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Central a/c service or repairers in Castro Valley

Hao Wu
869 Chenault Way
New on HomeAdvisorNew on Angi
Approved Pro
Hao Wu
869 Chenault Way
New on AngiNew on HomeAdvisor
Approved Pro
7 years of experience
Free onsite estimate

Hao Wu is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you!

Hao Wu is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you!


Avatar for Perfect Star Heating and Air Conditioning
Perfect Star Heating and Air Conditioning
4415 Cowell Road
4.90(
235
)
Approved Pro
Perfect Star Heating and Air Conditioning
4415 Cowell Road
4.90(
235
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers
349 local quotes requested

With over 30 years of experience, Perfect Star Heating, Cooling, & Electrical is a locally owned and operated family business serving Alameda & Contra Costa County. We service all makes and models, offering top-quality comfort and energy efficiency solutions. Specializing in Furnace/Heating, Air Conditioning, and Ductless Mini-Split installation, we also provide repair and maintenance for Central HVAC systems, Ductwork, Indoor Air Quality, Electrical Repair & Installation, and Solar Installation. Free estimates are available for HVAC system replacement, new installations, and solar solutions. As a Lennox Premier Dealer, Daikin Comfort Pro, and WellAir Elite dealer, we are Diamond Certified, hold an A+ BBB Rating, and have been voted “The Best Heating & Air Company” and “The Most Community-Minded Company” by The Press in Brentwood, CA for two years. We are also SFGATE’s Best of the Bay Area Heating & A/C Service provider.

"5 star service!!! A crew of 3 arrived, Brandon H, Nestor C and Anthony A. They did an excellent job and very hard workers. I am thrilled with their professionalism, hot tips and work ethic. Will definitely recommend them!! Thank you again!!!"

Lisa V on May 2025

With over 30 years of experience, Perfect Star Heating, Cooling, & Electrical is a locally owned and operated family business serving Alameda & Contra Costa County. We service all makes and models, offering top-quality comfort and energy efficiency solutions. Specializing in Furnace/Heating, Air Conditioning, and Ductless Mini-Split installation, we also provide repair and maintenance for Central HVAC systems, Ductwork, Indoor Air Quality, Electrical Repair & Installation, and Solar Installation. Free estimates are available for HVAC system replacement, new installations, and solar solutions. As a Lennox Premier Dealer, Daikin Comfort Pro, and WellAir Elite dealer, we are Diamond Certified, hold an A+ BBB Rating, and have been voted “The Best Heating & Air Company” and “The Most Community-Minded Company” by The Press in Brentwood, CA for two years. We are also SFGATE’s Best of the Bay Area Heating & A/C Service provider.

"5 star service!!! A crew of 3 arrived, Brandon H, Nestor C and Anthony A. They did an excellent job and very hard workers. I am thrilled with their professionalism, hot tips and work ethic. Will definitely recommend them!! Thank you again!!!"

Lisa V on May 2025


Avatar for 411 Heating & AC, LLC
411 Heating & AC, LLC
6005 Golden Eagle Way
4.60(
171
)
Approved Pro
411 Heating & AC, LLC
6005 Golden Eagle Way
4.60(
171
)
Approved Pro
Customers say: True professional
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
22 local quotes requested

Thank you for choosing 411 Heating & AC, LLC, Contra Costa Countys’ premiere HVAC service professional. For nearly a decade, we've specialized in all your heating and air conditioning needs. We proudly serve Concord and the surrounding areas. We look forward to earning your business.

"Our heater broke and my husband is medically fragile and It was 58 degrees INSIDE. I needed help ASAP. He's 88 and I'm 77 and calling people was frustrating until I checked top Angie reviews for my area. Even then, two out of three failed on ability to respond in less than 7-10 days. Another said we can come assess in three days and then schedule your repairs. 411 came within hours and had us heating up with a brand new, quieter, and quicker system the next day! Can't thank them enough. And the pricing was very fair based on checking with others in our neighborhood and relatives who have had to replace their systems."

Linda M on February 2025

Thank you for choosing 411 Heating & AC, LLC, Contra Costa Countys’ premiere HVAC service professional. For nearly a decade, we've specialized in all your heating and air conditioning needs. We proudly serve Concord and the surrounding areas. We look forward to earning your business.

"Our heater broke and my husband is medically fragile and It was 58 degrees INSIDE. I needed help ASAP. He's 88 and I'm 77 and calling people was frustrating until I checked top Angie reviews for my area. Even then, two out of three failed on ability to respond in less than 7-10 days. Another said we can come assess in three days and then schedule your repairs. 411 came within hours and had us heating up with a brand new, quieter, and quicker system the next day! Can't thank them enough. And the pricing was very fair based on checking with others in our neighborhood and relatives who have had to replace their systems."

