Heat Pump Air Handler and Furnace Repair in South San Francisco
This furnace repair in South San Francisco started the way a lot of our winter calls do: a homeowner booked a furnace service call, and our technician went out to find out what was going on with the heating system. The house has a heat pump setup with an indoor air handler and an outdoor unit, and the fix came down to two parts rather than a whole new system.
In the end we replaced the 240-volt transformer in the heat pump air handler and the furnace ignition control. The visit took about two hours on site, including testing before and after the work.
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What we found inside the air handler
The first stop was the indoor air handler. With the front panels off you can see everything that makes the system run: the blower, the low-voltage wiring and the transformer that steps line voltage down for the controls. When a transformer fails, the controls lose power and the system cannot do its job, even if the bigger components are perfectly fine.
Our technician worked through the wiring with a clamp meter, confirmed where the problem was, and replaced the 240-volt transformer. It is a small part, but the rest of the system depends on it.
Replacing the furnace ignition control
The second part on this job was the furnace ignition control. This is the component that manages the ignition sequence when the system calls for heat. When it stops working properly, the furnace side of the system cannot start a heating cycle the way it should. We swapped in a new ignition control and then ran the system to make sure it behaved normally.
We also checked the outdoor side. In the photo below the outdoor unit has its service panel off while we looked at the controls and wiring there, so we could be confident the whole system was working together, not just the part we had replaced.
Why we repair instead of replace when it makes sense
Not every heating problem means new equipment. On this job the air handler and outdoor unit were in working condition, and the trouble was in two specific control parts. Replacing those parts got the system back in service without the cost and disruption of a full replacement.
- Indoor air handler: 240-volt transformer replaced
- Furnace: ignition control replaced
- System tested on both the indoor and outdoor side before we left
If your heat has stopped working or the system is acting strangely, it is worth having someone test it properly before deciding anything. You can read more about how we handle furnace repair on the Peninsula, and we are happy to come take a look at homes in South San Francisco and nearby cities.
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Reviews
Trusted by your neighbors
“Honest and meticulous. They quoted me a competitive price for work that they expected to complete within a few days. The time to finish the job increased, but the price did not. It's clear that they are *very* careful and detail-oriented during installation. Fedor and the rest of the team also make everything before the work very easy; figuring out what you want, advising what to do, and communicating about scheduling/logistics. Very happy overall, would recommend them without hesitation. My wife and I have already used them twice: adding a central heat pump and later augmenting it, in select rooms, with mini splits.”
“Nur HVAC is the company you 10000% want to use for your HVAC! I had a ducted heat pump installed and got 4 quotes. Companies gave widely variable information on what ton system I needed, what additional work I needed to the existing ducts, where to put the outdoor unit, etc--one company did this over the phone without even inspecting the existing duct work setup, based on house square footage alone (which is totally wrong!)! Luckily, I have a friend of a friend who owns an HVAC company who could review the quotes. He looked at my house and ran his calculations and told me that Nur was spot-on with their analysis of the appropriately sized system and were giving me a very good price on an excellent system. Nur responds faster to email than any other company and always answered my questions. I worked with Artur who patiently answered all my questions by phone (and I had lots of them while I decided whether / how to do this project!) and told me about local incentives I wasn't aware of and Nur helped me apply for them (TechClean, PCE rebate and loan). I made my final decision to do the project with Nur in early December and they were able to schedule the job in time to get the last federal incentives of 2025. They even bumped up the start date of the work when they had a window to do it. The project took about 2.5 days. Their workers were courteous, clean, and thoughtful. They put down tarp everywhere inside so they didn't get the floors dirty. They went through each room to tweak the system to get adequate airflow to cooler rooms and less to warmer ones. They did thoughtful touches I didn't even ask for such as painting the lines outside to match the exterior paint of the home! Even after the job was complete, Artur continued to answer my questions by text and phone about how to best use the new thermostat. I just had the city inspection and the inspector said he had worked with Nur many times and they always do great work. In addition to passing it after a detailed evaluation, he called it a "beautiful installation job". Would definitely recommend Nur to anyone looking for HVAC service, repair, or replacement in the Bay Area!”
“Amazing, 10/10 experience with David, Sergei, and the rest of the NUR team. They completely overhauled my HVAC -- installed two dual-fuel furnace/heat pumps, two ductless mini split units, and completely re-did ductwork. The entire process was seamless from start to finish, including David coming to my house several times to walk me through different options before I had committed anything. There was no upsell, pressure, or anything like that - just honest/professional service and technical suggestions. The installation itself was smooth, taking less time than originally estimated with attention to detail. These guy do not cut corners! Anyway, take the time to speak with a handful of HVAC companies but, in the end, you will not find a better, more thoughtful, thorough, and professional crew than NUR. All done at a very fair price (compared to other companies).”
