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TRUSTED BY KNIGHTSEN, CA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon231
    Verified heating and air conditioning services reviews

Find Heating and air conditioning pros in Knightsen

Avatar for Bell Brothers Plumbing Heating & Air

Bell Brothers Plumbing Heating & Air

4.66(
387
)

Bell Brothers Plumbing Heating & Air

4.66(
387
)
Customers say: Super punctual
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023


Avatar for Sentri Homes

Sentri Homes

New on AngiNew on Angi
Approved Pro

Sentri Homes

New on AngiNew on Angi
Approved Pro
2023 years of experience
Free onsite estimate

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.

Sentri Homes is a full-service contractor delivering high-end home additions, whole-home remodels, new custom builds, luxury kitchens, structural framing, roof replacements, and every major renovation. We assign a dedicated project manager to every job, deliver meticulous craftsmanship with clear communication, and back our work with an industry-leading warranty to ensure complete peace of mind on your largest investments. Our in-house team of licensed builders and master craftsmen consistently earns 5-star reviews by turning big visions into stunning, high-value homes—when you need one trusted partner who truly does it all, we’re the proven choice.


Avatar for Got Watts Electric, Solar & HVAC

Got Watts Electric, Solar & HVAC

4.93(
195
)

Got Watts Electric, Solar & HVAC

4.93(
195
)
Customers say: Super punctual
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers

Commitment to quality is the backbone of Got Watts? Electric, Solar & HVAC. Each project is an expression of our passion for our trade, and our simple desire to do it once and do it right. We are licensed, bonded, insured and all personnel complete a mandatory background screening; to ensure our services not only look good but comply with all local, State and county regulations, we are committed to the personal health and safety of every client and team member. The Got Watts Team offers decades of experience in all aspects of construction, remodeling, and alterations; further, we proudly maintain our position of expertise in the rapidly emerging market of ‘residential electrification’. While the concept may be new to most, we have been designing and installing clean, reliable, and sustainable solutions. We only offer what we would use ourselves and we only perform work that would be safe for our families, a simple and timeless approach to ensuring you are satisfied with your service from Got Watts Electric, Solar & HVAC.

"We had a wonderful experience with Got Watts. They installed 29 new solar panels for us and also upgraded our HVAC system (removed furnace/AC and installed new heat pump and air handler). We loved working with Eric, Jedd and Lee (HVAC), as well as Sam, Lindsay, Jeremy (solar). They were all responsive, professional, kind, knowledgeable, thorough. They even helped us through issues with PG&E and the rebate process. We highly recommend Got Watts."

Sarah K on February 2022

Commitment to quality is the backbone of Got Watts? Electric, Solar & HVAC. Each project is an expression of our passion for our trade, and our simple desire to do it once and do it right. We are licensed, bonded, insured and all personnel complete a mandatory background screening; to ensure our services not only look good but comply with all local, State and county regulations, we are committed to the personal health and safety of every client and team member. The Got Watts Team offers decades of experience in all aspects of construction, remodeling, and alterations; further, we proudly maintain our position of expertise in the rapidly emerging market of ‘residential electrification’. While the concept may be new to most, we have been designing and installing clean, reliable, and sustainable solutions. We only offer what we would use ourselves and we only perform work that would be safe for our families, a simple and timeless approach to ensuring you are satisfied with your service from Got Watts Electric, Solar & HVAC.

"We had a wonderful experience with Got Watts. They installed 29 new solar panels for us and also upgraded our HVAC system (removed furnace/AC and installed new heat pump and air handler). We loved working with Eric, Jedd and Lee (HVAC), as well as Sam, Lindsay, Jeremy (solar). They were all responsive, professional, kind, knowledgeable, thorough. They even helped us through issues with PG&E and the rebate process. We highly recommend Got Watts."

Sarah K on February 2022


Avatar for Valley Solar Inc

Valley Solar Inc

5.00(
81
)

Valley Solar Inc

5.00(
81
)
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Valley Solar is proud to offer our our customers a complete turn-key energy solution from a detailed site analysis and energy audit through system design, engineering, and installation. We even take care of the building permits and rebate applications! In addition to offering the most advanced solar technology for your home and business, Valley Solar offers home battery backup solutions and EV charging stations to complement your solar system. We are the most knowledgeable and experienced solar contractor in the greater Sacramento area, with over 20 years of combined experience. We are NABCEP certified and a SMUD-Approved contractor. Our company president has instructed solar design and installation courses at a local college. We offer our customers a no-pressure sales process featuring a knowledgeable Project Manager who can give you the expert advice your project deserves. When you are serious about solar, call Valley Solar for a free estimate.

