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Avatar for Global Green Solutions
Global Green Solutions
5.0(
248
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceCentral A/C - Install - For Business+2 more

Serving San Dimas, CA and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Very happy with the new installation, replacement, and repair services for heating and air conditioning! The technicians were courteous, well-informed, and on time. They promptly resolved the problem and provided comprehensive explanations. A truly professional and trustworthy crew. Strongly suggested!"
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+24

Response time3 days
7 neighbors recently requested a quote
Recommended by7%of homeowners
Avatar for MSP Heating and Air, LLC
MSP Heating and Air, LLC
4.9(
328
)
Central A/C - Service or RepairAir Ducts & Vents - Clean

Serving San Dimas, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2016

Free estimates

Emergency services offered

"We contacted MSP for air conditioning services. Their coustomer ratings on Yelp were great. MSP was able to come out right away. The team from Angel Perez, technician, to the installers, Don and Don and those that work in the office were nothing less than helpful, kind, professional, informative and courteous. The installation process was flawless and took just a few hours. The guys were very friendly but more importantly, they made us feel confident in what they were doing. We worked out the finances which was a very simple and easy process and by the end of the day we had nice cool air flowing on a day that had temperatures in the high 90s. We are very thankful and grateful to MSP Heating and Air Conditioning. I feel certain you would be too."
duct job all R-8 ducting
4 Ton GOODMAN Furnace
customer Vlastos
duct job all R-8 ducting
furnace install

+67

Response time4 hrs
32 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Air Duct Professionals
Air Duct Professionals
4.7(
1,518
)
Air Ducts & Vents - Clean

Serving San Dimas, 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 - InstallCentral A/C - Service or RepairAir Ducts & Vents - Clean+1 more

Serving San Dimas, CA and surrounding areas

Approved

In business since 2002

Free estimates

Credit card accepted

"Temp Air personnel are responsible, honest, knowledgable, and their customer service is top of the line. They were accommodating with a scheduled that worked for us. Also, the techs that came to our house were professionals and answered all of our questions. I highly recommend them."
Mini Split Installation
Mini Split Installation
Mini Split Installation
Mini Split Installation
Mini Split Installation

+14

Response time10 hrs
Response rate99%
9 neighbors recently requested a quote
Avatar for Trabuco Air
Trabuco Air
4.6(
130
)
Central A/C - Service or Repair

Serving San Dimas, CA and surrounding areas

Approved

In business since 1996

Free estimates

Emergency services offered

"Very professional; very responsive. Answered on first call, Scheduled appointment for next day. Resolved problem with AC without trying to upsell or charge a lot. I’ve already booked another appointment with Trabuco Air for another home. Highly recommend!"
Response time5 hrs
3 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for McLay Services
McLay Services
4.8(
281
)
Central A/C - InstallCentral A/C - Service or RepairAir Ducts & Vents - Clean+2 more

Serving San Dimas, CA and surrounding areas

Approved

In business since 1978

Free estimates

Emergency services offered

"I had a great experience with your team. They serviced and repaired my mini-split and central They serviced my A/C systems, added refrigerant, and made sure everything was working properly before leaving. Mike was thorough, professional, knowledgeable, and did quality work. I highly recommend this company."
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+3

83 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for RS Air Conditioning & Heating
RS Air Conditioning & Heating
4.9(
23
)
Central A/C - Service or Repair

Serving San Dimas, CA and surrounding areas

Approved

In business since 1990

Free estimates

Emergency services offered

"Ray is very professional, and provided options for my air conditioning unit replacement. Ray went out of his way to replace a small gas line leak that he found. He also drove to Anaheim early on Saturday morning to pick up a part that was needed for the AC unit, and came over to install it so that I would have the air conditioner available for the upcoming heat wave this week. He and his team were on time, and considerate during the installation process. I highly recommend RS Air Conditioning & Heating."
New Outdoor Install
Furnace Install
Satisfied Client
Energy saver!
Carrier Water Soure

+2

Response time3 hrs
Response rate100%
Recommended by100%of homeowners
Avatar for Penguin Heating and Air Inc
Penguin Heating and Air Inc
5.0(
15
)
Central A/C - InstallCentral A/C - Service or RepairCentral A/C - Install - For Business+1 more

Serving San Dimas, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Emergency services offered

"Very knowledgeable, professional, and great customer service! Penguin, serviced our central AC & Heat and they explained everything to us before performing the work. They also replaced our moldy insulation in our attic. They packed and transported the old moldy insulations, ensuring that the mold does not spread, and they left our house free of any mess. I'd recommend Penguin Heating and Air to anybody in need of AC/Heat service, repair, or installation."
Diamond Bar
Diamond Bar
Diamond Bar
Furnace Install
AC Condenser

+6

Response time2 hrs
Response rate100%
15 neighbors recently requested a quote
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Air Conditioning questions, answered by experts

If refrigerant levels are low, it can cause the evaporator coil to freeze up. Low freon causes a drop in pressure, which will make the coil too cold and cause moisture to freeze on the coil. Your system may be low on refrigerant because of a leak. 

Make sure to have maintenance performed twice a year, and contact your local HVAC technician if you suspect your system has low freon levels.

A power outage can damage your air conditioner, just like a power surge can damage any electrical device or appliance. In most cases, your circuit breaker or built-in surge protection on your AC unit protects your AC and just needs a reset. But in other cases, it might be that your AC compressor or capacitor was blown during the power surge. You’ll need to have an HVAC professional repair or replace any AC parts. 

Professional HVAC installation requires licensed expertise in several areas, including electrical- and plumbing-related work. An HVAC team must know how to safely handle regulated refrigerant chemicals and the gas, oil, or propane used in furnaces and boilers. A proper HVAC installation protects your home from energy loss, fires, and even carbon monoxide leaks.

You should get anywhere from three to five quotes for HVAC replacement to get an idea of the average cost of a new unit. Although this quote-collecting process can be time consuming, it allows you to compare what work is required, what type of unit you should install, and how much you should expect to pay for the service.

You may be able to clean mold from your air conditioner in some cases. If the mold growth only takes up a small area, you can use either vinegar or bleach mixed with water to remove it. Larger areas of mold should be left to the professionals, though. It's also a good idea to leave mold removal to the pros if you are sensitive to mold or have asthma. 

The San Dimas, CA homeowners’ guide to air conditioning services

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