Some service calls turn into big projects. Others come down to one small part. This one, in San Francisco, was the second kind. The visit was booked as a furnace service call and ended with an A/C run capacitor replacement. It was also a familiar address for us. We have been working on this home’s heating and cooling since last summer, so our technician walked in already knowing the layout.
What we looked at on site
The mechanical space here is compact and busy. The air handler sits on the floor with an insulated supply plenum above it and an insulated line running across the top of the cabinet. Storage boxes and shelves share the room, which is normal for a lot of San Francisco homes, where every square foot has a job.
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Close by is a Munchkin high-efficiency boiler with its insulated piping and circulator pump. It is a lot of equipment in a small footprint. On a call like this we look at the system as a whole, not just the piece named on the work order.
Why a run capacitor matters
A run capacitor is a small part with a big role. It gives the motors in an air conditioner or heat pump the electrical boost they need to start and keep running smoothly. Capacitors wear out over time. When one weakens, a motor can struggle, hum, or stop altogether, and the system stops doing its job. Swapping the capacitor is a common, straightforward repair once it has been identified as the problem.
That is what this visit came down to. Our technician replaced the run capacitor during a stop of about two hours on site, including the time spent checking the equipment.
A home we know well
This was not our first visit to this property. Over the past several months we have done quite a bit of work here:
- An A/C service call in July 2025
- An outdoor heat pump control board replacement, a defrost sensor replacement and a suction line insulation repair later that month
- A Mitsubishi 2.5-ton heat pump and air handler installation in August 2025, along with an EcoBee thermostat and wiring extender kit, a Bryant air purifier and ductwork
Coming back to a home you already know makes service calls easier for everyone. We know where the equipment lives, how it is set up and what has already been done, so the visit can stay focused on the problem at hand.
If your system is acting up and you are not sure where to start, our HVAC repair team handles service calls like this one across San Francisco and the Peninsula. Sometimes it is a big fix. Often it is one small part, and that is a good day for everyone.
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Reviews
Trusted by your neighbors
“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.”
“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.”
“This is the second project I've done with this team, and there's a reason I keep coming back: Trust. When my water heater went out, Fedor showed up the same day to walk me through my options. I have a tendency to "over-buy," and I was actually leaning toward an expensive heat pump model. Instead of just taking the bigger check, Fedor was honest with me--he explained that the ROI on that specific unit wouldn't be recovered in my lifetime given complex electrical work required. Once we picked the right system for my actual needs, he had a crew at my house within two days to finish the install. They were professional, clean, and efficient. It's hard to find an HVAC company that values integrity as much as they do. They've earned a customer for life!”
“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!”
“Highly recommend Nur. From start to finish, this was an excellent experience. The sales guy, Fedor, did an excellent job explaining our options, giving us multiple quotes, and responding to my various follow up questions. Then, the installer, Islam, was super professional. He was very careful to protect my floors, to make everything look great, and to show me how to use the system. Most importantly, he discovered an oddity in my return ducts, having to do with an addition we did years ago. This required him to have to come back to relocate the air filter. Again, he was super professional through that as well. The price was very competitive and the service was top notch. Thanks and best wishes to the Nur team.”
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!”
“Nur HVAC recently installed a mini-split system in our SF condo; one in the living room, and one each in the two bedrooms. They installed the heat pump outside on the balcony. I was impressed with their work ethic and the way they kept our space clean during the installation. They cleaned up at the end of each work day and were very respectful and thoughtful of our home, our dog, and us. They communicate clearly and quickly; I would highly recommend them to install an AC system.”
“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.”
“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!”
“This is my second experience with these awesome people. Nur HVAC installed a heat pump a year ago and I remembered how professional they were. So when my water heater broke few weeks ago I called them again. Fedor called me and came over the same day to personally inspect my setup. He gave me three options for my water heating needs and coached me through the selection process based on my current and future needs. This was Monday and by Wednesday I had everything fixed! As always, professional and courteous service. While Fedor was here I got to talk to him about options for more even heating and cooling distribution in my house. Even though it was not related to problem at hand, he patiently explained to me what my options were and then turned me onto a new solution using smart vents. This ended up being 10x cheaper than dual zoning and works a 100 times better. This guy is so smart, he must have a Ph.D. in HVAC!!! Thank you Fedor and I can’t recommend this team highly enough!!!”
“We replaced our 25-year old single phase gas furnace with a Mitsubishi HVAC heat pump this summer. Now that we’ve used it for both cooling and heating, I’d like to give the team at Nur a five-star rating for their clean, smooth installation. Communication was great and they were thoughtful about system design so that we don’t have exterior conduits. We are so happy with the operation of the system for heating: it is quiet and so much more effective than our old furnace. We can highly recommend Nur.”
“I highly recommend Nur HVAC. They recently installed a heat pump system and two mini splits at my house. The units are extremely quiet and work well. I found all of the Nur personnel to be professional and courteous with excellent integrity. The mini split placement was tricky in one of the rooms, and they brought in a bigger team to carefully consider the pros and cons of various options before making a final recommendation and explaining the considerations to me. They did a fabulous job of communicating with me and they did high-quality work. The installers even painted exposed outside pipes to match my stucco, so the pipes are quite unobtrusive. The electrical inspector came yesterday and was smiling when he remarked to me, "They did nice, clean work!"”
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