Replacing a Gravity Furnace with a Modern Ultra Low-NOx System

Ultra Low-NOx gas furnace Payne

Type of work performed: Complete furnace replacement and ductwork upgrade

Area of the room, m²: 170m²

Material/technique used: Payne gas furnace (Ultra Low-NOx), R8 insulated flexible air ducts

Location: Downtown San Jose, California

There are houses that are not just historical in their walls, but also in the systems behind the walls. The heating system in this downtown San Jose project was decades old. The house was dependent on a very old gravity furnace with asbestos air ducts – which was once a common thing, but nowadays, it is a serious safety, efficiency, and comfort issue. The homeowner was ready to have a full upgrade and wanted something that was safer, quieter, and more energy-efficient without making the house a construction site.

The primary demand of the client was not complicated but urgent: to change the old-fashioned gravity furnace and to get rid of the asbestos ducts finally. The ancient system was uneven in heating the house, used a lot of gas and made audible noise. More to the point, the ductwork contained asbestos, which was a long-term health hazard. The homeowner desired a contemporary gas furnace that would comply with California emissions requirements and remain within a decent budget.

The most significant problem was the state of the current system. Gravity furnaces do not use controlled airflow, but instead use natural air movement, and this required a complete redesign of the entire distribution concept. To add to that, asbestos ducts must be handled and removed with care according to the safety regulations. This was not a mere replacement but a complete modernization of the heating system in the house.

Our team began by decommissioning the old furnace safely and organizing the removal of the asbestos air ducts through the approved containment and disposal procedures. After clearing the space, we installed a new Payne Ultra Low-NOx gas furnace. This model was chosen with the specific purpose of meeting the stringent air-quality standards of California and providing a reliable performance. In order to accomplish the upgrade, we planned and installed a new duct system with R8 insulated flexible ducts, which would guarantee efficient airflow and minimal heat loss in the home.

Once the system was commissioned, room-to-room airflow was adjusted, and the furnace was adjusted to maximum efficiency. The result was immediate. The house now warms evenly, operates much more quietly, and reacts promptly to thermostat changes.

Under the new system, the homeowner does not need to be concerned with asbestos exposure, uneven temperatures, or high gas consumption. The upgrade has changed an old and possibly dangerous system into a safe, modern, and reliable heating system.

This downtown San Jose project demonstrates that it is not only about comfort when it comes to replacing an old gravity furnace, but also about safety, efficiency, and peace of mind. The home was brought out of decades-old technology by replacing the furnace and ductwork with a system that was built to meet the current standards and future requirements.

The homeowner will be able to anticipate significantly reduced gas bills in the heating season due to increased efficiency and enhanced heat distribution. The Ultra Low-NOx furnace also assists in preventing the possible future expenses of non-compliant equipment in California.

The reason why a Payne gas furnace was selected in this project is that it provides a good compromise between cost and dependability. Payne is a low-cost brand of Carrier Global Corporation, which has a good reputation in terms of high reliability scores, silent performance, and good energy efficiency. This furnace offers reliable comfort with a standard efficiency rating of approximately 80% AFU and a multi-speed blower motor that does not need any unnecessary complexity. Systems such as this can easily serve a home of 15 years or more with regular annual maintenance.

To maintain the furnace in good operation, change or clean the air filter once or three times a year, particularly during peak heating season. Arrange professional maintenance at least once a year to check burners, heat exchangers, and airflow. Vents should also be kept clear to ensure that the home is evenly heated.

Phone: (408) 733-2000

Email: info@airandplumbing.com

Still relying on an outdated furnace or unsafe ductwork? Contact our team today for a professional evaluation and see how a modern heating upgrade can make your home safer, quieter, and more efficient.

