Ontario, CA

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Ontario Plumbing, Heating & Air Conditioning Experts

Full Plumber Services In & Around Ontario

Ontario is one of the oldest communities in the Inland Empire. So much of Ontario has unique, historical homes and buildings. A special city needs a special plumber that can service, replace and help you maintain all the plumbing in your home – old or new. At Klaus & Sons, a trusted name in the industry, we’re proud to bring our expertise from Montclair, CA, to serve the thriving community of Ontario. With years of experience, we are committed to providing exceptional heating, cooling, and plumbing solutions to residents and businesses in Ontario.

Give us a call 909-982-5698 or fill out our contact form for immediate assistance.

Emergency Plumbing:

For those unexpected plumbing emergencies, Klaus & Sons is here to provide prompt and reliable emergency plumbing services. We understand that issues can arise at any time, and our experienced team is ready to assist you 24/7.

Air Conditioning Installation and Repair:

When the summer heat sets in, having a reliable air conditioning system is essential. Our team specializes in the installation and repair of energy-efficient AC units, ensuring you stay cool and comfortable when the temperatures rise. We’re here to make your home a haven from the summer sun.

Heating Installation and Repair:

Stay warm and cozy during the colder months with our expert heating installation and repair services. Whether you need a new heating system installed or require prompt repairs to your existing one, Klaus & Sons has you covered. Our skilled technicians ensure your home remains comfortable year-round.

Residential Plumbing Services:

From routine maintenance to complex plumbing issues, Klaus & Sons is your trusted partner for all your residential plumbing needs. Leaky faucets, clogged drains, and more – we’ve got the solutions to keep your water systems flowing smoothly.

Water Heater Repair & Replacement:

Our expert technicians are skilled in water heater repair and replacement services. We ensure your hot water needs are met, providing you with reliable access to hot water whenever you need it.

Why Choose Klaus & Sons:

  • Experienced Team: Our skilled technicians are highly trained and experienced in the HVAC and plumbing fields. You can trust us to provide efficient and reliable services.
  • Customer-Centric Approach: We value your satisfaction and work closely with you to meet your specific needs and budget.
  • Quality Products: We use top-quality products and materials, ensuring the longevity and effectiveness of our installations and repairs.
  • Emergency Services: We understand that heating, cooling, and plumbing issues can arise at any time. Our emergency services are available 24/7 to address urgent problems promptly.

Contact Us:

When you choose Klaus & Sons, you’re choosing excellence in HVAC and plumbing services. We’re dedicated to ensuring the comfort and functionality of your Ontario, CA property. For reliable, professional, and friendly service, contact us today at 909-982-5698 to schedule an appointment or request a quote. Klaus & Sons is here to make your life more comfortable, one service at a time.

Call 909-982-5698 the professional HVAC technicians at Klaus & Sons Plumbing Heating & Air Conditioning in Ontario, CA today for air conditioning service or a free estimate! 

Recent Jobs and Reviews in Ontario, CA

Rated 4.9 out of 5 stars based on 36 customer reviews

Customers say: The reviews exhibit a positive overall sentiment, with recurring positive themes and sentiments. The majority of reviews express satisfaction with the services provided, highlighting professionalism, efficiency, and quality workmanship. Customers appreciate the prompt arrival of technicians, their expertise in diagnosing and resolving issues, and the cleanliness and organization maintained during the service. Positive mentions of the company's reliability, responsiveness, and fair pricing are also evident. Additionally, customers express gratitude for the friendly and helpful nature of the technicians, their willingness to explain the work done, and their overall positive experience. Negative sentiments, if present, are minimal and do not represent a clear, recurring trend. Overall, the reviews suggest a satisfied customer base that values the quality, reliability, and professionalism of Klaus & Sons.

