAIOP
SCE Gold
C-20
Client Reviews
What Our Clients Say
Trusted by thousands of commercial property owners and facility managers across Southern California.
"These are go-to guys… it's nice to hire a subcontractor that's problem-free. The installation on our 200,000 sq ft office park was flawless — on time, on budget."
"ACS has been maintaining our 14-building industrial campus for 6 years. Zero unplanned downtime since we switched. Their NATE techs know these systems inside and out."
"The building automation system ACS installed cut our energy bill by 23% in the first year. The real-time dashboard is a game-changer for our operations team."
"Saturday afternoon at 110°F and our rooftop unit failed. ACS had a tech on-site within 90 minutes. Back up and running before the evening shift. Absolutely outstanding."
"ACS guided us through the SCE rebate programme and delivered an energy-saving retrofit that achieved LEED Gold on our campus. The ROI was clear within 18 months."
"Replaced 22 rooftop units across our 5-property portfolio in under 3 weeks. Immaculate project management. The new systems run quieter and have already improved tenant satisfaction scores."
Reviews sourced from Google Business Profile
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Tell us about your project and our expert team will respond within one business day with a detailed proposal. No obligation.
Emergency: 909-786-4700
1940 South Grove Ave., Ontario, CA 91761
Mon–Fri: 7:00 AM – 5:00 PM | 24/7 Emergency
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