AC Installation & Replacement
High-efficiency air conditioning sized by load calculation — not driveway guesswork. Like-for-like swaps and full system upgrades, permitted and HERS-tested.
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Licensed C-20 HVAC · Concord, CA · Since 2014
East Bay HVAC replacement — sized right, permitted properly.
Full system installs, heat pumps, and commercial rooftop work across Contra Costa & Alameda County. The owner walks your job, runs the load calculation, and quotes it itemized — no commissioned sales crew.
C-20 Lic. #995372
Since 2014 in the East Bay
Insured & Bonded
Residential + Commercial
Free Estimate
Tell us about your project.
We respond within one business day. No commissioned salesmen, no pressure — the owner walks your project and quotes it straight.
- Free on-site assessment & real load calculation
- Itemized written quote — equipment, labor, permits
- C-20 licensed, insured & bonded — verify at cslb.ca.gov
- Permits & HERS testing handled on every job
- If a repair is the smarter call, that's what we'll tell you
Prefer to talk? Call (925) 826-5180
What We Do
Heating, cooling & air — done right
From a single mini-split to a crane-set commercial rooftop system, every job gets the same discipline: real load math, clean installation, proper permits.
Heating & Furnaces
Gas furnace replacement (up to 96%+ AFUE) and electric heat-pump conversions. Honest guidance on which one actually fits your home and budget.
Learn more →Ductless Mini-Splits
Room-by-room heating and cooling with no ductwork required. Perfect for older homes, additions, ADUs, garages, and anywhere ducts can't reach.
Learn more →Ductwork & Ventilation
Duct repair, sealing, and full replacement. Leaky ducts waste 20–30% of the air you pay for — we test, fix, and verify with HERS where required.
Learn more →Commercial HVAC
Rooftop package units, VRF systems, make-up air, tenant improvements — including crane-set installations. Engineering discipline, on schedule.
Learn more →Repair & Maintenance
Diagnostics and repair on all major brands — including systems we didn't install. If a $400 fix beats a $14,000 replacement, that's what we'll tell you.
Learn more →
Recent Projects — Real Photos, No Stock
The work speaks for itself
Customer Reviews
East Bay homeowners & property managers trust Infinium
Real work, honest quotes, permits pulled every time. Verify our license at cslb.ca.gov — #995372.
★★★★★
"Full AC and furnace replacement in Walnut Creek. Dragan walked the house himself, ran the load calc, and quoted it exactly — no sales pressure. Permitted, HERS passed first try, crew left the attic cleaner than they found it. Quote matched the invoice to the dollar."— Kevin M., Walnut Creek System replacement · 2025
★★★★★
"We manage a retail strip in Concord and had a rooftop unit fail in July. Infinium had a crane on site within the week. Inspector signed off the same day they finished. That's the only contractor we call now for commercial work."— Sandra R., East Bay Property Manager Commercial rooftop HVAC · 2025
★★★★★
"Dragan was upfront that our 9-year-old system only needed a $480 repair — not a new unit. He could have sold us a $15,000 replacement and we'd never have known the difference. That honesty is why we'll use Infinium when it is time to replace."— Tom & Lisa F., Danville Honest assessment · 2024
★★★★★
"Three-zone mini-split install in our older Lafayette home — no existing ductwork, tight attic. Infinium figured out the routing, got the permit, and finished in two days. We've had it two summers now, no issues."— Priya D., Lafayette Ductless mini-split · 2024
★★★★★
"Heat pump conversion on a 1970s Pleasant Hill home. Dragan walked us through the electrical upgrade requirement upfront — no surprises on the invoice. Two weeks start to permit-close. Utility bill down noticeably the first month."— Marcus & Tanya W., Pleasant Hill Heat pump conversion · 2025
★★★★★
"VRF system across a 6,000 sq-ft Fremont office TI. On schedule, permit-to-inspection in three weeks. GC was impressed with how clean the mechanical room came out. Would hire again without hesitation."— Robert C., Fremont (General Contractor) Commercial VRF installation · 2025
Rated 4.9 out of 5 across 94 verified reviews. Verify CSLB #995372 at cslb.ca.gov.
Where We Work
Serving the entire East Bay
Free estimates across every city in Contra Costa and Alameda County, dispatched from our Concord shop. Click any pin to view local details.
20 cities served across the East Bay — free estimates anywhere on the map.
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Contra Costa County
Owner-Operator
Ask for Dragan — the owner walks your job before you get a quote.
