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
Customers say: The reviews exhibit a positive sentiment, with many customers expressing satisfaction with the services provided. Positive reviews frequently mention aspects such as professionalism, punctuality, expertise, and excellent customer service. Customers also appreciate the quality of the work, the efficiency of the repairs, and the friendly and respectful attitude of the technicians. Additionally, there are mentions of reliability, trustworthiness, and the ability to handle various plumbing issues. Negative reviews are present but are less frequent and tend to focus on specific issues or experiences. However, the overall tone remains positive, with many customers expressing gratitude and recommending the services to others.
Our Local Reviews by City
- Azusa, CA (1)
- Chino, CA (12)
- Chino Hills, CA (5)
- Claremont, CA (83)
- Covina, CA (4)
- Diamond Bar, CA (4)
- Fontana, CA (8)
- Glendora, CA (4)
- La Verne, CA (8)
- Monrovia, CA (1)
- Montclair, CA (9)
- Ontario, CA (33)
- Pomona, CA (15)
- Rancho Cucamonga, CA (59)
- San Dimas, CA (8)
- South Pasadena, CA (1)
- Upland, CA (143)
Job Locations and Reviews

10 - 12. NET30. Spoke to Cesar. 2 plumbing issues need to be addressed: 1) staff restroom sink is leaking 2) inside classroom water fountain is leaking. Both slow leaks. Contact Cesar at - (323) 236-5453 and send over estimate to email on file for approval. They require estimates before performing work so please provide estimate first and have them approve it before preforming any work!

2 plumbing issues need to be addressed: 1) staff restroom sink is leaking 2) inside classroom water fountain is leaking. Both slow leaks. They require estimates before performing work so please provide estimate first and have them approve it before performing any work.

Call when in route, ring the doorbell for her daughter to open the door. Problem with Regulator
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.

Mario only. They had a water regulator put in by Mario

Arrived on time, Mario was both informative and helpful.

Main line has small little hole leaking water, his brother located the hole, took dirt up and everything, they just need someone to repair the leak. Please provide pricing for this before performing work.

Main line has small little hole leaking water, his brother located the hole, took dirt up and everything, they just need someone to repair the leak. Please provide pricing for this before performing work.

Main line has small little hole leaking water, his brother located the hole, took dirt up and everything, they just need someone to repair the leak. Please provide pricing for this before performing work.

There is a leak in the bathtub of this duplex property, but some of the fixtures are accessible through the attached unit, on Plaza Serena, which is currently vacant, but they are remodeling. Please get approval on any pricing before performing work.
Repairman always on time and does a quality job

I spoke to Earl, they need their unit to be serviced for the summer.

She was referred by a friend. AC not working. Been out of country, came back and turned it on and it's not coming on. Said it's a Goodman unit from about 2007 or 2008.

New dishwasher valve is frozen, bath faucet has a drip, and stove gas line needs to be moved. Please provide pricing for these 3 things before performing any work.
Always use Klaus and Sons when I have plumbing problems.

2-4. COD. Call when in route. I spoke to clogged line between kitchen and laundry room line as the drains go down really really slow. She also needs help replacing the flapper on their toto toilet.

(8-12) Spoke with Judy. *NEW MEMBER* They have ALREADY PAID *$235* for their 1st year's membership. David, please make sure you service BOTH AC & Furnace components. They will now be gold members. Please remember they get 10% off any repairs, filters, or refrigerant due to being a member of the service agreement plan!

10-12. COD. Call when in route. I spoke to Tamsin, the kitchen sink is backed up. It still drains slowly and they think it is backed up from the washer line.

12 - 2. COD. Spoke to Charles. Problem with toilet, thinks it might need new insides, not flushing correctly, said it's a long story lol. Please check out and provide pricing before performing any work!!

Per James all day job Thursday and Friday.
On time. Courteous. Knowledgeable. Efficient.

9098221500 please change phone number to this

8-12. COD. Requested Fernando. Call when in route. I spoke to Karen, they want to have their ac unit serviced before the summer.
Did a good job
On-time, friendly, communicative and professional service- excellent!
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
great service
Excellent technician.
Quick professional service, from the person who took the request on phone to the service technician. Great service!
Got the problem fixed on a reasonable amount of time clean job technician was very knowledgeable and courteous
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
We're thrilled to hear that our heating and cooling service exceeded your expectations. Thanks for the kind words!
The service was excellent and serviceman David was awesome.
Thank you so much for taking the time to leave us this amazing 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!
Great timely service, polite and on time. Thanks
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.
Wes and his team did a great job!!!
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.
Klaus & Sons very professional puts the customer needs first have used them for years
Fast service! Had my broken pipe fixed within an hour after I called!
Recommend to others anytime
On time. Quick installation Have trusted Klaus & Sons for over 40 years.
Thank you so much for your 5-star review! We will share this with the team to let them know to keep up the amazing work!
They are always efficient, has great customer service, and I don't feel ripped off
The Tech was good fixed the problem. Price was high but that is with all services these days.