AirProHQ
Altadena, CA · Updated Nov 2026

9 HVAC contractors in Altadena: every one with a license we could verify.

AirProHQ lists 9 heating and cooling companies in Altadena, CA, every one matched to a license on the CSLB register. 1 advertise 24-hour emergency service.

Altadena 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.

9Contractors listed
9License-verified · 100%
1Advertise 24/7 service

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

Sorted: license status, then name

HVAC contractors in Altadena, CA

Where they're based

Where Altadena'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.

Air Conditioning Solutions IncHowe Michael DH & H Mechanical IncSmalling Mechanical CoGrueter Construction CorpAction Duct Cleaning Company IncPrime Air Mechanical Inc 91001
9 of 9 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 Altadena

Altadena itself lists 9 contractors — too few to price locally on its own — but 65 operate within a real 45-mile radius, including those serving Pasadena, La Canada, Montrose. The ranges below are the same national 2026 figures used sitewide; 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
Altadena FAQ

Hiring an HVAC contractor in Altadena

Answers built from Altadena's own listing data.

01

How do I check an Altadena HVAC contractor's license?

Ask for the license number and search it on the CSLB lookup (official site). 9 of the 9 listings here already match a license on the register; each of those profiles links straight to the lookup.

02

Which Altadena HVAC companies advertise 24/7 service?

1 listing in Altadena, 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.

HVAC contractors near Altadena

All California cities
Pasadena47 contractors · 45 licensed · 3 miLa Canada4 contractors · 4 licensed · 4 miMontrose5 contractors · 5 licensed · 5 miSan Marino4 contractors · 4 licensed · 5 miSouth Pasadena3 contractors · 3 licensed · 5 miLa Crescenta21 contractors · 21 licensed · 6 miGlendale123 contractors · 123 licensed · 7 miAlhambra19 contractors · 19 licensed · 7 miSan Gabriel15 contractors · 15 licensed · 7 miTemple City17 contractors · 16 licensed · 8 mi