Top-rated air conditioning pros.

Best air conditioning pros near Castro Valley, CA

Enter your zip and get matched with up to 5 pros

Need a pro for your air conditioning project in Castro Valley, CA?

Select your specific project to find the pro for you.

Top-Rated Air conditioning pros in Castro Valley - Updated Nov 2026

Avatar for DUKES HEATING & AIR CONDITIONING
DUKES HEATING & AIR CONDITIONING
4.8(
135
)
Central A/C - InstallCentral A/C - Install - For BusinessDuctless Mini-split A/C - Install or Replace+3 more

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"The tenant called him a couple of months ago for something he had one previously, but because he's a good guy, and we had done something six months ago that was very expensive, whatever went wrong this time he just must've fixed. The tenant said she was going to call us back to let us know he fixed it, and there was no contact again, so I'm assuming everything was fine. Our tenant just knows to call him if it's anything to do with heating and air conditioning. He usually does a perfect job and works with you if something goes awry to make sure it's right. I would use him again. He is right there."
Heat Pump Repairs & Installations
Central Air Cut-Ins
Electric Furnace Repairs & Installations
Response time1 day
Response rate100%
27 neighbors recently requested a quote
Avatar for Global Comfort Heating and Air
Global Comfort Heating and Air
4.8(
52
)
Central A/C - Service or Repair

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2009

Free estimates

Emergency services offered

"To start, I put in for an emergency call to Freschi and was told they would call me 30 minutes before. They never called me back. Freschi sucks!!!I I also put in a request on HomeAdvisor on Thursday night and was given Global Warming Heating and Air as one of their verified contractors. I got a call at 7am from Rudy. I called back around 830am and we made an appointment for 1130am. He showed up at 1105am and quickly diagnosed the problem. He recommended replacing the furnace(which houses the blower assembly) due to the cost of repairs and its 17 year old condition. He didn t try to up sell me for an entire new system. He said my AC is working well so there s no need to replace it. I decided to replace the furnace and he said he d be back around 130pm. Rudy and his crew were back by 1pm. From the start of demo to it running again was less than 2 hours. Rudy s customer service is top notch!! From now on, I will only be calling Global Warming Heating and Air. I can t say enough good things about Rudy s business ethics and timeliness. A+++++"
Team Global Comfort Truck
Carrier Heater Changeout
Duct Install securing runs
Duct Install securing runs
Carrier 95% Installation

+9

Response time50 mins
Response rate94%
2 neighbors recently requested a quote
Avatar for Rittinger Heating and Air
Rittinger Heating and Air
5.0(
18
)
Central A/C - Service or RepairDuctless Mini-split A/C - Install or Replace

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

*****669-669-2435*****We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business.

Service maintenance
Service maintenance
Service maintenance
Service maintenance
Service maintenance

+6

13 neighbors recently requested a quote
Avatar for Albert Nahman Plumbing, Heating, and Cooling
Albert Nahman Plumbing, Heating, and Cooling
4.4(
722
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceCentral A/C - Install - For Business+3 more

Serving Castro Valley, CA and surrounding areas

Approved (Corporate)

In business since 1981

Free estimates

Warranties offered

"Albert Nahman PHC installed new AC and Furnace for my house. I like them for several reasons -- 1. At first Tom explained in detail what equipment I need and how they work, and gave me a reasonable and detailed quote at end of the visit. 2. They offer interest free finance. 3. I got free upgrade for furnace when the original quoted is not available. 4. Their installer did good job, and cleaned up afterward. I highly recommend this company."
Living room Mini-Split
Aquasana home Filtration
Almost no disturbance at EBMUD meter
Navien with filtration to protect the heat exchanger
New house valve and Pressure Reducing Valve

+73

Response time8 hrs
Response rate100%
44 neighbors recently requested a quote
Avatar for Duct Pros
Duct Pros
4.7(
68
)
Air Ducts & Vents - Clean

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2015

Emergency services offered

Small jobs welcome

"Rasu was AMAZING! I had a very unusual clog in my dryer duct and he stayed and worked on it! He took the time to make sure my dryer was working correctly as well. He went above and beyond. I would recommend him over and over! Am using him for my air vents and chimney sweep services. Heâ s honest, fair, ckeaned up after the job was complete, polite and his price was extremely fair ."
SF-Clean Chimney Project
SF-Clean Chimney Project
SF-Clean Chimney Project
Chimney cleaning/sweep
SF-Clean Chimney Project

+14

Response time12 hrs
Response rate91%
Recommended by95%of homeowners
Avatar for Chill Heating & Cooling
Chill Heating & Cooling
4.3(
20
)
Central A/C - Service or RepairCentral A/C - Service or Repair - For Business

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"I recently used Chill Heating & Cooling for my air conditioner maintenance, and I am extremely satisfied! The technicians arrived on time, performed a full diagnostic, cleaning, and refrigerant refill. They worked efficiently and professionally, explaining everything clearly about proper system care. After the service, my AC runs much better?cools the room faster and operates quietly. Excellent service, knowledgeable technicians, and fair pricing! I will definitely use their services again and highly recommend them to anyone looking for reliable AC maintenance."
New Split System
Place for AC
NEW AC Condenser
OLD AC Condenser
NEW AC Condenser

+4

Response time2 hrs
Response rate100%
2 neighbors recently requested a quote
Avatar for ONZONE HEATING & COOLING INC
ONZONE HEATING & COOLING INC
5.0(
6
)
Central A/C - Service or Repair

Serving Castro Valley, CA and surrounding areas

Approved

Free estimates

Warranties offered

Credit card accepted

"The man who came was very polite and nice. He took one look at my heater and knew exactly what to do ! 🥰. I am so grateful for the quick response because my husband is in the hospital and really needed an honest and reliable company to help me out! Thank you for helping me when I needed it the most. 🙏🥰"
ONZONE
Water Heater+HVAC
ONzone installer!!
4 neighbors recently requested a quote
...
Showing 1-10 of 322
Air Conditioning FAQs, answered by experts

Yes, but they don’t feel the same as an AC-cooled room. You’ll feel cool, moist air, opposite from an HVAC system that dries the air as it cools. Ventless units also have less tonnage than alternatives like ductless and central air, which means they aren’t as capable of quickly cooling large spaces or circulating cold air.

Traditional central air conditioning systems require ductwork to circulate air throughout the home. Alternatively, you can add air conditioning with a mini-split ductless air conditioning system, which can be just as energy efficient as a central air conditioner. This type of system consists of two units–an outside unit that holds the compressor and condenser and an indoor unit that holds an air-handler. With multi-zone ductless systems, there are multiple indoor air handlers tied to a single outdoor compressor/condenser, allowing the system to cool multiple rooms.

Dry mode positively impacts indoor air quality by reducing excess moisture, which stops the growth of mold and mildew. By maintaining optimal humidity levels, dry mode creates a less hospitable environment for allergens and airborne pathogens, improving overall air quality. However, it's essential to ensure proper ventilation to prevent stale air accumulation.

Look up your model number online to find additional information. Usually, you can just take a look at the old filter and find the brand name and dimensions to order a new one. When replacing the filter, always check that it’s pointed the right way to match the direction of your airflow. Many filters have arrows on them to help with this step.

No, it’s not normal for AC vents to drip condensation. A sweating AC vent is a sign of something wrong and can lead to issues like air duct rust or mold growth. Your HVAC unit might not be working efficiently because of a dirty filter or clogged ducts. Alternatively, your ductwork might not have adequate insulation, which allows the cool air in the ducts to meet the humid air outside, causing condensation. 

The Castro Valley, CA homeowners’ guide to air conditioning services

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