Klaus & Sons Plumbing
Heating & Air Conditioning

(909) 982-5698

Klaus & Sons are your local licensed and insured (CSLB #320990) family-owned Upland plumbing, heating and air-conditioning experts. We provide local residential and commercial HVAC (Heating, Ventilation, and Air-Conditioning) and plumbing services 24 hours a day by an expert, trained technicians.

 Knowledgeable, Friendly Office Staff

Along with our experienced technical staff, we have a courteous and professional office that can answer questions and help you with all your service, maintenance and installation needs.

We repair all brands, makes and models of HVAC equipment.

Upland Air Conditioning
Heating & Plumbing Since 1973

Klaus & Sons has been serving Upland and the surrounding communities for over four decades. We pride ourselves on providing every customer an excellent experience.


Special Offers

Free Nest Thermostat

lennox promotion

Winter Promotions

The perfect system should adapt to your life to deliver the ultimate in energy savings and precision temperature control. We agree. And that’s why we’re proud to be a leading provider of innovative, home heating and cooling systems. Our high-efficiency, Lennox® residential air conditioners, furnaces and HVAC systems help maximize comfort while reducing utility costs. Plus, our Lennox air filters, humidifiers, and dehumidifiers help create healthier and cleaner indoor environments. Call now and save with REBATES UP TO $1,500* OR UP TO 72 MONTHS INTEREST-FREE FINANCING on qualifying equipment.


Your 24-Hour Emergency Plumber & HVAC Service Experts

Commercial and Residential Service
Free HVAC Estimates
Free Air-Conditioning, Plumbing & Heating Estimates
Utility Bills Savings
Hero Program Financing
Energy Upgrade California Rebates
Energy-Efficient Upgrades


 An Upland Plumber You Can Count On!

24 Hour Emergency Plumbing Services
Help You Save Water & Lower Utility Bills
Plumbing Repairs – Large or Small
 Service and Repair Gas Water Heaters •  Re-Light Water Heater Pilot Light
Backflow Prevention Experts
Leaking Pipe Detection
Pipe Camera Inspections •  Sewer Inspection Camera
Pressure Regulators

No Hot Water? No Water Pressure?
Call (909) 982-5698

Water Heaters •  Tankless Water Heaters
Tub and Toilet Repairs/Replacements • Toilet Tank Repair and Installation
Sink and Faucet Repairs/Replacements
Hot Water Dispenser
Drain Cleaning
Outdoor Plumbing
Whole House Re-Piping • 


Upland Air Conditioning Installation & Repair Experts

Attic Insulation
Install Digital Thermostat
Wi-Fi Thermostat Install
Humidifier Installation
Split System Repair & Replace
Heating and Cooling Package Units
Rooftop Heating and Cooling System Installation
Install & Relocate Air Conditioner
HVAC Replacements

No Cool Air? No Hot Air? Call Us at (909) 982-5698

High-Efficiency Heating & Cooling Systems
Filters • Indoor Air Quality Systems
Refrigerant Leaks
Indoor Air Quality Control
Airflow Ducts •  Ductwork Improvement
Central Air-Conditioning Units
HVAC System Tune-ups
Fan Motors
Troubleshooting and Diagnosis


Install a New Heater or Repair an Existing Unit

Heating Repair & Troubleshooting
Central Heating Repair & Installation
Filter Replacement
Gas Furnace Repair & Installation
Fan Motors
Troubleshooting and Diagnosis
Airflow Ducts
Condenser Repair & Replacement
Heat Pump Repair & Replacement
Indoor Air Quality Control & Air Filtration Systems
Gas Leak Detection & Repairs


Solutions To All Your Plumbing, Heating And Air-Conditioning Needs Since 1973

Klaus & Sons is a full-service HVAC company. We can help you solve any air-conditioning, heating or ventilation problem. Our technicians have extensive experience, and our customer loyalty and satisfaction reflect the quality of our work and commitment to solving all your HVAC repair and installation issues.

Licensed California Contractor

Same Day or Next Day Service

Repair All Makes and Models

Emergency Service Available

Upland Owned & Operated for Over 40 Years

No Hidden Charges or Fees


Customer Reviews

Klaus & Sons is proud to share numerous reviews from satisfied customers. Check out the quotes below or go to our Review Us page and listen to what our customers have to say about our service. We welcome feedback and hope you will review our services.

  • Our technician, Tyler, was friendly and knowledgeable. Service was clean, fast and the office was helpful and kind.

    Bruce H. Rancho Cucamonga
  • Our technician was thorough and courteous and answered all of our questions. We are repeat customers.

    Joanne H. Pomona
  • I cannot believe how honest you guys are! Marino installed a new water heater, he was so helpful. He, Wes and Gene are awesome!

    Kristin F. Glendora
  • Fred was professional and courteous. Thank you for traveling to Mt. Baldy, it is appreciated. The service was very good, fast and the office staff was helpful and kind.

