AirProHQ
Diamond Bar, CA · Updated Nov 2026

35 HVAC contractors in Diamond Bar: every one with a license we could verify.

AirProHQ lists 35 heating and cooling companies in Diamond Bar, CA, every one matched to a license on the CSLB register. 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.

Diamond Bar at a glance
License boardCSLB · number on every ad
Licenses renewing within 90 days1
Verify a license on the CSLB lookup

How we check every listing: our full verification methodology.

35Contractors listed
35License-verified · 100%

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

Sorted: license status, then name

HVAC contractors in Diamond Bar, CA

License verified

Airpropower

91765 · under ½ mileLicense 1150732 · to 2028
Public reviewsNone on file
CallProfile
License verified

Aveo Inc

91765 · under ½ mileLicense 969881 · to 2028
Public reviewsNone on file
CallProfile
License verified

Mr A/C

91765 · 1.3 miLicense 864636 · to 2027
Public reviewsNone on file
CallProfile
License verified

Qin HVAC

91765 · under ½ mileLicense 1161560 · to 2028
Public reviewsNone on file
CallProfile
Where they're based

Where Diamond Bar's contractors are based

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

Mac Refrigeration And Air Conditioning COMedrara HVACYq Air Condition SolutionGary's Ac ServicesAce Rodil Heating And Air ConditioningYuze Air ConditioningCal Steam CompanyGreen Air & RefrigerationAllwayz Heating & Air Conditioning IncCiel Air Conditioning And ElectricAveo IncDaley Kenneth Heating & Air ServicesManaga Raul ManuelHonest Pro Air Conditioning And HeatingMr A/CWu Chung ChiehH J R Contracting IncService WizardsClimate SpecialistsZip Renovation & AirThlc CorporationHigh Noon AirAtlantic Air Conditioning IncMcmaster MechanicalZhuoxin ConstructionLanyi Usa IncDk Air & RefrigerationZy HVAC Equipment ServicesAc Heat Diamond BarAirpropowerPlhk HVAC IncQin HVACJh Advanced HVAC Solutions 91765
33 of 35 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 Diamond Bar

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
Diamond Bar FAQ

Hiring an HVAC contractor in Diamond Bar

Answers built from Diamond Bar's own listing data.

01

How do I check a Diamond Bar HVAC contractor's license?

Ask for the license number and search it on the CSLB lookup (official site). 35 of the 35 listings here already match a license on the register; each of those profiles links straight to the lookup.

02

Why do most Diamond Bar listings show no reviews?

Our Diamond Bar 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.

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