Contra Costa County • Licensed C-20 HVAC Contractor

HVAC Installation & Replacement in Walnut Creek, CA

From larger Northgate and Rossmoor homes that need properly zoned systems to downtown remodels adding ductless comfort, Walnut Creek's hot, dry summers make a correctly sized AC system the difference between July comfort and a runaway PG&E bill.

📞 Call (925) 826-5180 Get Free Estimate →

CSLB #995372 Since 2014 Owner Walks Every Estimate Insured & Bonded

Local Contra Costa County Contractor

Licensed C-20. Owner-assessed. Every time.

Infinium Air has served Walnut Creek from our Concord shop since 2014. We know Contra Costa County's building departments, Title 24 requirements, and inspection process firsthand — and Dragan, the owner, walks every estimate personally. No commissioned salesmen, no guesswork sizing.

Replacement & installation work we do in Walnut Creek

AC installation & replacement — load-calculated sizing, SEER2-rated equipment, permit + HERS included
Heating & furnace replacement — 95%+ AFUE gas furnaces and electric heat pump conversions
Ductless mini-split systems — single and multi-zone; ideal for homes without existing ducts
Ductwork design & replacement — Title 24 compliant; HERS duct-leakage testing handled
Commercial HVAC — rooftop package units, VRF/VRV arrays, crane lifts, TI scopes
Repair & diagnostics — honest repair-vs-replace math, on any brand

ZIP codes served: 94595–94598 | Neighborhoods: Saranap, Rossmoor, Northgate, Parkmead, Lakewood

Call (925) 826-5180 Free Estimate in Walnut Creek

High-efficiency HVAC condenser installation by Infinium Air serving Walnut Creek, CA

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(925) 826-5180

Leave a message if we're on a job — same-day callback.

What system replacement costs in Walnut Creek

Real 2026 ranges for quality equipment professionally installed with permits — not lowball bids that change at install.

AC Replacement

$8k – $15k Condenser + coil, load-calculated sizing, permit & HERS included

Full System (AC + Furnace)

$14k – $25k Replacing both together costs less than two separate projects

Heat Pump Conversion

$16k – $30k Before incentives. Heats and cools from one system — no combustion

Mini-splits: $5k–$8.5k single zone / $14k–$25k multi-zone • Commercial: quoted per project

Call for a Free Estimate — (925) 826-5180

Why Walnut Creek property owners choose Infinium Air

Owner On Every Estimate

Dragan walks every Walnut Creek job personally — load calculation, duct inspection, honest quote. You talk to the person responsible, not a commissioned closer working a script.

Licensed & Verifiable

California C-20 HVAC license #995372, insured and bonded, workers' comp on file. Look us up at cslb.ca.gov before we ever set foot in your home.

Permits & HERS — Always

We pull the permit and coordinate HERS testing on every job that requires it. No "skip the permit" shortcuts that void warranties and create disclosure problems when you sell.

Common HVAC projects in Walnut Creek

AC replacement for aging systems in Walnut Creek

Most AC condensers last 15–20 years. If yours limps through heat waves, runs constantly, or needs refrigerant every spring, replacement usually beats repair — and modern SEER2-rated equipment cuts cooling costs significantly. We use a real load calculation, not a tonnage guess — and we quote honestly: if a repair makes more sense, we say so before you spend replacement money.

Furnace replacement & heat pump conversions in Walnut Creek

Furnaces older than 20 years run 60–80% efficiency; modern condensing equipment runs 95%+. Many Walnut Creek homeowners now convert to electric heat pumps that heat AND cool from a single system — we'll show you both options with real operating-cost numbers at the estimate so you can choose with your eyes open.

Ductless mini-splits for homes without ducts

For Walnut Creek homes without existing ductwork — or for additions, garages, ADUs, and bonus rooms — ductless mini-splits deliver heating and cooling room by room without major construction. Single-zone installs start around $5,000–$8,500; multi-zone systems (3–4 rooms) run $14,000–$25,000.

Permits & Title 24 HERS testing in Contra Costa County

HVAC changeouts in Contra Costa County require a building permit — yes, even like-for-like condenser swaps. Most duct-connected replacements also require HERS verification testing under Title 24. Infinium Air pulls every permit and coordinates the HERS rater. Any contractor who offers to "save you the permit cost" is passing the legal and warranty risk on to you.

Duct inspection, sealing & replacement

Leaky ducts waste 20–30% of the air you pay to heat and cool. We test duct leakage on every replacement job, seal what's salvageable, and replace what isn't — with proper sizing for the new equipment's airflow requirements.