AirProHQ
Castro Valley, CA · Updated Nov 2026

14 HVAC contractors in Castro Valley: every one with a license we could verify.

AirProHQ lists 14 heating and cooling companies in Castro Valley, CA, every one matched to a license on the CSLB register. 1 advertise 24-hour emergency service. These listings come from the license register rather than review sites, so most carry no public rating — a verified license with no reviews is normal here, not a warning sign.

Castro Valley at a glance
License boardCSLB · number on every ad
Licenses renewing within 90 days2
Verify a license on the CSLB lookup

How we check every listing: our full verification methodology.

14Contractors listed
14License-verified · 100%
1Advertise 24/7 service

14 license-verified shown first · distances from the center of the listed offices

Sorted: license status, then name

HVAC contractors in Castro Valley, CA

Where they're based

3 ZIP codes hold 100% of Castro Valley's listed offices

Counted from the office address on each record. A contractor based near you usually means a shorter response window on a hot afternoon.

  1. 019454610
  2. 02945523
  3. 03945781
Sigma HVAC & Electric IncCheng's Mechanical ContractorCalifornia BuildersTop One Equipment CareMc Donagh John Builders And Energy SystemsBonetti Frank Plumbing IncMorrison B ASayage Refrigeration CoAffordable Heating And Air ConditioningM1 Mechanical CorpTriton HVAC & Appliance RepairVarious Energy 9454694552
13 of 14 listings have a geocoded office address. Dots are offices, not service areas.License verifiedNot verified24/7
Know the fair price

What HVAC work costs in Castro Valley

National 2026 ranges from our cost guides. Ask any contractor for a written, itemized quote and compare it against them.

JobTypical cost
Diagnostic / service call$75 – $200
Capacitor replacement$100 – $250
Refrigerant recharge$200 – $600
Compressor replacement$1,300 – $2,800
Central air conditioner$3,900 – $7,900
Full HVAC (furnace + AC)$5,000 – $12,500
Sources: AC repair cost guide · HVAC replacement cost guide
Castro Valley FAQ

Hiring an HVAC contractor in Castro Valley

Answers built from Castro Valley's own listing data.

01

How do I check a Castro Valley HVAC contractor's license?

Ask for the license number and search it on the CSLB lookup (official site). 14 of the 14 listings here already match a license on the register; each of those profiles links straight to the lookup.

02

Which Castro Valley HVAC companies advertise 24/7 service?

1 listing in Castro Valley, CA advertise round-the-clock service; filter the list above by 24/7 to see them. We record the claim from their own websites, not verified hours.

03

Why do most Castro Valley listings show no reviews?

Our Castro Valley data comes from the CSLB license register, not from review sites, so many licensed one-truck operations have no public review profile. A verified license with no reviews is not a red flag — ask for two recent local references instead.

HVAC contractors near Castro Valley

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