"exceeded expectation"

Jack Y on October 2023

Valley Solar is proud to offer our our customers a complete turn-key energy solution from a detailed site analysis and energy audit through system design, engineering, and installation. We even take care of the building permits and rebate applications! In addition to offering the most advanced solar technology for your home and business, Valley Solar offers home battery backup solutions and EV charging stations to complement your solar system. We are the most knowledgeable and experienced solar contractor in the greater Sacramento area, with over 20 years of combined experience. We are NABCEP certified and a SMUD-Approved contractor. Our company president has instructed solar design and installation courses at a local college. We offer our customers a no-pressure sales process featuring a knowledgeable Project Manager who can give you the expert advice your project deserves. When you are serious about solar, call Valley Solar for a free estimate.

"exceeded expectation"

Jack Y on October 2023


Avatar for AppliancePartsPros.com

AppliancePartsPros.com

4.73(
287
)

AppliancePartsPros.com

4.73(
287
)
Customers say: Quick response
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers

Since 1999, we've helped millions of do-it-yourselfers save money and fix their broken appliances quickly by providing quality appliance parts and free repair advice. We are only an online appliance parts retailer that offers a 365 day warranty and fast shipping. We also offer technical advice and diagnosis totally free 6 days a week. If you are interested in repairing your own appliance, please call us at 1-877-477-7278 or click live chat on our web site. We will help diagnose the problem and provide you with all the necessary information for the repair free of charge. It's better with the Pros!™ Avoid costly service calls - visit us at http://www.appliancepartspros.com

"Beware of shipping issues with this company. Ordered an ice maker installation kit on 10/10/25. Shipping was due no later than 10/20 according to company and FedEx tracking. FedEx tracking showed the package at their facility for 8 days without moving beginning on 10/15. Called FedEx 3 times. Each time they said they cannot find package and I have to contact shipper. Shipper has to make a claim, they will not mark it as lost. Called Appliance Parts Pros twice. Each time they say FedEx has to mark package lost before they will do anything. They also state they have to wait 14 days from them before doing anything because of their contract with FedEx. I don't care about their contract, I want what was ordered and paid for. Just going in circles with them and FedEX. If they shipped after 14 days it would be 22 days from that point, 32 days from the date of order if they shipped it that day. There was a deadline for installing this part before tenants arrive. They did not care, would not m"

Ron R on October 2025

Since 1999, we've helped millions of do-it-yourselfers save money and fix their broken appliances quickly by providing quality appliance parts and free repair advice. We are only an online appliance parts retailer that offers a 365 day warranty and fast shipping. We also offer technical advice and diagnosis totally free 6 days a week. If you are interested in repairing your own appliance, please call us at 1-877-477-7278 or click live chat on our web site. We will help diagnose the problem and provide you with all the necessary information for the repair free of charge. It's better with the Pros!™ Avoid costly service calls - visit us at http://www.appliancepartspros.com

"Beware of shipping issues with this company. Ordered an ice maker installation kit on 10/10/25. Shipping was due no later than 10/20 according to company and FedEx tracking. FedEx tracking showed the package at their facility for 8 days without moving beginning on 10/15. Called FedEx 3 times. Each time they said they cannot find package and I have to contact shipper. Shipper has to make a claim, they will not mark it as lost. Called Appliance Parts Pros twice. Each time they say FedEx has to mark package lost before they will do anything. They also state they have to wait 14 days from them before doing anything because of their contract with FedEx. I don't care about their contract, I want what was ordered and paid for. Just going in circles with them and FedEX. If they shipped after 14 days it would be 22 days from that point, 32 days from the date of order if they shipped it that day. There was a deadline for installing this part before tenants arrive. They did not care, would not m"

Ron R on October 2025


Avatar for Bear Mechanical Inc

Bear Mechanical Inc

5.00(
37
)

Bear Mechanical Inc

5.00(
37
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

We are a family owned and operated heating and air conditioning company who excels in giving customers fast results with great customer service. We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule a free estimate today.

"the service and the job was excellent, even the price was higher than the other competitors i decided to go with them because of the high level of communication and professionalism, they are a good investment that will last for the next 10-12 years."

Jonathan S on October 2022

We are a family owned and operated heating and air conditioning company who excels in giving customers fast results with great customer service. We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule a free estimate today.

"the service and the job was excellent, even the price was higher than the other competitors i decided to go with them because of the high level of communication and professionalism, they are a good investment that will last for the next 10-12 years."

Jonathan S on October 2022


Avatar for V & G Builders

V & G Builders

4.93(
44
)

V & G Builders

4.93(
44
)
Customers say: True professional
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers

V&G Builders was established in 2006 and is a general contractor providing construction services in terms of consulting,bathroom remodeling,kitchen remodeling,floor installation,porch and decks,window replacing,permit/zoning applications,etc. V&G Builders is a leader in providing value added construction services to our customers by creating a successful partnership with them to throughout the construction process. Our goal is to establish lasting relationships with our customers by exceeding their expectations and gaining their trust trough exceptional performance by every member of the construction team. We proudly serve the customers from Bay Area with competitive market prices and high value professionalism.