Linda M on February 2025


Avatar for Smart Heating and Air Conditioning, Inc.
Smart Heating and Air Conditioning, Inc.
1717 Solano Way #7
4.83(
18
)
Approved Pro
Smart Heating and Air Conditioning, Inc.
1717 Solano Way #7
4.83(
18
)
Approved Pro
Super Service Award
Customers say: Quality work
4 years of experience
Free onsite estimate

Smart Heating and Air is proud to be a locally owned and operated business that provides residential HVAC installation, replacement and service. With years of experience and unmatched expertise, we can help with any and all of your heating and cooling needs. Since opening our doors we have built our business on providing customers with the highest quality products and service at a fair price. You can count on us to be timely, tidy and when the job is done, that you will be 100% satisfied with the work. Let us show you the Smart Heating and Air advantage, get in touch today!

"They do an outstanding detailed job on examining your equipment and explain the problems that are going on and problems that might arise and then back it up with pictures. They send all this info to you via your computor. They also do a great job cleaning up after they are finished. They are very professional!"

marilyn m on April 2024

Smart Heating and Air is proud to be a locally owned and operated business that provides residential HVAC installation, replacement and service. With years of experience and unmatched expertise, we can help with any and all of your heating and cooling needs. Since opening our doors we have built our business on providing customers with the highest quality products and service at a fair price. You can count on us to be timely, tidy and when the job is done, that you will be 100% satisfied with the work. Let us show you the Smart Heating and Air advantage, get in touch today!

"They do an outstanding detailed job on examining your equipment and explain the problems that are going on and problems that might arise and then back it up with pictures. They send all this info to you via your computor. They also do a great job cleaning up after they are finished. They are very professional!"

marilyn m on April 2024


Avatar for Eagle Air Conditioning, Inc.
Eagle Air Conditioning, Inc.
5542 Brisa Street, Unit B
4.68(
25
)
Approved Pro
Eagle Air Conditioning, Inc.
5542 Brisa Street, Unit B
4.68(
25
)
Approved Pro
Customers say: Quick response
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers
73 local quotes requested

Eagle Air has been in business since 1993 and is a recognized authority in HVAC design, installation, repair, maintenance, and replacement of residential and commercial heating and air conditioning systems. Eagle Air offers equipment and certified professional service.

"Good"

Ani B on August 2024

Eagle Air has been in business since 1993 and is a recognized authority in HVAC design, installation, repair, maintenance, and replacement of residential and commercial heating and air conditioning systems. Eagle Air offers equipment and certified professional service.

"Good"

Ani B on August 2024


Avatar for Air Sharks
Air Sharks
1560 N. 4th St
5.00(
5
)
Approved Pro
Air Sharks
1560 N. 4th St
5.00(
5
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

Air Sharks LLC provides a wide range of HVAC services for residential clients throughout the South Bay. In addition to installing, repairing, and maintaining heating and air conditioning systems made by industry leaders like Daikin and Lennox, the company offers various services that are designed to improve indoor air quality, including ductwork inspection and cleaning. Owner Khaled Alsaka credits much of Air Sharks’ success to its passion for transforming the HVAC process with insightful education, collaborative solutions and top-tier products. “As a pioneering force in the industry, we leverage our extensive expertise to provide our customers with seamless guidance,” he says. “Our dedication to excellence motivates us to continuously exceed expectations, ensuring every interaction reflects our unwavering commitment to delivering five-star service.” Air Sharks offers personalized consultations so it can provide each job with tailored heating and cooling solutions, which Mr. Alsaka says is important for ensuring positive results. “We take great pride in our craftsmanship and attention to detail. Every phase of our process allows us to showcase our expertise, resulting in highly satisfied customers who are eager to share their experience with others.

"Very professional in both sales of the right product AND flawless and timely installation. You can stop your searching for vendors...stop sns start with Air Sharks."

Michael S on March 2025

Air Sharks LLC provides a wide range of HVAC services for residential clients throughout the South Bay. In addition to installing, repairing, and maintaining heating and air conditioning systems made by industry leaders like Daikin and Lennox, the company offers various services that are designed to improve indoor air quality, including ductwork inspection and cleaning. Owner Khaled Alsaka credits much of Air Sharks’ success to its passion for transforming the HVAC process with insightful education, collaborative solutions and top-tier products. “As a pioneering force in the industry, we leverage our extensive expertise to provide our customers with seamless guidance,” he says. “Our dedication to excellence motivates us to continuously exceed expectations, ensuring every interaction reflects our unwavering commitment to delivering five-star service.” Air Sharks offers personalized consultations so it can provide each job with tailored heating and cooling solutions, which Mr. Alsaka says is important for ensuring positive results. “We take great pride in our craftsmanship and attention to detail. Every phase of our process allows us to showcase our expertise, resulting in highly satisfied customers who are eager to share their experience with others.

