Honest work, fair pricing, no upselling. We install, repair, and maintain HVAC systems for homes and commercial properties across Southern California — and we treat every job like it matters.
Commercial properties, multi-tenant buildings, single-family homes — same team handles the design, the install, and the ongoing service. Nothing gets handed off to a subcontractor you've never met.
Most requested
New construction, retrofits, and full system replacements — sized, designed, and installed to meet today's efficiency standards.
Explore replacements
24/7 service
Fast, accurate diagnostics and lasting repairs on every major brand. We carry the most common parts on the truck.
Explore repairs
Plans available
Preventive service plans for commercial fleets and residential systems — extend equipment life and cut utility bills.
Explore maintenanceAlso doing ductwork, boiler service, and 24/7 emergency response — plus 7 commercial industries.
ADA Mechanical was built on a simple idea: show up when we say we will, and stand behind the work. Same standard whether we're swapping out a rooftop unit on a commercial property or installing a brand-new system in your home.
Anyone can sell you a system. The hard part is making sure it runs well for years, and that someone qualified shows up fast when it doesn't.
We answer the phone, dispatch fast, and keep you in the loop. You won't be left wondering what's happening with your service call.
Permits pulled when required. Loads calculated. Refrigerant charged correctly. The boring stuff that determines how long a system lasts.
Itemized proposals with no surprise upcharges. We explain the trade-offs so you can choose the option that fits your building and your budget.
Direct line to the people doing the work. Scheduled maintenance and digital service reports for commercial accounts; clear explanations and respectful crews for homeowners. We meet you where you are.
Manufacturer-spec installs with proper commissioning, so the system actually performs the way it was designed to.
Headquartered in the LA area, dispatching across all of Southern California — Malibu, Glendale, San Bernardino, San Diego, and everywhere in between.
Same predictable process whether you're booking a service call or planning a full system replacement.
Tell us what's happening — symptoms, building type, urgency. We'll book a visit or dispatch a technician.
We diagnose the issue or assess the scope, then walk you through findings in plain language.
Clear, written scope with line-item pricing. No mystery line items. You approve before any work begins.
Work performed to manufacturer spec, system commissioned, and a written record handed off to your team.
Headquartered in greater Los Angeles, dispatching throughout SoCal. Coastal estates, commercial centers in the Inland Empire, properties down in San Diego County — we cover it.
Don't see your city? We service all of Southern California — call us and we'll let you know if it's covered (it usually is).
"ADA Mechanical handled the rooftop unit replacement on one of our retail properties. Clean install, code-compliant, on schedule. They've since taken over PM on the rest of our portfolio."
"Called on a Saturday with a dead AC. Tech was on-site within a few hours, found the bad capacitor, and we were back up before dinner. Honest pricing, professional crew."
"Replaced our 22-year-old furnace and central air. Walked us through the options with no pressure, did the install in a day and a half, and our energy bill noticeably dropped. Real pros — won't call anyone else."
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