Air & Plumbing Systems
4.8
Based on 193 Reviews
K. B.
K. B.
2026-04-22 06:54:01
Hired Air & Plumbing for my HVAC diagnosis and replacement. Will update review on competion. read more
Aryan M.
Aryan M.
2026-04-06 19:02:24
I recently worked with Air and Plumbing Systems Inc for a complete HVAC system upgrade from an old furnace to an all-electric heat pump and air handler…. read more
Frank A.
Frank A.
2026-04-02 10:35:14
Great, professional installers. On time and on budget. They replaced my HVAC system and moved it to the attic. They also installed a tankless water heater…. read more
Albert G.
Albert G.
2026-03-21 13:32:05
As goood as it gets! called 8PM and asked to fix the problem which other AC company failed to fix on time. Was done by 10am next day! Appreciated and highly… read more
Lisa C.
Lisa C.
2026-02-11 12:48:10
Great service! Friendly, fast, put in a new hot water heater for us and we didn’t even need to be home, since it’s on the side of our house. Will definitely… read more
Charles C.
Charles C.
2026-02-05 15:16:51
We had a great experience working with Air and Plumbing Systems. They replaced our gas furnace and central A/C with a Heat Pump system (indoor and outdoor… read more
Mark T.
Mark T.
2025-12-31 11:35:51
I had my furnace of 15 years fail due to a cracked heat exchanger. On Monday Dec 22nd, I had contacted the company that originally installed it to price out… read more
Andrew B.
Andrew B.
2025-12-30 14:24:04
Mark handled my gas water heater replacement with a heat pump water heater. Mark is very professional and prompt handling my questions and installation… read more
Donald S.
Donald S.
2025-12-17 16:04:16
When I requested bids to replace a water heater, Air and Plumbing was the first one to come out to make a bid. Their bid for replacing a gas water heater… read more
Paul N.
Paul N.
2025-11-26 14:18:44
I recommended Air & Plumbing to all my clients and everyone looking for new systems or repairs. after six months searching and looking for a company I… read more
George ..
George ..
2025-10-26 22:01:40
Great response time for the appointment. Professional service. Fixed the problem. I would use them again. Note that their service charge quote was the… read more
Mary C.
Mary C.
2025-10-11 17:07:14
I had a great experience working with Mark and his team.Mark is super responsive and professional. When I was working with him for my heat pump air conditi… read more
Alan K.
Alan K.
2025-09-19 18:58:30
Mark installed my HVAC last year. He had some issues due to a defect on the Carrier HVAC. Mark came back and troubleshoot the system to get it in working… read more
Maia S.
Maia S.
2025-08-24 15:40:46
Eugene was able to come out same day (Saturday) to do an inspection when our air conditioner stopped circulating cool air. He was so efficient and… read more
Wenlong L.
Wenlong L.
2025-07-17 17:29:43
The good side is that Mark responded quickly and set up an appointment for the next day. The diagnostic price is the lowest of what I know of. Both the… read more
Carolyn H.
Carolyn H.
2025-07-12 14:38:42
Our AC unit was blowing warm air. After I sent a request for service, Air & Plumbing answered me with a quote for service charge of $49 and that they have… read more
Sean I.
Sean I.
2025-06-04 19:04:52
Right after a recent heatwave it became obvious that my upstairs AC was barely working. It’s over 30 years old and a heat pump so expected to be told that I… read more
Hannah G.
Hannah G.
2025-06-04 15:10:01
Great service. A technician was at my door within a few hours after I first got in touch with them. He was very helpful and honest. He was able to do what… read more
Hadi Khazraee
Hadi Khazraee
2025-05-29 14:08:07
We had Air & Plumbing Systems install two heat pump systems for our house. The cost was very reasonable and we could not be happier with the service we… read more
Mark C.
Mark C.
2025-05-27 17:47:37
Edward did a fantastic job helping us install the mini split system. Great communication great work! This is the third time using this company for the past… read more
Andrew B.
Andrew B.
2025-05-13 14:12:41
It was that’s time that my air-conditioning system needed an upgrade, so I called my trusted company and they delivered an excellent job. System… read more
H. N.
H. N.
2025-05-06 10:51:38
After online request for information and pricing, I decided to have A&PS come out for diagnostic visit for our water-leaky AC indoor unit. Eduard spent… read more
Misha S.
Misha S.
2025-04-14 11:27:02
Best company I ever use in my life responding right away. Prices is the best and getting job done very well thank you. read more
Gary
Gary
2025-02-13 18:28:07
we hired A&P Systems because we had a strong smell of gas when the heater came on. The technician Eugene, was on time and was very professional as he… read more
