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Top-Rated Air conditioning pros in Altadena - Updated Nov 2026

Avatar for MULTI AIR SERVICE LLC
MULTI AIR SERVICE LLC
5.0(
22
)
Central A/C - Service or RepairWindow A/C Unit - Service or Relocate

Serving Altadena, CA and surrounding areas

Approved

In business since 2016

Free estimates

Emergency services offered

"I purchased a mini-split AC system online and Ricardo installed it. Usually, a unit is purchased through the installer, but he was willing to work with me and just charged me on the labor for install and testing. He did great work and was priced fairly. The unit is up and running well and I couldn’t be happier. I highly recommend hiring him and I will do so again if I have future needs!"
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+37

Recommended by77%of homeowners
Avatar for AC Dave Heating & Air
AC Dave Heating & Air
4.9(
93
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+3 more

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"I called and they sent someone out the next day. They were prompt and efficient and most of all the swamp cooler was repaired. The price they charged was excellent. I also signed up for a maintenance contract based on how well they took care of this problem. There are not a lot of places left who service swamp coolers so this was a good find. I have already recommended them to my sister for service on the air conditioning system in her home."
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+6

Response time7 hrs
Response rate100%
3 neighbors recently requested a quote
Efficiency Air, Inc.
4.8(
321
)
Central A/C - Install

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1985

Free estimates

Credit card accepted

"Wife: With all the heat wave stuff, this summer really hasnâ t been that bad for us so far. Me: Hm, maybe thatâ s because of our new air conditioning installed by Efficiency Air! After talking to many HVAC estimators, I started to feel like the amount bid went up the more they talked (something something hot air). Dean with Efficiency Air is a professional installer who was not like that. Dean listened to my needs, giving me two options. And while I was not initially in the market for a heat pump, the cost convinced me. After a few months, we could not be happier with the choice. Money well spent."
A/C Condensers
A/C Condensers
A/C Condensers
A/C Condensers
Canoga Park, Goodman A/C

+50

Response time7 hrs
54 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Air Duct Professionals
Air Duct Professionals
4.7(
1,518
)
Air Ducts & Vents - Clean

Serving Altadena, CA and surrounding areas

Approved

In business since 1990

Free estimates

Warranties offered

"Sean was great about repairing my disconnected dryer air duct having to go into the crawl space and figure out what was going on. I'm glad he was able to get it done very quickly as well. He also had a very good attitude about doing the work."
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+11

Response time1 day
2 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for Temp Air System, Inc.
Temp Air System, Inc.
4.8(
59
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceAir Ducts & Vents - Clean+1 more

Serving Altadena, CA and surrounding areas

Approved

In business since 2002

Free estimates

Credit card accepted

"We had Temp Air install our AC unit. The best decision we ever made. They were fast, reliable and dependable. Excellent customer service, did a phenomenal job. After a couple of years something was going on with our unit, I called them and immediately they send out a technician Juan, who was phenomenal. He explained what the issue was and resolved it asap! Highly recommend this company!"
Mini Split Installation
Mini Split Installation
Mini Split Installation
Mini Split Installation
Mini Split Installation

+14

Response time10 hrs
Response rate99%
10 neighbors recently requested a quote
Avatar for Trinity Heating and AC
Trinity Heating and AC
5.0(
46
)
Central A/C - Service or Repair

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"Just a "simple" ecobee install. Tech had a minor issue with my AC unit (it's 100%my unit) and didn't even attempt to upcharge us. Very honest and knowledgeable company. Will absolutely recommend to everyone I know."
Furnace Before
AC After
Furnace After
AC Before
Before - Furnace

+83

Response time3 hrs
Response rate98%
28 neighbors recently requested a quote
Avatar for Help-Me HVAC LLC
Help-Me HVAC LLC
5.0(
27
)
Central A/C - Service or Repair

Serving Altadena, CA and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"Sayed Haroon was very happy professional and helpful and very informative, I would recommend him for any service and next time if there?s a problem with any of my air conditioning system I?m definitely gonna be dealing with him"
My jobs
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1 neighbors recently requested a quote
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Air Conditioning FAQs, answered by experts

If your AC runs constantly, it could be due to a number of things, including a faulty thermostat, incorrect temperature settings, or broken equipment. Alternatively, you might have an airflow problem (for example, blocked vents or leaky ductwork). Either way, an HVAC pro can identify the specific problem and fix it for you.

There are many signs of a bad AC fan motor, including if the fan blades don’t spin when the AC kicks on or if they keep spinning when the AC is off. The AC fan cools down the condenser coil, so a faulty motor can also cause the system to overheat. Unusual noises in the exterior AC unit, including grinding or rattling sounds, may also be a sign that the AC fan motor is worn out.

You can air condition your Arizona room by extending your home’s existing HVAC system or adding a ductless mini-split system. Arizona rooms that have full windows rather than screens only are a better choice for air conditioning—screens will let the cold air out as fast as the air conditioner can make it. 

Signs that your A/C system needs professional service include increased energy bills, uneven or poor cooling, loud or unusual noises, and frequent cycling.

It depends on the size of the space you’re cooling down. If you’re looking for the most affordable way to cool an entire house over a long period of time, then central air will be more cost-effective. But when it comes to cooling down a couple of rooms or one floor, a window unit may be the cheaper option, with both a lower cost to install and less energy used to run.

The Altadena, CA homeowners’ guide to air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.