Marathon Plumbing, Heating and AC Repair
Company Overview
Established in 1990 in Covina, Marathon HVAC Services is a top choice for heating, ventilation, and air conditioning needs. We have certified professionals who specialize in high-quality air conditioning installations, extensive furnace repairs, and precise maintenance services. We are dedicated to optimizing indoor air quality systems for homes and businesses alike. Our dedication goes beyond just providing services.
Rely on us for energy-saving, cost-effective options designed to meet your individual needs. With 30+ years in the industry, we are devoted to upholding exceptional quality and customer satisfaction in all our work. Discover the Marathon HVAC Services difference.
Marathon Plumbing, Heating & Air, a family-run HVAC company, has been serving our local community since 1990. Our services encompass all aspects of plumbing, heating, and air conditioning, with particular expertise in older units. Our skilled team, as an independent dealer of dependable American Standard Heating & Air Conditioning products, ensures top-quality installations. We also provide the latest in indoor comfort solutions, including eco-friendly HVAC systems and smart technology for remote access, keeping your home comfortable throughout the year.
Our background in residential heating and air conditioning guarantees your home and family will remain comfortable. For personal service, I am readily available to answer any inquiries you might have.
Business Services
- Bathtub installation
- Bathtub repair
- Drain installation
- Drain repair
- Faucet installation
- Faucet repair
- Garbage disposal installation
- Garbage disposal repair
- Gas line installation
- Gas line repair
- Plumbing inspection
- Plumbing installation or replacement
- Plumbing repair
- Sewer installation
- Sewer repair
- Shower installation
- Shower repair
- Sink installation
- Sink repair
- Sump pump installation
- Sump pump repair
- Toilet installation
- Toilet repair
- Water heater installation
- Water heater repair
- Water pipe installation
- Water pipe repair
Business Location & Hours
Mon: | 8:00 AM - 5:00 PM |
Tue: | 8:00 AM - 5:00 PM |
Wed: | 8:00 AM - 5:00 PM |
Thu: | 8:00 AM - 5:00 PM |
Fri: | 8:00 AM - 5:00 PM |
Sat: | Closed |
Sun: | Closed |
Recommended Customer Reviews

Nino is awesome! Best technician ever. So fast and thorough. And Honest! Mille Grazie Nino!

Matt was awesome. Great communication and personality as well as working to resolve our issue.

HVAC service was superb! Very considerate of the home and cleanliness. Thank you Fernando for the expert care.

amazing experience with Joziah. really effectively addressed our units problems! very timely and efficient. all in all a great job

I've used them for over 10 years now and they always do a great job. Eric came and took care of my house explained everything in detail and I was very happy.

I am very satisfied with the services provided by Marathon HVAC. I already have 3 projects completed by them this year of 2024. First was the duct repair. The second was was the replacement of my gas water heater with a tankless water heater. The third project is replacement of my AC unit with a heat pump. They provided exceptional professional service at a very reasonable price. Leo, Chris and Paul have been very responsive to my questions and went above and beyond in educating us with these systems as these are major investments for a homeowner. Their back office support is also very professional and friendly. When you work with Marathon HVAC, you feel very confident that they will take care of you and not just to make a sale transaction. Before hiring them for these projects, I went to shop 5 other companies to compare which can provide the best value. Marathon HVAC is somebody you can trust who will take care of you. I highly recommend them.

WOW, what an excellent job these guys did. I cant thank you enough leo for the professionalism and the quality of work you did. I appreciated how you walked me through every section and explained plainly what was needed, then you executed like a pro. my hat is off to you you and the crew...THANKS

Mom paid 4k for a 2 year old AC to be serviced with any repairs necessary so it works to a certain standard and now 2 months later it stopped and they came back to check and said it will be another 300 to fix something else, when I spoke to the manager he said this is common with this brand to have issues over and over again and wanted to quote me for a new AC to take more money ! Why would you not say this initially and steal 4k and then try too make more money off selling a new AC instead of fixing the ac you just serviced yourself!
Just called me back saying 99 dollar inspection fee now since we don't want the work even though I was told they would diagnose for free over the phone when I made appt!! Do not do business here!!!

Design Air Inc./ now Marathon HVAC Services - Excellent and fast service, knowledgeable team at all levels, from customer service to individual service professionals / technicians working on site. Everyone is helpful and thorough. I have used Design Air Inc./ now Marathon HVAC Services since 2013 because of their high standards and professional level of communication, knowledgeable project planning and skilled quality workmanship, customer follow-up processes and fast emergency response times for small- and large-scale projects. The whole team cares about the customer and the task at hand. Yes, they all work as a team and that makes the whole process seamless. Design Air Inc. / now Marathon HVAC Services is on my speed dial for any of the HVAC and plumbing needs.
Each employee is respectful, helpful, thorough, thoughtful, fast and cost and time efficient, patiently answering questions and providing explanations.
You get greeted by the friendly and helpful team of April Barnes and Jazmin Fisher in the office.
For HVAC I have had the skilled and professional Paul Davidson design and install a whole house HVAC system, and annually serviced by either Jeremy Mariona, Leo Zepeda, or Karley Davidson.
For all emergency plumbing, Chris Williamson was fast, efficient, and provided quality work.
Thank you to the whole team!

Stop spamming me so much I keep getting unwanted unsolicited emails and texts it's annoying