Our Local Reviews by City

Job Locations and Reviews

Heather P.
Heather P. Checked in
(10-12) COD. Spoke with Patty. She is the property manager working for the homeowner, but is in charge of decision making, (909) 496-0488. She said that the tenant has water seeping out from the base of the toilet. Please call Patty with findings and to get approval for any pricing BEFORE performing any work (909) 496-0488! CC is on file, but she may choose to use a different form of payment upon completion of work!
Ontario, CA 91762
Heather P.
Heather P. Checked in
(10-12) COD. Spoke with Patty. She is the property manager working for the homeowner, but is in charge of decision making, (909) 496-0488. She said that the tenant has water seeping out from the base of the toilet. Please call Patty with findings and to get approval for any pricing BEFORE performing any work (909) 496-0488! CC is on file, but she may choose to use a different form of payment upon completion of work!
Ontario, CA 91762
Heather P.
Heather P. Checked in
Per Mario open seperate ticket up.
Ontario, CA 91762
Heather P.
Heather P. Checked in
1 - 5. COD. Spoke to Tina. Please call Gary when on the way!! - (909) 678-0984. AC making weird noise, like it's not running smoothly, found water dripping somewhere in it. They had the ducts replaced about 4 years ago, thinks it might be the outside unit. Please check out. Quoted $158 for diagnostic.
Ontario, CA 91761
Review
Great service and pricing. Service tech was on time and very professional. Customer service was great also. Very happy with everything.
Jeff - Ontario, CA 91764
Heather P.
Heather P. Checked in
RESCHEDULED for TUES 7/29/25 between 1pm-5pm ARRIVAL
Ontario, CA 91764
Heather P.
Heather P. Checked in
Ontario, CA 91762
Heather P.
Heather P. Checked in
8-12. COD. Call when in route. I spoke to Patricia, they want to have their ac unit serviced for the summer, they also have a filter on hand that they want replaced.
Ontario, CA 91762
Heather P.
Heather P. Checked in
revgenniehamilton@yahoo.com
Ontario, CA 91762
Heather P.
Heather P. Checked in
8 - 10 arrival. Mario coming back to do work, half-day
Ontario, CA 91762
Heather P.
Heather P. Checked in
8-12. COD. Text when in route. I spoke to Steve, his ac unit is about 5-7 years old and the unit is not cooling anymore, it went out over the weekend.
Ontario, CA 91762
Heather P.
Heather P. Checked in
Ontario, CA 91762
Review
You guys are the best.
Dennis - Ontario, CA 91762
Heather P.
Heather P. Checked in
Ontario, CA 91762
Heather P.
Heather P. Checked in
8 - 10. NET 30. Per Mario: Cesar approved job, just has to write up estimate then convert to job after.
Ontario, CA 91764
Review
Great service
William - Ontario, CA 91761
Review
Mario came by to check the water pressure on the house and as usual he was awesome. Thank you very much for all your help Mario keep up the great work.
Rochelle - Ontario, CA 91764
Review
Arrived on time, Mario was both informative and helpful.
Jack - Ontario, CA 91762
Review
Repairman always on time and does a quality job
Earl - Ontario, CA 91764
Review
Always use Klaus and Sons when I have plumbing problems.
Tena - Ontario, CA 91762
Review
On time. Courteous. Knowledgeable. Efficient.
Karen - Ontario, CA 91764
Review
Did a good job
Leo - Ontario, CA 91762
Review
On-time, friendly, communicative and professional service- excellent!
Harold - Ontario, CA 91762
Review
Our shower was clogged. We called and were scheduled for the same day. The plumber was courteous, clean and friendly. he did the job and did not leave a mess for us to clean up. Great job. Thank you
Matt - Ontario, CA 91762
Review
great service
Jackie - Ontario, CA 91764
Review
Excellent technician.
Terry - Ontario, CA 91762
Review
Quick professional service, from the person who took the request on phone to the service technician. Great service!
Lupe - Ontario, CA 91762
Review
Got the problem fixed on a reasonable amount of time clean job technician was very knowledgeable and courteous
Jacob - Ontario, CA 91764
Review
Heather; every time we've been serviced by your company Klaus n' Sons ! You've always been the greatest ! We've tried other companies because of scheduling issue on our part ! Not yours! Don't come close to!! We appreciate you guys !! When I call to schedule ; the girls are the best very attentive and knowledgeable to our concerned!! Soo to your well organized company ! Thank yu very much!! Sergio
Sergio - Ontario, CA 91764
Response from Klaus & Sons Plumbing, Heating & Air Conditioning:

We're thrilled to hear that our heating and cooling service exceeded your expectations. Thanks for the kind words!

Review
The service was excellent and serviceman David was awesome.
Guy - Ontario, CA 91761
Response from Klaus & Sons Plumbing, Heating & Air Conditioning:

Thank you so much for taking the time to leave us this amazing review!

Review
When I called Klaus and Sons, Heather answered and was so friendly, courteous and helpful! She listened to my tale of woe about the leak and she scheduled an appointment the next morning. She later checked with me about a minor schedule adjustment with Wes, who did a fantastic job fixing the leak!! I hope I don't have future plumbing issues but when I do, I will call Klaus and hope to speak to Heather!
Rosemarie - Ontario, CA 91762
Review
Great timely service, polite and on time. Thanks
Bryan - Ontario, CA 91764
Review
Justin did an excellent job fixing our burst pipe. He got to our house quickly and got the job done fast. We would definitely recommend this business.
Teresa - Ontario, CA 91762
Review
Wes and his team did a great job!!!
Ken - Ontario, CA 91762
Review
Tech was early assessed the problem and got to work. Was done in no time. Left the work area very clean Andrew was our tech he always does a great job. Glad to have him any time.
Barbara - Ontario, CA 91764
Review
Klaus & Sons very professional puts the customer needs first have used them for years
Linda - Ontario, CA 91761
Review
Mario did a great job on clearing my clogged kitchen sink drain.
Martha Logan - Ontario, CA 91764
Response from Klaus & Sons Plumbing, Heating & Air Conditioning:

We thank you for sharing your positive experience. It made our day.

Review
Great service!!!
Mish - Ontario, CA 91764
Response from Klaus & Sons Plumbing, Heating & Air Conditioning:

We are so grateful for your 5-star review. Thanks for sharing your rating with us and the community.

Review
Fast service! Had my broken pipe fixed within an hour after I called!
Kaydee - Ontario, CA 91762
Review
Recommend to others anytime
Linda - Ontario, CA 91761
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