    Elna H. Mt. Baldy
  • Klaus & Sons continues to take excellent care of all our plumbing needs, as they have for decades.

    Betty P. Alta Loma
  • Andrew was polite,  knowledgeable and we received excellent customer service.

    Donna D. Upland
  • Very good service! We were well pleased. Tifanny was very helpful.

    Fred G. Upland
  • Our technician, Wes, was a happy hard-working, thinking tech. Clean, fast. We are repeat customers.

    Allen F. Upland
  • We referred our neighbors. Andrew was very informative and nice.

    Sherry H. Upland
  • Our technician was Fred. We were very impressed with the service, especially with Fred, who is very professional. You should be very proud of him he is a great asset to your company.

    Ann P. Upland
  • Wes was very polite, professional and clean. I would call Klaus & Sons again.

    Janice S. Rancho Cucamonga
  • Fred was very dedicated to completing the job properly.

    Darryl B. Upland
  • As usual, excellent and friendly service.

    Roger D. Upland
  • Our technician, Charlie was at our home for a plumbing and repair issues Charlie did a great job and always kept me aware of time, etc.

    Dan D. Upland
  • We've been in our home for over 50 years and have used Klaus & Sons many times. They are reliable, fast and that kept this old house in tip top shape. I definitely recommend them to my neighbors and friends.

    Rosemarie M. Upland
  • Very efficient, friendly service. Thank you!

    Donna M. Upland
  • We are very pleased with the work and all the workers!

    Dan L. Ontario
  • A truly good plumber, excellent

    Harvey S. Upland
  • Dear John and the great crew at Klaus & Sons, thank you so much for a great job. Well done. I appreciate you being on time, neat, polite and friendly-what a hard-working crew!

    Tom R. Upland
  • To the whole team at Klaus & Sons, THANK YOU I am sorry I did not have the opportunity to meet any of you when you came and did our installation, but my wife could not contain her excitement with what a wonderful job you all did at our home. Great work, you are very much appreciated.

    David K. Los Angeles
  • This job looked huge in my eyes; however, the outcome was SEAMLESS! THANK YOU!

    Inez S. Los Angeles
  • Just a note to express my appreciation for the exceptional service I received from Gene. He was very thorough but what impressed me the most is that he took the time to explain the details of the service process and what each part of the equipment does and what I need to do to extend the life of my AC/heating units. He never appeared rushed. It was a real education watching him perform the service on my two units. Without question, Klaus & Sons will forever maintain my AC/heating units, special thanks to Gene!  

    Bob W. Pomona
  • Thank  you so much all of your help. Your men are always on time polite and kind. For 25 years you've never let me down.

    Carol O. Upland
  • Tiffany was great! Charlie was exceptionally good, if I had a business I would want Charlie working for me!

    Sam R. Rancho Cucamonga
  • Fantastic people to have your work done. Fred and Andrew were great, along with the rest of the crew!!!. They were hard workers, polite and they cleaned up after themselves. Fred even had to come back to the house after working 8 hrs. for a minor glitch....he is wonderful!!! An awesome company to deal with!!!! Thank you all so very, very much, we all appreciate what you have done for us and will Highly recommend you to anyone that needs your kind of service!!!!

    Very Good Service
  • Service was very good, would call again, office was helpful and kind, clean. Very professional service.    

    Louis G. Technician-Fred
  • Thank you Klaus and Sons. I want to say thanks to Fred as well. He came out to my house on short notice, helped me with a plumbing issue in my sink and we polite, trustworthy, and hardworking. Thank you very much!

    Eric R. Technician - Fred
  • Fred was on time, friendly, and professional. He thoroughly checked everything out and explained his assessment clearly and completely. Fred obtained the parts needed and finished the job the same day. I've had work done by Klaus and Sons and I am completely satisfied again. The service you provide is excellent.

    Lynda Technician: Fred
  • Got a quote from John to replace our AC system right after our scheduled inspection appointment. He is very knowledgeable and steered us to the right equipment based on our use, without overspending on the "bells and whistles", and he is not pressuring us to make the decision. After we decided to go with Klaus & Sons, John was able to send a crew for the installation within 2 days, and he sure picked a good crew to work on our unit. Kevin, Tom and their assistant showed up at our house as scheduled and did a wonderful job on the installation. They took care in protecting the work areas, did a professional  installation, started the unit and adjusted it to run perfectly. All the rooms are now cooled down evenly both upstairs and downstairs. These guys did a great job that we even recommend them to a few friends and co-workers.

    Roger M. Chino Hills
  • Knowledgeable and efficient while trying to minimize any mess. Would call again.

    Robert Z. Technician: Fred
  • I called on a Saturday afternoon for an emergency water main repair. The receptionist was very courteous and polite and I received a call from Fred within 15 minutes. Fred was able to assess the situation and made a repair on the spot (I had already dug up the main). Once repaired, he made sure the fittings had cured before turning the water back on. Overall, excellent service!!! Couldn't ask for better! Thanks!

