Design-Build · HVAC · Electrical · Refrigeration · Fabrication
Commercial HVAC & refrigeration in Southern California
Family-owned. We design, build, and service systems for restaurants, theaters, schools, grow facilities, and everything in between across Southern California.
New construction & design-build
We don't just fix it — we build it
System design
Load calculations, equipment selection, and mechanical drawings — engineered for your building, not pulled from a catalog.
New construction
Ground-up mechanical installs coordinated with GCs and architects from design through commissioning.
Retrofit & replacement
Upgrade aging systems on your schedule. Phased installs, temporary cooling, zero disruption to your operations.
Why Onshore
Three licenses, one contractor
C-20 — HVAC
Design, new construction, retrofit, and ongoing service — all system types and tonnages.
C-10 — Electrical
We wire our own disconnects, controls, and panels. No waiting on a separate electrical sub.
C-38 — Refrigeration
Walk-in coolers, freezers, display cases, and process cooling — installed and serviced in-house.
Trusted by
Private sector and public sector
What we do
Design, build, and service
HVAC System Design & Installation
Commercial and residential HVAC installation in Southern California. New construction and retrofit systems sized to actual load requirements.
→ 02Commercial Refrigeration
Commercial refrigeration service and installation in Southern California — walk-in coolers, freezers, display cases, and process cooling.
→ 03Preventive Maintenance
HVAC preventive maintenance programs in Southern California. Scheduled service that reduces emergency calls and extends equipment life.
→ 04Emergency Repair
24/7 emergency HVAC and refrigeration repair in Southern California. Fast dispatch for compressor failures, electrical faults, and system breakdowns.
→ 05Equipment Retrofit & Upgrades
HVAC equipment retrofit and upgrades in Southern California. Replace aging systems with efficient equipment — zero downtime, phased installs.
→ 06Indoor Air Quality
Indoor air quality services in Southern California. Ventilation design, HEPA filtration, UV-C systems, and ASHRAE 62.1 compliance.
→ 07Commercial Electrical
C-10 licensed electrical contractor in Southern California. HVAC electrical, panel upgrades, disconnects, controls wiring, and 3-phase power.
→ 08Custom Sheet Metal & Ductwork
Custom sheet metal and ductwork fabrication in Huntington Beach, CA. Plenums, transitions, kitchen exhaust hoods, and specialty fittings built to spec.
→Brands we service
Factory-trained on the equipment you run
Industries we serve
From movie theaters to grow rooms
Restaurants & Food Service
Restaurant HVAC, refrigeration, and kitchen exhaust in Southern California. Walk-in coolers, hoods, and makeup air for food service facilities.
→Retail & Grocery
Commercial refrigeration and HVAC for retail stores and grocery chains in Southern California. Multi-location service programs available.
→Office & Commercial Buildings
Commercial HVAC for office buildings and properties in Southern California. Tenant comfort, energy efficiency, and code compliance.
→Hospitality & Entertainment
HVAC and refrigeration for hotels, theaters, casinos, and entertainment venues in Southern California. Climate control for guest-facing spaces.
→Healthcare & Labs
Healthcare and laboratory HVAC in Southern California. Critical environment climate control with strict temperature, humidity, and air quality requirements.
→Industrial & Warehouse
Industrial HVAC, process cooling, and ventilation for warehouses and manufacturing facilities in Southern California.
→Indoor Grow Facilities
Grow room HVAC, dehumidification, and climate control for indoor cannabis cultivation and agriculture in Southern California.
→Wine Rooms & Specialty Storage
Wine cellar and specialty storage cooling in Southern California. Precision temperature and humidity control for wine rooms, cigar rooms, and sensitive inventory.
→Gyms & Fitness Studios
Gym and fitness studio HVAC in Southern California. High-capacity systems for martial arts, fencing, and athletic facilities.
→Public Sector & Schools
HVAC contractor for school districts, municipal buildings, and government facilities in Southern California. Prevailing wage compliant.
→Our work
See it for yourself
5.0 stars · 24 reviews
What our clients say
"Sets the standard for reliable HVAC service. Owner is incredibly trustworthy and upfront with fair pricing, no surprises. Communication was excellent throughout. Exceptional attention to detail exceeded expectations."
"As a general contractor, I use Brock's team on all projects. Great service and fair prices. I don't use any other HVAC company — Brock has me covered."
"Our HVAC units from 1980–2000 were labeled unfixable by others. Onshore evaluated thoroughly and provided honest proposals. Surprisingly, they restored every unit to working condition."
Service area
All of Southern California
LA County, Orange County, Inland Empire, and surrounding areas.
How we work
Straightforward from start to finish
You call, we show up
We walk your facility and figure out what you actually need.
Clear quote
Fixed price, scope spelled out. No surprise change orders.
We do the work
Scheduled around your operations so nothing shuts down.
Ongoing support
PM programs, emergency priority, a crew that knows your equipment.
Let's talk about your building.
New construction, retrofit, service contract, or something's broken right now — we're here.
Get in touch