"Robert from V&G Construction transformed my 2B2B condo with exceptional skill and professionalism. Recommended by a friend, he expertly guided me through every step of the remodeling process, from securing permits to selecting materials and paint colors. Despite my initial reservations about remodeling, Robert's straightforward approach made it far more manageable. His practical advice proved invaluable, and he consistently exceeded my expectations with his work. Robert's craftsmanship is truly top-notch, evident in every detail of the finished project. One standout moment was when he and his team efficiently rearranged my pantry and refrigerator to accommodate the dimensions of the new fridge I purchased. Their quick action and attention to detail ensured a seamless transition, and I couldn't be happier with the result. Not only am I thrilled with the outcome of my condo, but several neighbors who witnessed the transformation have also expressed interest in hiring Robert for their own projects. His reputation for excellence precedes him, and I wholeheartedly endorse V&G Construction to anyone in need of remodeling assistance."

Hui Ling T on March 2024

V&G Builders was established in 2006 and is a general contractor providing construction services in terms of consulting,bathroom remodeling,kitchen remodeling,floor installation,porch and decks,window replacing,permit/zoning applications,etc. V&G Builders is a leader in providing value added construction services to our customers by creating a successful partnership with them to throughout the construction process. Our goal is to establish lasting relationships with our customers by exceeding their expectations and gaining their trust trough exceptional performance by every member of the construction team. We proudly serve the customers from Bay Area with competitive market prices and high value professionalism.

"Robert from V&G Construction transformed my 2B2B condo with exceptional skill and professionalism. Recommended by a friend, he expertly guided me through every step of the remodeling process, from securing permits to selecting materials and paint colors. Despite my initial reservations about remodeling, Robert's straightforward approach made it far more manageable. His practical advice proved invaluable, and he consistently exceeded my expectations with his work. Robert's craftsmanship is truly top-notch, evident in every detail of the finished project. One standout moment was when he and his team efficiently rearranged my pantry and refrigerator to accommodate the dimensions of the new fridge I purchased. Their quick action and attention to detail ensured a seamless transition, and I couldn't be happier with the result. Not only am I thrilled with the outcome of my condo, but several neighbors who witnessed the transformation have also expressed interest in hiring Robert for their own projects. His reputation for excellence precedes him, and I wholeheartedly endorse V&G Construction to anyone in need of remodeling assistance."

Hui Ling T on March 2024


Avatar for Attic Masters insulation Services

Attic Masters insulation Services

4.87(
97
)

Attic Masters insulation Services

4.87(
97
)
Customers say: Super punctual
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers

Attic Masters Insulation Services specializes in providing high-quality insulation solutions for residential properties. Our services include insulation removal, installation, and attic cleaning, focusing on energy efficiency and comfort. With a commitment to eco-friendly materials and practices, we ensure environmentally responsible solutions that enhance indoor air quality. Our experienced team assesses your specific needs and offers customized insulation options tailored to your home. We pride ourselves on delivering reliable service, customer satisfaction, and maintaining a clean work environment. Choose Attic Masters to improve your home’s energy efficiency and comfort while reducing energy costs for a healthier living space.

"i can only say good things about working with Attic masters. Great communication, They came on time, protected our floors and hallway from insulation dust, took pictures of the before and after for us so we can get the rebate. overall, very easy and stress free company to work with. I would definitely use again, it was a pleasure to work with true professionals."

Victor H on October 2021

Attic Masters Insulation Services specializes in providing high-quality insulation solutions for residential properties. Our services include insulation removal, installation, and attic cleaning, focusing on energy efficiency and comfort. With a commitment to eco-friendly materials and practices, we ensure environmentally responsible solutions that enhance indoor air quality. Our experienced team assesses your specific needs and offers customized insulation options tailored to your home. We pride ourselves on delivering reliable service, customer satisfaction, and maintaining a clean work environment. Choose Attic Masters to improve your home’s energy efficiency and comfort while reducing energy costs for a healthier living space.

"i can only say good things about working with Attic masters. Great communication, They came on time, protected our floors and hallway from insulation dust, took pictures of the before and after for us so we can get the rebate. overall, very easy and stress free company to work with. I would definitely use again, it was a pleasure to work with true professionals."

