Promax Service Group is an HVAC service provider located in Santa Clara serving the South Bay area. With a 5-star rating based on 78 customer reviews, the company specializes in heating, ventilation, and air conditioning services. For more information, visit promax-service.com.
I had a gas water heater in my garage, and with the City of San Jose's ban on gas water heaters starting in 2027, I wanted to get ahead of the curve and replace my gas water heater with a new electric heat pump water heater (HPWH). San Jose Clean Energy was also providing a $3000 HPWH rebate, plus another $700 HPWH rebate from Golden State Rebates. I contacted several plumbers to get quotes for the HPWH install. When I called Promax to schedule an estimator visit, Albert dropped by the same day. Promax impressed me with their attention to detail. For example, when checking my subpanel in the garage, Albert asked me what my main panel size is (200A). But out of all the companies, Albert was the only one that visually checked my main breaker is actually 200A. Albert was also the only one that performed a load calculation to make sure my subpanel was not overloaded. Some of the other estimators didn't mention it. I expressed all of my needs to Albert, including ordering a specific Rinnai HPWH unit to qualify for the Golden State Rebate. I received a written estimate from Albert the next day, and he also called me to follow up if I had any questions. Once again I was impressed with the amount of detail and transparent on the estimate. For example, it included a through breakdown of all the materials required, along with all included labor services. Many plumbers simply say "install water heater" without any details or breakdowns. The estimate also separately listed and priced the city permit cost. Again, many companies don't separately list the permit and refuse to provide a cost. This is a huge red flag because they're secretly upcharging the customer on the permit cost. Promax never upcharges. They show the exact permit cost, and in case the actual cost is lower once the permit is pulled, they will refund the difference back to the customer. Impressive! After a few back and forth with Albert to make minor modifications to the estimate, I signed the estimate. Since I wanted a specific Rinnai HPWH, Promax had to custom order the unit. We scheduled the install once the unit arrived and the permit was pulled. In the meantime, I got HOA approval for the install as HPWHs need a condensate drain to the exterior of home. On the day of the install, Promax plumber and owner Max and his helper arrived on time. They disassembled and removed the existing gas water heater and installed the new Rinnai HPWH unit. They parallelized the work so one person did the plumbing and the other did the electrical. The installation was done professionally and I think the outcome looks great! It took about 6 hours from start to finish, as there was a delay in the middle due to missing part which they had to go out and retrieve. After the install, I provided Max a payment check before he left. The next day Promax called me to schedule the city inspection, which was scheduled a little over 1 month away. Max arrived for the inspection and the inspection passed with no issues. Unfortunately, the Rinnai HPWH unit's fan was really loud, I could hear it across two floors at home. It was bothering me a lot. I called Albert to come over to take a look and we called Rinnai customer service together. After a live video call, Rinnai agreed that it wasn't supposed to sound that loud and sent over a replacement fan unit under warranty. Once the part arrived, Max came back to swap the fan unit. While the fan noise can still be heard, it's improved. I can't blame Promax for this because I specifically requested this Rinnai HPWH unit. They typically install Bradford White HPWH units. Overall, I had a great experience with Promax. The communication from Albert and the team is good, and the installation was done professionally. They also helped me work through the Rinnai warranty claim, as well as the Golden State Rebate. Special shoutout to Anna and Nate! They answer the Promax main office phone line. They're both friendly and always does a great job at relaying my questions to the correct people inside the Promax team, and give me a callback with updates.
I usually don't like to work with structured companies when dealing with my home repairs. But Pro Max is that rare company that is actually there to support the customer, rather than put up a wall between me and the people working on my home. I felt I had the whole team working on my furnace. My furnace was not an easy fix. Response times were very quick.. They were more available than I was.. They were extremely communicative with emails and texts and follow up; always providing a phone number and a name, and always courteous and friendly. I had 5 or 6 phone calls back and forth with Nick one morning with questions and explanations and decisions. And they were truly professional in their craft. When the first part that they replaced did not fix the problem they applied what I had already paid to the cost of the next part and repairs. (Yes, I checked the price from other sources) These are people who really stand behind their work. Thank you, Max, Nick, Anna, and Kostas!
They installed Mitsubishi HVAC mini-split system at my home with 4-indoor unit, removed existing gas furnace and patched the wall. They did a wonderful job. They take their work very seriously, paying attention to every minute detail, always on time, keeping everything neat and clean. Also handled the rebate process on timely fashion. I highly recommend them for the quality of service they provide for the price.
The Promax team gave me the best estimate for my Navien HPWH. Not only that the team is very good at communicating to ensure that my questions are asked, confirming appointments, and helping with my rebate applications. The team is friendly and did a great job with the installation. They came back to help me with the water heater menu and trying to setup the rebate. I highly recommend Promax for providing excellent service.
From the initial consultation to the final follow-up, Promax Service Group was wonderful to work with. Albert came out to assess our home and walked us through several options with clear, transparent quotes. What really stood out was that he took the time to perform a proper Manual J load calculation and based his recommendations on the results rather than simply recommending larger equipment. We never felt pressured, and he was always happy to answer our many questions. We ultimately decided to move forward with a complete HVAC upgrade throughout the house. The pricing was very reasonable and, best of all, there were absolutely no surprises during the installation; no unexpected fees or "while we're here" add-ons. They also walked us through the rebate process, making what could have been a confusing step incredibly easy. Max T and his crew showed up on time every day, stayed right on schedule, and even finished a day earlier than promised. The entire project was seamless from start to finish, including the post-installation follow-up. Very rare, especially when you're working with contractors. Thank you to Albert, Max T, and the entire Promax team for the outstanding work. Our home has never been more comfortable!