Jilong K.
Jilong K.
2025-02-08 14:55:23
Great service and reasonable price. Highly recommended. They offer lower diagnostic fee for the first visit. read more
Yuankun X.
Yuankun X.
2025-01-17 20:20:03
Eugene is fantastic. Our furnace shut down all of sudden and stuck at lockout state, despite many resetting attempts. It was a Friday afternoon and hard to… read more
Bosco F.
Bosco F.
2024-12-17 11:34:35
I met Mark Fridlyland of Air & Plumbing Systems several years back in a “save energy” type of open house for contractors in Los Altos. I ended up using his… read more
Aarthi R.
Aarthi R.
2024-11-15 19:23:50
Eugene was helpful in resolving our furnace issue. He responded quickly to our service request and was able to diagnose and fix the problem within an hour…. read more
Bob R.
Bob R.
2024-11-02 08:50:38
I recently discovered that my furnace was 26 years old so I decided to replace it before winter. Since this summer was unusually hot I decided to add an… read more
Alon M.
Alon M.
2024-10-01 16:37:12
Highly recommended! We hired A&P Systems to replace our duct system. They came in and did very professional work, in addition to a very reasonable price…. read more
Deanna C.
Deanna C.
2024-07-06 11:59:18
I don’t write reviews often, but the exceptional response and service merits recognition since we really appreciate the fast online response and Eugene who… read more
Yuting L.
Yuting L.
2024-07-02 17:07:34
Very responsive and professional. I scheduled an appointment within 12hours. My ac problem got targeted and solved very quickly. Awesome experience. read more
Ruogu L.
Ruogu L.
2024-06-29 18:09:44
Contacted these guys in the afternoon, and they sent Caesar to my house in 1 hour. Caesar is knowledgeable and friendly, quickly identified the problem of… read more
Tianwei X.
Tianwei X.
2024-06-24 12:04:14
Respond quickly and solve the issue immediately. The diagnostics fee is low, but not sure how the repair cost compares with others. read more
Robert
Robert
2024-06-23 21:05:39
Our AC broke down, but we got a working AC within 2.5 hours contacting them on a Sunday. Reasonable price, outstandingly fast response, I will definitely… read more
Chris L.
Chris L.
2024-06-23 15:49:51
Heat wave and our AC stopped working! Late afternoon on a Sunday! And with two little ones in the home. Used Yelp to request estimates, A&P responded almost… read more
Conrad S.
Conrad S.
2024-06-09 17:18:04
Fast response. Reasonable cost. Highly recommended. Would choose them again. Got our AC working very quickly. read more
Rebecca E.
Rebecca E.
2024-06-05 20:49:00
My ac stopped producing cold air today, the hottest day of the year so far. I was able to get it fixed same day! I’m so grateful. Thank you. read more
Sina M.
Sina M.
2024-05-28 09:09:36
Fast response and summer inspection for our AC system. I highly recommend this service. read more
Boris G.
Boris G.
2024-05-21 21:37:46
Installed ac with Air and Plumbing Systems, and it was the best experience I ever had with contracting services company. read more
Misha S.
Misha S.
2024-05-21 21:29:46
Those guys put the air condition for me in my house three or four years ago. They did the maintenance on it right now. I’m so happy they are great people. I… read more
Shlomi G.
Shlomi G.
2024-05-05 13:33:06
I called Mark for help after my HVAC contractor failed to deliver. He was quick to respond and completed the work in a professional manner. I would… read more
Virginia N.
Virginia N.
2024-04-12 12:57:50
I don’t write many reviews.  However, I feel that when someone provides exceptional service and performance they should be recognized.  Air and Plumbing are… read more
Tim T.
Tim T.
2024-03-08 11:38:21
Worked with Mark to get my heat pump water heater installed to replace my gas water heater. Eduard came out and did a very professional job installing a 65… read more
Kevin L.
Kevin L.
2024-03-03 08:16:11
It took some back and firth and several visits, but we were able to get the attic fan issue resolved! read more
Alan K.
Alan K.
2024-02-17 10:55:17
It was great working with Mark and his team. They provided a fair price. They arrived on time and were prepared for the job. On the day of inspection they… read more
Tom J.
Tom J.
2024-01-28 14:31:22
I had a great experience with Air & Plumbing Systems Team on two different occasions. The company both installed a new water heater for my house and some… read more
Kevin L.
Kevin L.
2023-12-21 08:31:37
We contacted Air & Plumbing Systems about getting a heat pump water heater installed. In the process, we also wanted to get an electric car charger and… read more
Malathy A.
Malathy A.
2023-07-25 15:28:59
Our downstairs AC unit wasn’t functioning properly. It was very easy to schedule a service.The tech showed up on time and gave us the diagnosis. The AC… read more