Victor H on October 2021


Avatar for Atlas Heating & Air Conditioning Co

Atlas Heating & Air Conditioning Co

4.86(
280
)

Atlas Heating & Air Conditioning Co

4.86(
280
)
Customers say: Super punctual
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers

Atlas Heating and Air Conditioning is located in same West Oakland building as it was in 1927. Atlas employs an average of 35 people (seven for 25 + years) and has separate repair/maintenance and installation departments. Residential maintenance agreements and commercial service contracts are popular, also our reminder service. Energy Upgrade and California First (PACE Program) certified. Visa/Mastercard/Discover available, also financing.

"We had a great experience having our furnace replaced with Atlas Heating and Air Conditioning. A different company originally recommended that our furnace be replaced and we got estimates from a total of three companies. Atlas was reasonably priced. The estimator Keith was very responsive and patiently answered a number of questions about various options. He gave frank assessments about what would be involved in a two-stage furnace, higher-efficiency furnace, central A/C in addition, or a heat pump. The installer Joe arrived right on time, worked all day, clearly explained our new thermostat, and left the work area cleaner than he found it. He also patiently answered my questions about maintenance. We're still waiting to complete the permit and MERS inspection but overall we've had a great experience."

David P on October 2019

Atlas Heating and Air Conditioning is located in same West Oakland building as it was in 1927. Atlas employs an average of 35 people (seven for 25 + years) and has separate repair/maintenance and installation departments. Residential maintenance agreements and commercial service contracts are popular, also our reminder service. Energy Upgrade and California First (PACE Program) certified. Visa/Mastercard/Discover available, also financing.

"We had a great experience having our furnace replaced with Atlas Heating and Air Conditioning. A different company originally recommended that our furnace be replaced and we got estimates from a total of three companies. Atlas was reasonably priced. The estimator Keith was very responsive and patiently answered a number of questions about various options. He gave frank assessments about what would be involved in a two-stage furnace, higher-efficiency furnace, central A/C in addition, or a heat pump. The installer Joe arrived right on time, worked all day, clearly explained our new thermostat, and left the work area cleaner than he found it. He also patiently answered my questions about maintenance. We're still waiting to complete the permit and MERS inspection but overall we've had a great experience."

David P on October 2019


Avatar for HVAC Utor Services

HVAC Utor Services

5.00(
30
)

HVAC Utor Services

5.00(
30
)
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

HEATING,COOLING,REFRIGERATION Family owned, heating and cooling, I got my expertise on working with big companies around Bay Area, I also work for contractors, I basically do the work myself and I bring my crew with me. I do repair, install, commercial and residential. I also offer air duct cleaning, dryer vent too. I also install, replace water heaters, regular or tankless. free diagnostic and estimate for first time customer. Contractor license # 1027164 Bonded and insured We work all contra costa Area ,Alameda county. Concord,Walnut Creek,pleasant hill,Martinez,Alamo San Ramón,Moraga,Orinda,Lafayette,antioch,Pittsburg, Brentwood..

"Went very well. Showed up when promised and completed as promised. I would hire Utor Services again. Ron Livermore."

Ron M on August 2020

HEATING,COOLING,REFRIGERATION Family owned, heating and cooling, I got my expertise on working with big companies around Bay Area, I also work for contractors, I basically do the work myself and I bring my crew with me. I do repair, install, commercial and residential. I also offer air duct cleaning, dryer vent too. I also install, replace water heaters, regular or tankless. free diagnostic and estimate for first time customer. Contractor license # 1027164 Bonded and insured We work all contra costa Area ,Alameda county. Concord,Walnut Creek,pleasant hill,Martinez,Alamo San Ramón,Moraga,Orinda,Lafayette,antioch,Pittsburg, Brentwood..

"Went very well. Showed up when promised and completed as promised. I would hire Utor Services again. Ron Livermore."

Ron M on August 2020

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Heating and Air Conditioning questions, answered by experts

It’s never a good idea to run your AC without a filter, even just for a night. The filter defends your HVAC system from the dust, dirt, debris, and other grime in your home. Without a filter, those contaminants are more likely to get inside your system and potentially damage it. 

Yes, you should turn off your AC if it’s leaking. Turning off the AC will prevent more condensation from leaking from your unit, and it will also reduce the increased strain on the system if a damaged internal component or a lack of refrigerant is the culprit. As soon as you notice a leak, turn off the system and investigate the source of the leak or call a pro to inspect it.

Clean the filter regularly, inspect seals, and store the unit properly during the off-season.

There are a few reasons your AC is running but not cooling your room. Thermostat issues and dust and debris, which can clog your system, are common problems. It could also be a broken component, such as a compressor, blower fan, or evaporator coils. You’ll need to call a pro to diagnose the issue.

The cost of R32 refrigerant is about the same as the cost of R410A refrigerant, the most widely available type of refrigerant today. However, R32 systems use about 20% less refrigerant than R410A systems, making the refrigerant less expensive overall.

The Knightsen, CA homeowners’ guide to heating and air conditioning services

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