Old furnace struggling on a cold hillside night, or a room addition that never got proper heat? TOP AC repairs, replaces and maintains heating systems in Santa Susana Knolls, with same-day service and a written price before work starts.
Santa Susana Knolls is a rural hillside pocket of Simi Valley where many homes are older, sit on larger lots and have been added onto over the years, and heating systems often reflect that history.
The community grew up around the Southern Pacific depot built here in 1903, and part of it is still unincorporated county land rather than inside Simi Valley city limits. At roughly 1,165 feet on the north slope of the Simi Hills, nights run cooler than on the valley floor. TOP AC repairs, replaces and maintains heating systems across Santa Susana Knolls, using licensed technicians dispatched from our Simi Valley office.
Book Heating Service
Many homes here predate the newer Simi Valley tracts, so original furnaces and wall heaters are still common. Worn burners, tired blower motors and cracked heat exchangers show up first on the coldest nights.
Over the decades, owners add rooms, convert garages and build guest spaces. The original heating system was rarely resized, so new rooms stay cold. Extending ducts or adding a ductless unit is often the fix.
Sitting at about 1,165 feet against the north slope of the Simi Hills, the Knolls cool off fast after sunset. A system that coasted through the fall is suddenly asked to work hard before sunrise.
Homes here are more spread out, with ducts running through crawlspaces and attics. Gaps, crushed sections and pest damage near open hillside land let heat escape before it reaches the room.
From an older furnace that will not start to heat for a room addition, every service below is handled by our own licensed technicians.
Ignitors, flame sensors and older wall heaters brought back to dependable heat in one visit.
New heating sized for the house as it stands today, including rooms added after the original build.
Replace an original furnace or wall heater that is past repair, with equipment that fits your lot.
Seasonal checks that catch worn parts on older systems before the first cold hillside night.
Cleaning and tuning that restores output on aging furnaces and extends their life.
Heat exchanger, venting and gas connection checks on systems decades old.
Same-day help when an old furnace quits, in Santa Susana Knolls proper or the surrounding hills.
Furnace repair and replacement in homes where original equipment is still running.
Electric heating and cooling from one system, an option for homes moving away from old gas heat.
Mini-splits that heat converted garages, guest rooms and additions without new ducts.
Plain-language findings on why an older system fails and what each fix costs.
Thermostat and control upgrades for systems that were never wired for modern controls.
Duct repair for crawlspace and attic runs damaged by age, gaps or pests.
TOP CLUB visits that keep older heating equipment on a regular maintenance schedule.
Tell us how your older heating system behaves and we will recommend the fix that makes sense.
Get a Free EstimateRegular visits to keep older equipment running, priority booking and 15 to 25 percent off repairs, from $15/month.
EXCELLENT Based on 121 reviews Posted on יניב אליאסTrustindex verifies that the original source of the review is Google. Our old AC was constantly causing issues, so we decided to replace it. After getting five estimates, we chose Top AC — and we’re very happy we did. Ethen was professional, honest, and great to work with. The price was fair and right in the middle of the market. The team arrived on time, did a clean and proper installation, and coordinated smoothly with our roofing company during our roof replacement. Highly recommend Top AC — reliable, professional, and excellent service.Posted on Orit RavidTrustindex verifies that the original source of the review is Google. Can’t recommend TOP AC enough! My heater stopped working and they showed up the same day I called, diagnosed the issue quickly, and had it fixed right away. Super professional, honest, and the price was very fair. Such a relief to work with a company that’s reliable and efficient. I’ll definitely be using them again.Posted on Gary BatchleyTrustindex verifies that the original source of the review is Google. The guys were great and showed us how to use everything.Posted on Jasmin RoggTrustindex verifies that the original source of the review is Google. We had a new HVAC system installed and also replaced the old vents. Service and installation was professional, good and quick. My allergy is finally gone!!! I am over the moon happy. Thank you, Adi 😊😊😊Posted on Jonathan BrayTrustindex verifies that the original source of the review is Google. Great experience with these guys. Our furnace kept cutting out and Ethan was very helpful and responsive on the phone. He sent Frank out and Frank was fantastic. Fixed it (fuse sensor) and answered all my questions and charged what they said they would. Will definitely be using them again. Thanks!Posted on Roxanna ZibachTrustindex verifies that the original source of the review is Google. Top AC is the best!! Ethan and Frank provide excellent customer service, reliable work and all for a great price!!Posted on evi starTrustindex verifies that the original source of the review is Google. Amazing value and impressive results. The initial cost was reasonable, and the crew really knew their stuff. They left everything spotless and took the time to explain the whole process. My ducts are sparkling clean! Great job!Verified by TrustindexTrustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more