Google Reviews
What our customers say on Google
“Phenomenal Service – Furnace Replacement & Heat Pump Installation! I can’t say enough good things about the team at Nur HVAC! They recently installed a brand-new AC heat pump system for us and replaced our old gas furnace, and the experience was top-tier from start to finish. The installation was completed with incredible attention to detail, craftsmanship, and professionalism. They found smart, creative ways to route all the new wiring while opening as few walls as possible. For the couple of small spots where wall access was necessary, they made sure everything was fully patched, finished, and painted so seamlessly you’d never know any work had been done. On top of that, what stood out the most was their commitment to going above and beyond—they stayed late working extra hours just to ensure our Google Nest thermostat was fully integrated, tested, and working perfectly before they left. It’s rare to find contractors who are this reliable, clean, knowledgeable, and genuinely dedicated to customer satisfaction. If you need any HVAC work done, save yourself the hassle and hire Nur HVAC. Outstanding job all around!”
“Our old A/C unit went out (dramatically spewing coolant everywhere) in the middle of summer. We contacted Nur HVAC and got them to come take a look at the situation. They recommended replacing our old furnace with a new heat pump along with the new A/C unit. It took a few weeks for a permit, but then they scheduled the job promptly. It was very labor intensive...removing the old equipment, building a new platform with plywood, installing everything. It took 3 full days, but they did an excellent job and cleaned everything up completely when they were finished. The system looks and works so much better now. Workers were polite and respectful. Would definitely recommend.”
“Purchasing a new furnace or HVAC system may not seem like a personal decision at first. Most people focus on the equipment itself, the price, the company’s reputation, and the research that goes into making the right choice. You interview several companies, compare features, warranties, pricing, and timelines, and eventually make a decision. But what you quickly realize is that you are also inviting people into your home to install a system you hope will serve your family for many years. The people doing the work matter just as much as the equipment they install. Nur HVAC Systems was one of several companies I researched and interviewed to replace my aging furnace, all of the ductwork throughout my home, and every register. This was not a straightforward installation. The furnace needed to be relocated, asbestos had to be professionally removed, and there were several other complexities that made this a challenging project. Nur was my final interview, and after meeting Fedor, I knew without hesitation that he was the right person for the job. After speaking with several companies, he was truly in a league of his own. He brought thoughtful, innovative, and cost-effective solutions that no one else had suggested. His experience and confidence immediately gave me peace of mind. The project began with the removal of old asbestos materials, coordinated by a team Fedor assembled and led by Antonio. They worked efficiently, meticulously, and safely, completing the job without a single issue. From there, the project moved on to removing the old furnace, ductwork, and registers before installing the entirely new system. Fedor’s team was nothing short of exceptional. Vitaliy, Leandro, and engineer Arthur were outstanding. When construction is taking place throughout both your basement and your main living areas, it inevitably becomes personal. Having these three professionals in my home was genuinely a pleasure. They worked incredibly hard, but they also worked intelligently. They were respectful, courteous, professional, and remarkably kind. What could have been a stressful and disruptive experience instead felt organized, comfortable, and surprisingly easy. Most importantly, the quality of their workmanship was outstanding. Every challenge that arose was handled with confidence and expertise. It was obvious that these men truly know their craft. I had complete trust in their abilities from beginning to end, and they exceeded every expectation. What initially drew me to Nur HVAC Systems was that I never felt like I was hiring a single salesperson or simply buying a product. I was hiring an entire team. A successful project depends on every person doing their part with excellence, and that is exactly what Nur delivered. From planning and communication to execution and craftsmanship, every member of the team reflected the same high standards. If you are looking for a company that combines technical expertise, integrity, professionalism, and exceptional customer service, I recommend Nur HVAC Systems without reservation. They didn’t simply install a new HVAC system. They earned my complete trust, and I would confidently hire them again and recommend them to my family and closest friends.”
“NUR HVAC just completed installation of a Mitsubishi heat pump system in my San Francisco home, replacing a 38-year-old Lennox gas furnace. I couldn't be more pleased with the quality of the work and the professionalism shown during the process. In particular, I wanted to commend Artur and Vladimir, the NUR technicians who did the beautiful install. Both guys were extremely polite and respectful, for example, putting on shoe covers whenever they entered the house. Artur was also very fastidious in running the ancillary electrical feeds to my main service panel. What a neat job! Fedor, who came to do the initial assessment, was a great resource and answered all my questions regarding scheduling, warranty, maintenance, etc. He offered several options during the bidding process without any pressure to come to a quick decision or attempts at “upselling.” In the end, their quote was very competitive, and fair given the quality of the work and the final product. Being a Mitsubishi Diamond Contractor, NUR was able to offer a 12-year warranty on parts and labor. The bottom line is NUR is a top quality outfit and it was easy to see that they take great pride in their work and genuinely care about their customers. NUR may be the best contractor I’ve ever used. Definitely, 5-Star!”
