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 recurring themes of satisfaction, professionalism, and reliability. Customers praise the promptness, friendliness, and expertise of the technicians, as well as the fair pricing and excellent customer service. Positive reviews also mention the efficiency, helpfulness, and solutions provided by the technicians. The Klaus & Sons team is consistently commended for their prompt and thorough service, leaving the work area clean and resolving issues effectively. Customers express gratitude for the company's reliability, responsiveness, and the quality of their work. Additionally, the technicians are recognized for their knowledge, patience, and ability to explain complex issues in a clear and understandable manner. Overall, the reviews convey a sense of trust, satisfaction, and confidence in Klaus & Sons as a reliable and trustworthy plumbing and HVAC service provider.
Our Local Reviews by City
- Azusa, CA (1)
- Chino, CA (13)
- Chino Hills, CA (5)
- Claremont, CA (88)
- Covina, CA (4)
- Diamond Bar, CA (4)
- Fontana, CA (9)
- Glendora, CA (4)
- La Verne, CA (8)
- Monrovia, CA (1)
- Montclair, CA (10)
- Ontario, CA (37)
- Pomona, CA (16)
- Rancho Cucamonga, CA (62)
- San Dimas, CA (8)
- South Pasadena, CA (1)
- Upland, CA (155)
Job Locations and Reviews

Within half an hour. COD. Call when in route. I spoke to Tim, their compressor to their hvac unit went out and is no longer working.

8 -12. COD. Spoke to Nadine. CONFIRMED APPOINTMENT. AC isn’t cooling – noticed it yesterday, not blowing cold air. Doesn't know how old it is. Quoted $158 for diagnostic.


10-12. COD. Call 805-284-4945 Jim green Son when in route. The faucet in the kitchen needs to be fixed.

2-4. Time requested. COD. Call Nurse Alex 909-662-6529 when in route. I spoke to Alex, the garbage disposal is backed up and not draining, garbage disposal may need to be replaced.
Great service

8-12. COD. Call when in route. I spoke to Chris, the blower motor is going out on their unit and needs to be fixed.

8-12. COD. Call when in route. I spoke to Chris, the blower motor is going out on their unit and needs to be fixed.


10-12. COD. Call when in route. I spoke to Vivian, they want their heater and ac unit to be serviced. They do NOT want the service contract. Will be $257 for the maintenance.

Within the hour. Spoke to Frank. COD. AC went out over the weekend. Blowing air but fan outside not working at all. Not doing anything – blowing hot air. Quoted $158 for diagnostic. Wants you to bring a 16-inch filter as well in case it needs to be changed out. We installed this unit in 2007.

Within the next 30. COD. Spoke to Mary Lou. Mario gave ballpark quote on phone to replace bobber for toilet. Toilet bottom when opened up - the bobber spits out water, needs to be replaced. Happened over the weekend.

Within the next 30. COD. Spoke to Mary Lou. Mario gave ballpark quote on phone to replace bobber for toilet. Toilet bottom when opened up - the bobber spits out water, needs to be replaced. Happened over the weekend.
Great service and pricing. Service tech was on time and very professional. Customer service was great also. Very happy with everything.
You guys are the best.
Great service
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.
Arrived on time, Mario was both informative and helpful.
Repairman always on time and does a quality job
Always use Klaus and Sons when I have plumbing problems.
On time. Courteous. Knowledgeable. Efficient.
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!