How we got here
Andrew is a refugee and has been in the US since 2019.
Our work includes HVAC diagnosis, repair, installation and maintenance. The equipment and the site determine the scope; we explain it in writing before work starts.
ADRIUM holds California contractor license CSLB #1136642. Our credentials are listed below, with links you can check.
Bay Area HVAC Service is the HVAC-focused arm of ADRIUM. We work with a small, consistent crew of four, two technicians and two installers, under our insurance and license. Andrew is responsible for the work.
Mitsubishi Electric Diamond Contractor since October 2026. We install Mitsubishi Electric ductless systems and continue to repair and service other mini-split brands.
Financing available on approved credit.
What our Diamond Contractor status means for your home →
Mitsubishi ductless questions: cost per room, noise, the free assessment →
What we stand for
Honest pricing, written estimates, no pressure. HVAC has earned a bad reputation: technicians quoting fifteen thousand dollars to replace a system when the real problem is a two-hundred-dollar fix. We do not work that way. A written estimate before any work begins. If the right answer is a repair instead of a replacement, the estimate says so.
The right system for the home, not the biggest invoice. Most Bay Area homes are served well by a Goodman or Daikin ducted heat pump. I completed Daikin factory training, and Goodman lists us on its official dealer locator. We know the equipment and can source the parts. For high-end work (ductless rooms, additions, and owners who want the quietest, most efficient equipment made) we install and service Mitsubishi Electric. I completed the M- and P-Series Essentials course in Sacramento in May 2026 and the Advanced M- and P-Series Service training at Mitsubishi's Los Angeles center in June 2026. We match the equipment to the house and the budget, not to our margin.
Owner-accountable, every job. For installations and complex service quotes, I meet you personally. For routine service calls, our trained technicians arrive, but every invoice carries my license number, and every estimate I review before it reaches you. One person responsible. No passing of blame.
Second opinions welcome. If another company has quoted you thousands to replace a working system, call us. We charge $99 to come show you what is actually going on, and we credit that diagnostic toward the repair. We like breaking bad templates.
Performance logs, like a doctor. We record your system's readings on every visit. Static pressures, refrigerant subcooling, capacitor microfarads, blower current. Next year, we compare. You get early warning on problems before they become summer emergencies, and you get a written maintenance history that follows the home if you sell.
I don't try to sell anyone a system. I give you options. If the right answer is a repair instead of a replacement, I'll tell you. Second opinions are welcome here. We like breaking bad templates.
What you can verify
"Family-owned" is easy to put on a website. The harder part is showing the receipts. Everything here is checkable in a public registry: the California state contractor's database, the EPA refrigerant registry, the Better Business Bureau, Wikidata. If something on this page is wrong, the registries will tell on us before we do.
Our California contractor's license is CSLB #1136642, in good standing since 2021. EPA Section 608 universal certification on file, #1279674151528. HC(A3) & HFO(A2L) Certified Technician (Mainstream Engineering, cert #H43E9118EC832MMM0), trained on the new low-GWP A2L refrigerants now shipping in heat pumps and AC systems. Better Business Bureau accreditation, A+. Daikin factory training, Houston 2025. Mitsubishi Electric factory training: M- and P-Series Essentials (May 2026) and Advanced M- and P-Series Service at the Los Angeles training center (June 2026).
The team, and the work
The team is small on purpose. Four people: two service technicians, two installers, plus Zlata Velikaia, co-owner, on scheduling and invoicing, and me on estimates. All four field people are consistent (not rotating strangers) working under ADRIUM's license, insurance, and training standards. When the work scales beyond what we can do well, we decline the job rather than dilute the standard.
Zlata Velikaia is co-owner. She handles scheduling, bookkeeping, document flow and finances. Andrew and Zlata each own half of the company.
Tech Aid for Refugees
Through Tech Aid for Refugees, donated household appliances are collected, repaired and delivered to people who need them. Learn how to donate or volunteer on our community page.
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Work with someone whose license is on every invoice.
Bay Area · 7am–7pm · 7 days · no overtime charges