"Very professional in both sales of the right product AND flawless and timely installation. You can stop your searching for vendors...stop sns start with Air Sharks."

Michael S on March 2025


Avatar for HVAC Gurus
HVAC Gurus
75 PHELAN AVE
4.39(
36
)
Approved Pro
HVAC Gurus
75 PHELAN AVE
4.39(
36
)
Approved Pro
Customers say: Super punctual
1637 local quotes requested
9 years of experience

Call for a free estimate! HVAC & Insulation Gurus have an extensive background in HVAC and insulation services. With fifteen years of experience on the field, the Gurus have earned a reputation as trusted installers. Our mission is to provide both our residential and commercial customers with reliability, expert advice, quality work integrity and an outstanding service. We dedicate ourselves 110% to our customers not only to achieve energy efficiency, comfort, and safety, but also to establish a friendship. Everybody needs a Guru in the family. Let us be yours!

"Great! Super knowledgeable and helpful."

Catherine M on March 2025

Call for a free estimate! HVAC & Insulation Gurus have an extensive background in HVAC and insulation services. With fifteen years of experience on the field, the Gurus have earned a reputation as trusted installers. Our mission is to provide both our residential and commercial customers with reliability, expert advice, quality work integrity and an outstanding service. We dedicate ourselves 110% to our customers not only to achieve energy efficiency, comfort, and safety, but also to establish a friendship. Everybody needs a Guru in the family. Let us be yours!

"Great! Super knowledgeable and helpful."

Catherine M on March 2025


Avatar for Qualtech Heating & Cooling
Qualtech Heating & Cooling
4115 Blackhawk Plaza Circle
3.00(
4
)
Approved Pro
Qualtech Heating & Cooling
4115 Blackhawk Plaza Circle
3.00(
4
)
Approved Pro
Customers say: Quick response
713 local quotes requested
18 years of experience

With over 17 years of experience in the Bay Area, we are proud to offer an extensive array of HVAC solutions for all you indoor comfort needs. Our team of professionally trained and certified advisors and installers provide quality workmanship and excellent customer service. We are determined to go the extra mile to ensure that all of our customers are happy homeowners! We work closely with each individual client to fully understand their unique needs, preferences and budget. Our commitment to customer satisfaction means we won't rest until you are 100% satisfied. Specializing in heating and air conditioning replacement and repairs, furnace and heat pump upgrades and ductless systems. We also provide in depth assessments for air duct repair and replacements. Our Innovative approach to newer HVAC technology for home additions, ADU's and eco-concious homes is unparalled in the local industry.

"Tech said that the Freon leaked out and that the compressor burned out because of it. Quoted $4800 to replace compressor and recharge, or $7,000 for a new AC unit. Got a second opinion and hired a handyman. Turns out the breaker was tripped and needed some fiddling with. AC works great now. Can’t believe they were going to lie about what was wrong to replace the whole AC. Just because it was an old unit. Get a second opinion for them if they tell you something similar."

John N on July 2018

With over 17 years of experience in the Bay Area, we are proud to offer an extensive array of HVAC solutions for all you indoor comfort needs. Our team of professionally trained and certified advisors and installers provide quality workmanship and excellent customer service. We are determined to go the extra mile to ensure that all of our customers are happy homeowners! We work closely with each individual client to fully understand their unique needs, preferences and budget. Our commitment to customer satisfaction means we won't rest until you are 100% satisfied. Specializing in heating and air conditioning replacement and repairs, furnace and heat pump upgrades and ductless systems. We also provide in depth assessments for air duct repair and replacements. Our Innovative approach to newer HVAC technology for home additions, ADU's and eco-concious homes is unparalled in the local industry.

"Tech said that the Freon leaked out and that the compressor burned out because of it. Quoted $4800 to replace compressor and recharge, or $7,000 for a new AC unit. Got a second opinion and hired a handyman. Turns out the breaker was tripped and needed some fiddling with. AC works great now. Can’t believe they were going to lie about what was wrong to replace the whole AC. Just because it was an old unit. Get a second opinion for them if they tell you something similar."

John N on July 2018


Avatar for Luiz M Construction
Luiz M Construction
123 Main St.
5.00(
1
)
Approved Pro
Luiz M Construction
123 Main St.
5.00(
1
)
Approved Pro
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
19 years of experience

We specialize in Bathroom and Kitchen remodeling, including flooring, tile, hardware, and more! We offer a diverse range of services tailored to meet the unique needs of every customer. We take a personalized approach to each project. We work closely with our clients to understand their vision, preferences, and budgetary requirements. We strive to exceed expectations by delivering exceptional service, great quality work, and professionalism on every job. Read more below on all the services we offer and contact us with any questions or to schedule a free estimate today!

