Reliable Plumber & HVAC Contractor In Upland, CA

I've always used Klaus and Sons for all my HVAC and plumbing problems. I find their price to be reasonable, service technicians professional and the workmanship always excellent. I find comfort in knowing I can always count on Klaus and Sons in time of need.

I was our first time with Jake we always had Chris in the past. Jake not disappoint!!! He took pictures of everything that needed to be done and showed the pictures and discussed everything with my wife so she knew exactly what he was doing and why. Very impressive!!!

Great experience with AC tune up service. I’ve used K&S for so many other services and this one was just as great. Great communication and no high pressure upsells. Just quality, honest work.

Needed a new A/C & they were able to deliver & install in less than a week.

was quick

Great Job!

On time, quick, clean

Mario is an expert in his field. Professional and trustworthy. Thank you for your service.

Great job done, fast repair, good price

Good work, good advice. The plumber, Amen, went out of his way to get me the kitchen faucet I liked!

When the recent early May heatwave settled in, we noticed our central A/C system did not kick in. We called Klaus & Sons. Spoke with Julio on the phone, he set up a service call with David, the technician on the same day. David arrived mid-afternoon. I received a confirmation email of the appointment, as well as a text message from David when he was 10 minutes away. David arrived on time, dressed professionally and ready to troubleshoot our system. David located the source of the problem, ( a loose low voltage communication connection on a circuit board located at the compressor). David proceeded to remedy the problem, cleaned the compressor coils, and tested the system. Fast, efficient, and courteous service. Thank you Klaus & Sons

Klaus & Sons are amazing, all the way from the first call to the technicians that come out. We have use them for many years

James was great. Gave us our options to choose from for water heater. No pressure chose to get a new water heater. He went and picked up and installed all within a few hours. He represented Klaus & Sons very well.

They are a wonderful very responsive and professional company. I have used them for years

Dependable, trustworthy, professional, reliable and friendly.

Fernando and Evan arrived on time. They were professional, friendly and respectful. They explained what they planned to do. The work was completed quickly and they cleaned up thoroughly. I was exceptionally pleased with the entire project and would not hesitate to recommend them and Klaus highly.

Excellent Service!

I can't say enough about Klaus & Sons. I had a situation that required me to shut down both of my restrooms. Not good to be in. Klaus & Sons came to our recuse very quickly and resolved my problem right away. I can't Thank them enough. I would highly recommend them to anyone, they are very professional and caring.

We had a challenging job for Klaus’ plumbers. We needed two bathroom faucets replaced (vintage 1975 on tile countertops). The sinks were so old that the plunger holes were too small and the sinks needed replacing. The guys found new replacements and carefully installed them. We called them back to cleanup more old grout and they did it right away. We are very pleased with the whole experience.

All staff at this company were polite, prompt, and professional, providing quality work and service!

Always professional & great service

Always the very best service! We’ve been customers for 30+ years now and you are the most professional trade we have ever had working on a home!

Thanks for coming so quickly!!! I was amazed and very pleased

Great service

Quick service to install new toilet and angle valve. Courteous and friendly plumber showed up and even hauled away old pot.

Excellent A/C service from your technician, Raul.

Wes did an excellent job and very patient as we tried to decide on which items we wanted.