EXCELLENT Based on 223 reviews Posted on Tae Jung K.Verified Problem: AC is running but no air is coming out. Quality: Inspected every single details with care . It was a clogged filter that needs to be replaced. Thanks to Frank. Value: It took less than hour to fix the issue. Great value. No hidden fee.Posted on Alison C.Verified Great experience with Top AC. Ethan was responsive and easy to connect with to schedule a tech for routine maintenance. Frank was the technician and he was polite, informative about what he was seeing, communicative, and friendly. This company is trustworthy and I've already recommended to my neighbors. Prices are very fair and I've really glad I've come across this company as I will continue to utilize them for my HVAC service and future needs. Thank you!Posted on Johnny A.Verified Our old AC was constantly causing issues, so we decided to replace it. After getting five estimates, we chose Top AC ,and we're very happy we did. Ethen was professional, honest, and great to work with. The price was fair and right in the middle of the market. The team arrived on time, did a clean and proper installation, and coordinated smoothly with our roofing company during our roof replacement. Highly recommend Top AC reliable, professional, and excellent service.Posted on Lee D.Verified Top AC is incredibly honest and trustworthy. I needed an urgent repair and even though they couldn't fit me in right away, they recommended I get a quote and inspection from another company so I could get help ASAP. That company quoted me $1,200. A few days later, Top AC came out, diagnosed the real issue as a small part (not what the other company claimed), and fixed it in an hour for $375. Itay is super helpful and trustworthy, and Frank is excellent at what he does. I won't use any other HVAC company.Posted on Gabby O.Verified I don't even know where to begin about how much I love this company. We have a nice house, but that doesn't mean I have any extra money. Our furnace went out and I called the company that had installed (but they always seem to charge me a lot) to come out and check it. The technician came up and calmly told me it was some sort of switch that needed to be replaced and the estimate would be $1265. I don't have $1265 but I was just curious how much the parts were so I looked it up. The parts themselves come to $16. A friend of mine recommended Adi & Top AC Heating and Air-conditioning, so I called them for a second opinion. Frank the technician came out, looked at it, pressed the reset button and it was fixed. It took him all of five minutes and all I was only charged was the diagnostic fee. Plus, he showed me how to press the button myself next time should it happen again! I can't believe another company was willing to take $1300 from me for NOTHING. Be careful of who you trust, but I can tell you that you can trust Top AC fully!!!!Posted on Donna T.Verified The first time I called, Top AC sent someone to repair my father's AC. Everything went smoothly. The second time I called this company, the problem was my father's heater. After speaking with Adi about the problem, he sent Frank to take a look at the problem. The problem was a simple fix, but Frank noticed that the pipe for the gas was loose. He recommended that I call my plumber to fix it. Overall, I appreciate this company's honesty and availability.Posted on Trent C.Verified Extremely polite and diligent. Got back to me in record time, putting this highly anxious first time home owner at ease. High marksPosted on Jamie S.Verified Our AC broke down on a Saturday. Isaac was fast and came out within 90 minutes. Good experience.Posted on Fred F.Verified I made request for immediate assistance with malfunctioning AC. Top AC sent Frank to my home in Burbank. He was very helpful and informative. It turned out that my rooftop unit, which he thoroughly inspected, was in good shape but there was an issue with my thermostat. Frank changed the program on the thermostat and it has been working fine since. I really appreciate good service when I see it. The fee was very reasonable.Posted on Eli S.Verified Great service! The specialists that came to do the work were amazing!! So glad we worked with them!Verified by TrustindexTrustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more
TOP AC has a local office at 5136 Cochran St, Simi Valley, CA 93063. Our own licensed technicians serve every Santa Susana Knolls street in ZIP 93063, including older homes on larger hillside lots.
A local crew, a clear price in writing, and heat restored without the runaround.
Tell us what’s happening and our certified technicians will contact you shortly.
Before you go — share a few quick details and we'll reach out with your free quote.
Tell us what’s happening and our certified technicians will contact you shortly.