Klaus & Sons are your local licensed and insured (CSLB #320990) family-owned 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.
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.
Klaus & Sons have been serving Upland and the surrounding communities for over four decades. We pride ourselves on providing every customer an excellent experience.
Commercial and Residential Service
Free HVAC Estimates
Free Air-Conditioning, Plumbing & Heating Estimates
Utility Bills Savings
Hero Program Financing
Energy Upgrade California Rebates
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
Water Heaters • Tankless Water Heaters
Tub and Toilet Repairs/Replacements • Toilet Tank Repair and Installation
Sink and Faucet Repairs/Replacements
Hot Water Dispenser
Whole House Re-Piping •
Install Digital Thermostat
Wi-Fi Thermostat Install
Split System Repair & Replace
Heating and Cooling Package Units
Rooftop Heating and Cooling System Installation
Install & Relocate Air Conditioner
High-Efficiency Heating & Cooling Systems
Filters • Indoor Air Quality Systems
Indoor Air Quality Control
Airflow Ducts • Ductwork Improvement
Central Air-Conditioning Units
HVAC System Tune-ups
Troubleshooting and Diagnosis
Heating Repair & Troubleshooting
Central Heating Repair & Installation
Gas Furnace Repair & Installation
Troubleshooting and Diagnosis
Condenser Repair & Replacement
Heat Pump Repair & Replacement
Indoor Air Quality Control & Air Filtration Systems
Gas Leak Detection & Repairs
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.
FINANCE FOR AS LOW AS $116 A MONTH** with the purchase of qualifying equipment!
It’s beautifully designed to keep you comfortable and help save energy. Turns itself down when you’re away.
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.
A truly good plumber, excellentUpland
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!Pomona
We are very pleased with the work and all the workers!Ontario
As a follow-up to my earlier review, I want to say again how pleased I am with the quality of work and how great it is to work with Klaus and Sons. Junior returned with the air blower parts more quickly than expected. His repairs did the job and then he went above and beyond by checking temperatures at various points. He determined it wasn't as effective as it should, check the air conditioning unit and showed it was low. The whole time he was doing the maintenance he carefully explained everything, showing the readings and what they meant. Definitely calling Klaus and Sons when we are ready to upgrade and would be very happy to see Junior there again. Thank you.Technician: Junior
Knowledgeable and efficient while trying to minimize any mess. Would call again.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!Technician: Fred
Tiffany was great! Charlie was exceptionally good, if I had a business I would want Charlie working for me!Rancho Cucamonga
Have had Gene out many times the past 3-4 years. Very knowledgeable. Stays on the job until he's satisfied. He helped me out of a heating problem caused by another source. Recommend him highly.Technician: Gene
Our technician, Tyler, was friendly and knowledgeable. Service was clean, fast and the office was helpful and kind.Rancho Cucamonga
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.Chino Hills
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!Technician: Fred
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.Upland
We referred our neighbors. Andrew was very informative and nice.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.Upland
Fred was very dedicated to completing the job properly.Upland
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.Mt. Baldy
"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 GoodTechnician: Fred
Our technician was thorough and courteous and answered all of our questions. We are repeat customers.Pomona
Very efficient, friendly service. Thank you!Upland
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 CucamongaTechnician: Dan
These guys are a class act. Not only have they helped me fix any number of plumbing issues around the house but I also wouldn't be anywhere near as cool as I am thanks to to their air service. I'm a drywall contractor too and have done a lot of business with these guys over the years and know them to always look out for their customers first. It's a family business run like it will be passed through many more generations. Everyone there is so competent and if you meet Klaus you'll get an idea how this place stayed in business for 40 years. You can't go anywhere without seeing their trucks! Old school business values, family business and top notch craftsmanship means you can send these folks to your moms house without worrying about them trying to get rich on one job. Like I said in the beginning, Klaus and Sons, Danny, Jesse , grandson Chris and all their other top notch journeyman are class acts!
Andrew was polite, knowledgeable and we received excellent customer service.Upland
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!Technician - Fred
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.Los Angeles
Wes asked good questions about our need for a replacement toilet and arrived at the time he promised. The work was well done, great attention to detail and the area was left spotless. In short, Wes maintained the high standards I've come to expect from Klaus and Sons.Wes Vaughn
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.Tech: Gene
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.Upland
I cannot believe how honest you guys are! Marino installed a new water heater, he was so helpful. He, Wes and Gene are awesome!Glendora
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.Upland
Our technician, Wes, was a happy hard-working, thinking tech. Clean, fast. We are repeat customers.Upland
Very good service! We were well pleased. Tifanny was very helpful.Upland
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.Technician: Sal
Tyler could not have been nicer or helpful. Very friendly and efficient. Good job.....Terry MorrisonTech Tyler
Klaus & Sons continues to take excellent care of all our plumbing needs, as they have for decades.Alta Loma
This job looked huge in my eyes; however, the outcome was SEAMLESS! THANK YOU!Los Angeles
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.Technician: Fred
Wes was very polite, professional and clean. I would call Klaus & Sons again.Rancho Cucamonga
As usual, excellent and friendly service.Upland
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!!!!
Service was very good, would call again, office was helpful and kind, clean. Very professional service.Technician-Fred
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!Upland
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.
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!
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.
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.
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.
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.