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Carol Flynn Heating & Cooling
- Work
- Job
- Heating System
“The infinity series is efficient and quiet and its thermostat works fantastic ; last but not least, I was informed of rebates and they filled out all the paper work for us.”
Best HVAC Contractors near Castro Valley, CA
We have one company in Castro Valley on file, and it is on this list, along with 23 from towns including Hayward (3, 5 mi), Pleasanton (3, 10 mi) and Oakland (2, 10 mi).
6 open 24/7 · 15 open weekends · 22 rated 4.5+ · 13 show a license
Data verified October 18, 2026
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Affordable Heating & Air Conditioning
- Hvac
- Fair
“I had multiple issues that required fixing, his approach was methodical and fair.”
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Tech Air
- Crew
- Home
- Fair
“Tech Air installed our heat pump and did a superb job - communication was clear and helpful throughout, pricing was fair, and the team was great to work with start to finish.”
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Rivers Plumbing
- Water Heater
“Steve is a very honest man and after seeing the care to detail him and his son Ryan have done I would trust them for any other future project we will have.”
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Air Design Heating and Cooling
- Prices
“He was spot on with diagnosing our issues and was able to help save the day and get us back to a cool house when our AC completely went out in the middle of the hot summer.”
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Eagle Refrigeration Heating & A/C Inc
The 24 companies listed for Castro Valley, CA work on furnaces, heat pumps and air conditioners. Each profile repeats what the company publishes about its hours, its license and the equipment it fits, alongside ratings and quotes drawn from public reviews.
Area overview: Castro Valley, CA
23 of the 24 companies on this page have a rating, from 4.1 to 5.0 across 9,360 reviews; 17 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (92%), quality (84%) and responsiveness (80%). The topics that come up most in reviews of the companies on this page are "price", "estimates" and "cleanliness". 6 are open around the clock; 15 are open on Saturdays and 13 on Sundays. The services the companies on this page list most often on their websites are furnace installation (2), furnace repair (2), heating (2) and thermostats (2). 13 show a license on their websites; 4 list staff certifications (EPA and NATE) and 5 have a BBB rating of A or A+. Domain records put 15 websites of the companies on this page at ten or more years old; the oldest dates from 1998. 7 offer emergency call-outs; 9 offer financing or payment plans; 13 give free estimates; 10 are family- or locally-owned and 11 list coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Do any heating firms listed for Castro Valley work on Saturdays or Sundays?
Saturday or Sunday hours show up for 15 of the 24 companies here. Saturdays fill with the calls that came in on Friday, so ask whether you are getting a repair slot or a sales visit. Sunday work is usually treated as an emergency call.
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Attic Pros
- Vacuumed
- Debris
- Warranty
“The crew was professional and respectful of my house, did a complete cleaning and vacuuming before leaving, and let me use their ladder to check the work they did when finished.”
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Moore Mechanical Heating & Air Conditioning
- Maintenance
- Tech
- Ducts
“Jesse was very communicative, arrived on-time and provided exactly the service promised and suggested a number rof other improvement opportunities in addition.”
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AIS Heating & Air Conditioning
- Art
- Inspection
- Quote
“Marked contrast to our previous HVAC contract in terms of (1) ability to schedule promptly, (2) clarity of communication, and (3) ultimate happiness with the work done.”
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Albert Nahman Plumbing
- Kitchen Sink
- Bathtub
- Sewer
“I had frustrations with some contractors and inspectors over time, but Drue knows what he is doing and has a great work ethic with a great balance between professionalism and personality.”
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Element Home Solutions
- Estimate
- Crawl Space
- Work
“I had to take an hour off work to lead the inspector around, open up the panels, try to figure out how everything was wired, remove fuses from the two new fuse boxes, etc.”
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Wizard Plumbing
- Window
- Garbage Disposal
- Crawl Space
“Kevin arrived and identified that the water heater was leaking and needed to be replaced, after answering my many questions and making calls around to find the model I wanted.”
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Bay Area Climate Control
- Tech
- Maintenance
- Project
“They have done many services at my parents in Union City (heating & AC), sister's in Newark (heating & AC), and also my old home in Union City (heater in the basement).”
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JJ Heating and Air Conditioning Co
- Information
- Furnace
- HOA
“Diego took the time to talk through potential causes, how the A/C (and water heater) worked, and thoughts (when asked) about remaining system life and replacement alternatives.”
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Heating and Air Experts
- Job
- Diagnosed
- Heater
“Im very happy with this company, i was able to make an appointment within an hour, Baker and Sami were very nice and polite and they fixed our heater same day thank you”
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Ariston Heating and Cooling
- Projects
- Ducts
- Gas
“I've recommended them to a few other folks who are replacing their HVAC systems, and would definitely hire them again if I am ever in need of additional HVAC work.”
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Christy Plumbing
- Price
“Fast, efficient, and very knowledgeable.”
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Jazz Heating
- Thermostat
- Reviews
- Estimate
“He carefully evaluated my issues and guided me through various options, ultimately supporting my decision to go with a new high-power garbage disposal (vrmm vrmm).”
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Chill Heating & Cooling
- Dryer
- Leak
- Ice Maker
“He fixed the AC on same day”
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Superior Mechanical Services
- Heating
- Tech
- UV
“Milton did a good job as lead tech -- showing Saul and Julio the best methods and ways to work with the mechanical and electrical aspects of the project.”
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Power Plumbing
- Inspection
- Tub
- Faucet
“They were able to immediately detect where the water was and had gotten to and quickly repaired the leak itself, which was in a different place than I had thought.”
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Same Day Air Conditioning & Heating
- Tech
- Job
- Hvac
“This business has delivered efficient, skillful and knowledgeable work and service for my furnace and air con systems for the last two years at fair prices.”
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Fuse Hvac
- Price
- Estimate
- Tesla
“He recommended a positional adjustment to make the handle more accessible, which will certainly spare my knuckles from banging the garage trim every time I plug in.”
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All About Air
- Vendors
- Fair
- Clean
“He spent about 1/2 hour scoping out my situation and then installed 1 baffle in my crawl space in order to channel more heat or air from the 2 small bathrooms to my bedroom.”
HVAC, Heating & AC Services in Castro Valley, CA Cost Estimates
Minimum cost
$1896
Maximum cost
$11360
National Average
$5914
Avg Per Hour Rates
$157
$4060
$7838
Typical price range is based on 488 cost profiles
Why these companies made our list
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