Commercial HVAC in San Mateo and Santa Clara counties
Commercial HVAC down? Start here.
Repair, replacement, maintenance, rooftop units, VRF and VRV all sit under one roof here. Pick the page that fits what your building is doing; each says what the work involves.
Pick your job
What's going on in your building?
- Commercial HVAC repairA unit has stopped, or isn't keeping up.
- Rooftop unit repair and replacementThe package unit on your roof.
- VRF and VRV systemsDiagnostics, repair and upkeep for multi-zone systems.
- Commercial installation and replacementPlanning a new unit before the old one fails.
- Commercial HVAC maintenanceScheduled visits that catch faults early.
What commercial HVAC work do you do?
Repair, replacement, maintenance, rooftop units and VRF or VRV systems, all from one company. A facilities manager or a business owner can call one number whether a unit has died, a replacement is being planned or the building needs a maintenance schedule.
Each page below says plainly what the work involves and what to have ready, so you know what to expect before you call.
Do you work in San Carlos, Redwood City and Palo Alto?
Yes. We take commercial work in San Carlos, Redwood City and Palo Alto, and across San Mateo and Santa Clara counties. Our office is in San Mateo.
What was the rooftop unit job in July 2026?
A rooftop package unit service call. The photo at the top of this page and the others from the job show a technician at the open unit, reading its wiring with a clamp meter.
We say only what the photos show.
What should I have ready when I call?
The unit's nameplate if you can read it, with the maker, the model and the serial number. Then what the unit is doing, when it started and whether a breaker has tripped.
Also tell us how we get to the equipment, whether that is a roof hatch, a ladder or a locked door, and who can let us in and approve the work.
Tell us what your building needs
Call and describe it, or book a visit online.
Do the state's refrigerant rules affect a commercial replacement?
Yes. California requires new AC and VRF equipment, for homes and businesses alike, to use a refrigerant with a global warming potential (GWP) less than 750, and for new VRF systems the date is January 2026.
Source: California Air Resources Board, air-conditioning equipment rules, checked 2026-10-17.
Who will do the work?
AD Mechanical Services Inc., a San Mateo company owned by Adlan Cherkesbiev, under CSLB license #1155755, C-20 Warm-Air Heating, Ventilating and Air-Conditioning.
Tell us what it's doing. We'll take it from there.
Call and describe the problem: the noise, the smell, the room that never warms up. Or book a visit online.