"Timely, tidy, willing to cooperate, happy with the result. Very happy!"

Jean B on October 2024

We specialize in Bathroom and Kitchen remodeling, including flooring, tile, hardware, and more! We offer a diverse range of services tailored to meet the unique needs of every customer. We take a personalized approach to each project. We work closely with our clients to understand their vision, preferences, and budgetary requirements. We strive to exceed expectations by delivering exceptional service, great quality work, and professionalism on every job. Read more below on all the services we offer and contact us with any questions or to schedule a free estimate today!

"Timely, tidy, willing to cooperate, happy with the result. Very happy!"

Jean B on October 2024


Avatar for Albert Nahman Plumbing, Heating, and Cooling
Albert Nahman Plumbing, Heating, and Cooling
3333 Martin Luther King Jr Way
4.45(
683
)
Approved Pro
Albert Nahman Plumbing, Heating, and Cooling
3333 Martin Luther King Jr Way
4.45(
683
)
Approved Pro
Customers say: Super punctual
2699 local quotes requested
44 years of experience

Albert Nahman Services was founded in 1981 and has been serving Berkeley, CA and it surrounding areas in all their plumbing and HVAC needs. Each of our technicians went through rigorous training so we can guarantee that you will be receiving the proper service. We are also insured and supply a warranty for our parts for five years and up to twenty years on an re-piping or sewer replacement. Call us now to make your appointment!

"It was fine but to expensive sorry Ivan’s affort that much"

Rene T on May 2025

Albert Nahman Services was founded in 1981 and has been serving Berkeley, CA and it surrounding areas in all their plumbing and HVAC needs. Each of our technicians went through rigorous training so we can guarantee that you will be receiving the proper service. We are also insured and supply a warranty for our parts for five years and up to twenty years on an re-piping or sewer replacement. Call us now to make your appointment!

"It was fine but to expensive sorry Ivan’s affort that much"

Rene T on May 2025

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Central a/c service or repairs FAQs

Yes, a once-a-year tune-up keeps the system efficient and helps it last longer. During the visit, a technician cleans coils, checks electrical connections, and swaps or cleans the filter. Catching small issues now stops bigger, pricier failures later, so that a quick appointment saves money and stress over the life of the unit.

Changing your AC filter every 30 days is necessary to maintain optimal performance and high indoor air quality. Regular filter replacement prevents dust buildup, ensures efficient airflow, and protects the system from stress that could lead to costly repairs. This disciplined maintenance routine not only boosts energy efficiency but also prolongs the lifespan of your unit by safeguarding its critical components.

An HVAC service plan is worth the cost, especially if you forget to schedule maintenance on your own. A service plan locks in yearly (or twice-yearly) visits, allowing a professional to identify small problems early, clean key components, and maintain energy efficiency. Many plans also include minor repairs or priority scheduling, which can pay for themselves if an unexpected issue pops up.

In a pre-season service visit, your technician gives your system a top-to-bottom check before peak season hits. Expect a filter change, thermostat test, condenser-line flush, electrical-connection check, and coil cleaning. They also tighten loose parts and make minor adjustments so the unit fires up without surprises when temperatures swing. That quick tune-up cuts the risk of mid-season breakdowns and keeps energy use in line.

The homeowners guide to central a/c service or repairs
From average costs to expert advice, get all the answers you need to get your job done.
Technician services outside AC units and generator
Apr 30, 2025
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Budget for HVAC maintenance costs based on factors such as unit age, time of year, repair task, warranties, condition, service plans, and more.
professional installing home humidifier system
Apr 29, 2025
Apr 29, 2025
Budget for whole-house dehumidifier costs based on factors such as unit type, capacity, efficiency, ductwork, drainage, labor, permits, and more.
Technician performing annual ac tune up
Apr 29, 2025
Apr 29, 2025
Budget for AC evaporator coil replacement costs based on factors such as your AC unit’s tonnage, coil style, professional labor rates, and more.
home air conditioner being recharged with freon
Apr 26, 2025
Apr 26, 2025
Need an AC Recharge? Here’s how much it costs, what factors affect cost, and what to expect.
A boy changing thermostat’s temperature using a smartphone
Apr 25, 2025
Apr 25, 2025
Budget for AC coil cleaning costs based on factors such as cleaning frequency, coil type, cleaning method, accessibility, ongoing maintenance, and more.
Technician checking AC condenser
Apr 22, 2025
Apr 22, 2025
Budget for the cost to replace an AC condenser based on factors such as unit size, repair type, brand, accessibility, labor, and more.
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