    Matthew D. Technician: Fred
  • "Fred did an excellent job in an efficient manner. Thank You." Service = Very Good Would You Call Us Again? = Yes Office Help = Helpful/Kind Job Left Clean? = Yes, Clean Overall Satisfaction = Very Good

    Jacquie R Technician: Fred
  • Tyler could not have been nicer or helpful. Very friendly and efficient. Good job.....Terry Morrison

    Terry M. Tech Tyler
  • We have Lennox HVAC, and had disappointing experiences with three other Lennox dealers. Gene is by far the best technician we've worked with--very knowledgeable and helpful, and glad to explain ways we can get the best service out of the equipment. He sets a high standard of excellence.

    Jack C. Tech: Gene
  • We had a bathroom remodel done on our old home. Dan and his team are 5 stars, all the way. They are professionals that are happy people and proud of their work. You can't find workers like them anymore. I want to thank Klaus & Sons for the great remodel and it was totally done in only 3 weeks. Their prices are fair and the work is perfect! Thanks Again. Nancy W., Rancho Cucamonga

    Nancy W. Technician: Dan
  • My water heater began leaking Sunday morning. I called a few places and received several outrageous quotes. I called Klaus & Sons and Sal was there within 45 minutes. He completed the job in a timely, professional manner and I was given a very fair price especially for a Sunday emergency. Thank you so much for a job well done!! Will definitely use Klaus & Sons for all my future plumbing needs.

    Joan F. Technician: Sal
  • A big thank you to Fred for fixing the cracked pipe in the wall/foundation off the main kitchen drain pipe the day after Christmas. It was a very long day, but he stuck with it and finished the job that day which I was most appreciative of. Price was fair, Fred was neat, professional and willing to explain things as he worked, Thanks again Fred!

    Sandy Technician: Fred

Your Upland Plumber

Our team of professional plumbers is ready to help you with all plumbing repair and installation services. As a local plumbing company, we can get to your home promptly and deliver our affordable plumbing services.

 The Clean
Plumbing Team

 Licensed and insured, Upland homeowners rely on Klaus & Sons’ fast and dependable service. Our plumbers work every job as cleanly as possible so you don’t have a mess. We handle all types of drain cleaning and plumbing jobs, large or small. Count on our Upland plumbing team to get the job done right the first time!

Heating Repair & Installation

Our focus is heating your home safely and as efficiently as possible. Routine maintenance and and energy efficient heating units can help lower your energy bills significantly. We are your heating and furnace specialists in Western San Bernardino County and Eastern Los Angeles County.

 Servicing All Makes & Models
of HVAC Equipment

We can service most makes and models and are a Lennox factory authorized dealer. Lennox is a leader in efficiency and reliability, with outstanding warranties. They offer great financing, so along with our free estimate you’ll know exactly your home requires with no hidden fees or surprises.

Upland Air-Conditioning
Installation & Repair

Our factory-trained technicians provide air-conditioning installations, repairs and testing for your home or business. We can examine your unit to help determine when an upgrade is necessary. During the summer months quality air-conditioning is a necessity. The wrong unit or a faulty installation can lead to aggravating maintenance problems and poor cooling air circulation.

 Efficient & Way Cool

We are a Lennox HVAC dealer, and our factory trained technicians will determine the best system for your overall comfort. We also can tackle repairs on most models of air-conditioners so you can rest comfortably knowing your AC system is being maintained and repaired properly. We are your Upland air conditioning specialists.

About Klaus & Sons

More reasons to call Klaus & Sons…


Klaus & Sons has highly-trained and product-knowledgeable technicians to make sure every service call is done right the first time. We also pride ourselves on our friendly and professional customer service staff.


We respect our customers’ time and always arrive to our residential and commercial appointments on time.


Our technicians undergo ongoing education to ensure that the latest industry practices and standards are strictly adhered to. We offer state-of-the-art techniques and products that are designed to last.


Klaus & Sons has a 24-hour-a-day answering service, making after-hours contact simple. We understand that many plumbing, heating and air-conditioning issues don’t happen during regular business hours and we are here for every emergency call. Call us at (909) 982-5698 anytime you need a plumber, heating repair, air-conditioning repair or any HAVC maintenance or installation.


We respect all working environments and will leave your home or business clean. Our professional technicians work as cleanly and efficiently as possible to make sure that you can get life back to normal quickly.


Klaus & Sons offers a 100% guarantee, which means our job is not finished until you are completely satisfied. You will have peace of mind knowing that you’ve selected a company that is committed to getting the job done right.

Air-conditioning installation and repair, heating repair and installation and all plumbing services are part of the Klaus & Sons satisfaction guarantee.

 Request a service by an expert technician…



Alta Loma • Azusa • Charter Oak • Chino • Chino Hills • Claremont • Diamond Bar • Fontana • Glendora • La Verne • Montclair • Ontario • Pomona • Rancho Cucamonga • San Dimas • Upland • Walnut