No call center. No commissioned salesman sent to push the biggest system. When you call Infinium Air, Dragan personally assesses the home or building, measures the real load, checks the ducts, and quotes what the job actually needs.
We book system replacements and commercial installs across the East Bay. If your equipment only needs a repair, Dragan will say so before you spend replacement money.
Call Dragan — (925) 826-5180
Commercial HVAC
Crane-set rooftop units. VRF systems. Tenant improvements. Done right.
Property managers and general contractors hire Infinium Air because commercial jobs demand the same precision as residential — real load math, licensed crews, permit-to-inspection execution on every rooftop unit, make-up air system, or multi-zone VRF array.
- Rooftop package units — single and multi-zone
- VRF / variable refrigerant flow systems
- Make-up air, exhaust, and ventilation
- Tenant improvements & TI coordination
- Crane-set installs with licensed rigging
Why Infinium Air
No call centers. No sales quotas. No games.
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"Ask for Dragan." The owner walks every estimate personally — measures the real load, checks the ducts, and quotes what your building actually needs. Not the biggest box on the truck.Owner-Led Estimates Every job, every time
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C-20 licensed since 2014, insured, bonded, workers' comp on file. Don't take our word for it — punch #995372 into cslb.ca.gov and verify us in sixty seconds, before we ever set foot in your home.Licensed & Verifiable CSLB #995372 · Concord, CA
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The same company that engineers crane-set commercial rooftop systems and VRF arrays installs your home's AC. That discipline — load math, clean refrigerant practice, first-pass inspections — comes standard.Commercial-Grade Standards On every residential job
Frequently Asked
Questions, answered straight.
How much does AC replacement cost in the East Bay?
A like-for-like AC condenser and coil replacement typically runs $8,000–$15,000 installed with permits, depending on tonnage and efficiency tier. A full system (furnace + AC together) typically runs $14,000–$25,000 — and replacing both at once costs meaningfully less than two separate projects. Heat pump conversions range $16,000–$30,000 before any incentives. Every Infinium Air quote is itemized — equipment, labor, permits, disposal — so you see exactly what you're paying for.
Should I repair or replace my system?
The rule of thumb we actually use: repair cost × system age in years. Over $5,000–$6,000, replacement usually wins. A $500 repair on an 8-year-old system? Fix it. A $1,200 repair on a 17-year-old system? Put the money toward new equipment. We repair systems we didn't install, and if the repair is the smarter call, that's what we'll tell you.
Do I need a permit to replace my AC or furnace in California?
Yes. HVAC changeouts in Contra Costa and Alameda County require building permits — even like-for-like swaps — and most duct-connected replacements also require independent HERS verification testing under California's Title 24 energy code. A contractor offering to "save you the permit money" is creating warranty, insurance, and home-sale problems on your dime. We pull permits and coordinate HERS on every job where they're required. No exceptions.
Are you licensed and insured?
Yes. Infinium Air, Inc. holds California CSLB license #995372 with a C-20 classification (Warm-Air Heating, Ventilating and Air-Conditioning), carries general liability insurance, a contractor's bond, and workers' compensation. Verify it yourself at cslb.ca.gov — takes sixty seconds, and we think every homeowner should check every contractor that way.
Heat pump or new furnace — which should I get?
Honest answer: it depends. Heat pumps heat and cool from one system, burn nothing, and fit our mild climate beautifully — but cost more upfront and may need electrical work. Gas furnace + AC costs less today and gas is currently cheap to run. If you're renovating or going solar, price the heat pump seriously; if budget rules and your ducts are good, a high-efficiency furnace is still a great system. We quote both options with real numbers and zero ideology. Incentive programs come and go in funding waves — we check what's live when we quote.
How long does an installation take?
Most residential system replacements take one to two days. Mini-split installs: usually one day for a single zone, two to three for multi-zone. Projects requiring duct replacement or electrical upgrades run longer — we give you an exact timeline with the estimate, and we show up when we say we will.
Do you do commercial work?
Yes — it's a core part of the business. Rooftop package units, VRF systems, make-up air, tenant improvements, crane-set installations. See the Projects page for recent commercial work. Property managers and GCs: we quote from plans or site walks.
Do you serve my city?
If you're in Contra Costa or Alameda County, yes — Concord, Walnut Creek, Danville, San Ramon, Pleasant Hill, Lafayette, Martinez, Pittsburg, Antioch, Brentwood, Oakland, Berkeley, Fremont, Pleasanton, Livermore, Dublin, Hayward, San Leandro, Alameda, Union City, and every community in between. Free estimates anywhere in our service area.