“I hired Nur HVAC for a major upgrade to my home's system, and they did an incredible job. The project involved converting my entire house from a gas heat pump to a new all-electric Mitsubishi system, and they also installed a split unit in my garage. Their prices were very reasonable, but what truly stood out was the professional quality of the installation. The team performed a very careful evaluation of all my existing ducts and vents to ensure the new system was installed for optimal performance. The work speaks for itself. It's been almost two months since the installation, and everything is working top-notch. I'm super happy I chose Nur HVAC and highly recommend them.”
“We used Nur HVAC to replace gas furnace with a heat pump inverter, replace the aging duct work and gas water heater with a heat pump water heater, all in the same contract. Our project manager, Arthur was on-time for the scoping appointment. He took time to understand our needs, investigated the attic, ducts and all the existing equipment, before making any recommendations. He designed the optimal system for our house to be cost effective, provide highest comfort and be energy efficient. He was not pushy and was upfront about the ballpark estimates and timeline. He also walked us thru the various rebates that are available for the replacements from local utilities. Arthur’s quote was very competitive, in fact better than those quoted to us by Costco referred contractors. Nur’s installation crew - Eldar, Bhakridin, were very professional and thorough. They didn’t rush the job and left the job site clean and clutter free each day. They accommodated our requests for placing the electrical wires and conduits so they are not in the way. All the equipment both indoor and outdoor were cleanly laid out, secured and wiped down before hand off. Always smiling and respectful, one of the best installation crew we have had. As a white glove contractor they took care of all the permitting, inspection paperwork w/ the city, all the paper work for us to receive the rebates. They even completed the warranty registration with the manufacturers for all the equipment! We would highly recommend Arthur and Nur HVAC to anyone in the Bay Area needing heating and cooling solutions. We would definitely be going back to them ourselves when the need arises.”
“5/5 Stars - Highly Recommend Adlan and Nur HVAC! We had an exceptional experience with Adlan from Nur HVAC today. He is a consummate professional—extremely thorough, transparent, and honest. Our AC was completely out of refrigerant (6.5 lbs low), and instead of pushing an expensive and potentially ineffective nitrogen test on a hidden leak, Adlan gave us a practical, data-driven strategy to get our cooling restored for the summer while tracking down the issue. He thoroughly explained the system’s metrics, including a high compression ratio, and gave us fantastic, low-pressure advice on how to plan for our home’s long-term HVAC compliance and transition over the next couple of years. On top of that, he diagnosed a long-standing airflow bottleneck to our second floor. He took the time to inspect our complex crawlspace ductwork, confirmed the structural equipment is in great shape, and laid out a clear plan to return for a whole-house air balancing service. Finding a technician with this level of technical expertise and genuine integrity is rare. Request Adlan if you want the job done right. Thank you, Nur HVAC!”
“Nur installed and serviced our heat pump since the beginning of 2025. Quality of work, including the air handling, heat pump, ductwork, piping and electrical work was excellent. There were communication issues with the field crew but were ultimately resolved. Only with the recent warmer weather I used the cooling stage (instead of the heating) and came across a problem where it wasn’t cooling fast enough. Artur A. came back, checked all the vents and adjusted the air handling speed so it cools down much faster. Nur was responsive and fairly quick to correct our concerns. They were also quick to return and service our cooling issue. Thank you David and Artur A.”
“I had a great experience all around with Nur HVAC. Scheduling with Regina was a breeze, and Adlan, our technician, was fantastic. Adlan quickly diagnosed and fixed an issue with our 20 year old AC unit on the spot without trying to upsell anything. Beyond the quick repair, he took the time to walk me through his process for diagnosing/assessing our AC system as well as the steps for a routine furnace maintenance - I learned a lot along the way. Highly recommend Nur HVAC, and especially Adlan!”
“Very pleased with their heat pump installation. I got three quotes and theirs was just a little lower than the others, but I chose them because they explained everything very well. They did not try to upsell like the other companies, which I appreciated. Installation went quickly and everyone was very pleasant. Photo with Arthur and our heat pump. Update, year and a half later: everything is working well. They helped me apply for the rebate after it was installed. I asked if I should do maintenance and they showed me what kind of filter to get. David came by and checked everything over (2nd photo) and didn't even charge because nothing was needed beyond changing the filter.”
“This visit was a maintenance check on our 2 mini splits that were installed about 18 months previous . Islam D showed me how to clean the filters ( which was easy ) and he inspected the unit on our roof. The visit was prompt, professional and informative as I had several questions on the workings of the mini splits. We are very pleased with these units and the service we've received from Nur HVAC.”
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