Business ProfileHVAC Companies in Rancho Cucamonga, California

Reliant HVAC Service LLC

Listed in Rancho Cucamonga 5.00 (16 reviews)(626) 679-1882

Reliant HVAC Service LLC

Reliant HVAC Service LLC provides residential and commercial HVAC service in Rancho Cucamonga, including maintenance, repairs, installations and system restoration. Its restoration service targets common failure points to help extend an existing system’s life.

Last Updated October 2, 2026.

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Business Highlights

Reliant HVAC says it is licensed, bonded and insured.
Financing is available for repairs, replacements and new system installations.
Technicians receive specialized, ongoing training.
It says costs, included work and options are explained before work begins.

Service Area

Rancho Cucamonga, Fontana, Ontario, Upland, San Antonio Heights, Alta Loma, Norco, Bloomington, Rialto, Colton, Claremont, La Verne, San Dimas, Glendora, Azusa, Covina, Charter Oak, San Bernardino, Jurupa Valley, Chino, Chino Hills, Walnut, Rowland Heights, Hacienda Heights, City of Industry, West Covina, Baldwin Park, Riverside, Redlands, Montclair, Pomona, Monrovia, Duarte, Arcadia, Sierra Madre, San Marino, Alhambra, Monterey Park, Montebello and Whittier; LA County, the San Gabriel Valley, San Bernardino County and Riverside County.

Active Business Listing

Reliant HVAC Service LLC is one of 10 HVAC companies ProsGrade lists in Rancho Cucamonga, California.

Active

Public local listing

Listing details

7 services listed, including AC maintenance, AC repair and Heating maintenance. Open Monday to Saturday. Rated 5.0 from 16 reviews.

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Published local profile

How This Business Compares

How Reliant HVAC Service LLC compares with the other 9 HVAC companies on ProsGrade in Rancho Cucamonga, using public Google ratings and review counts.

Ranks in the top half of the 10 Rancho Cucamonga HVAC companies on ProsGrade by Google rating and review volume.
Rated 5.0 on Google, at or above the 4.8 average of other Rancho Cucamonga HVAC companies on ProsGrade.
One of 7 Rancho Cucamonga HVAC companies on ProsGrade rated 4.7 or higher from at least 10 reviews.

Services Covered

7 services

AC maintenance10-point cooling inspection.
AC repair
Heating maintenance13-point inspection.
Heating repair
New AC installationSplit systems, rooftop package units and multi-zone ductless systems.
New heater installationFurnaces, air handlers, heat pumps and wall heaters.
System restorationReplacement of common failure points to help extend system life.

Reviews

What customers say

Customers praise Mark’s punctuality and courtesy, and several appreciated clear explanations of system issues and options. One customer valued an A/C maintenance visit that included a starter replacement; another said a loose furnace door was causing the system to shut off.

Customer Reviews

Alex Castillo

From the get go Mark was punctual attentive and courteous. He really made me feel like he was taking care of me. I’ve had horrible experiences with other hvac companies but Reliant HVAC is really top notch. Mark was very honest with me and let me know the condition of my system and what it would take to repair and the expectations for the repair and he WAS VERY CLEAN. He never made me feel pressured. I am definitely recommending Reliant HVAC to friends and family.

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Alberto Sandoval

I recently had A/C maintenance done, including a starter replacement, and I’m very happy with the service. He was professional, knowledgeable, and took the time to explain what needed to be done. The work was completed efficiently, and everything has been running smoothly since. He was punctual, respectful of the space, and made sure everything was cleaned up before leaving. It’s clear he takes pride in his work and cares about doing the job right. I would definitely recommend him to anyone needing reliable and honest HVAC service.

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Rocio Tan

Mark came out and helped get our system up and running.He was very Honest and Straightforward by informing us that the furnace door was loose and that causes the system to shut off. We will definitely be calling RELIANT HVAC Service again when needed in the future ! Their efficiency and GREAT SERVICE it’s OUTSTANDING !!????

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Manuel Garcia

I recently had Reliant HVAC Service Company come out to my home to improve the airflow, and I couldn’t be happier with the results. From start to finish, the experience was excellent. Mark, the technician, was outstanding. He was very knowledgeable and took the time to clearly explain what was causing the airflow issues and what options were available. What I appreciated most was his honesty. He didn’t try to upsell anything unnecessary and focused on what would actually make a difference for my home. He arrived right on time, was professional throughout the visit, and completed the work efficiently. The pricing was also very fair, especially considering the quality of the work and the improvement I’ve already noticed. Overall, I highly recommend Reliant HVAC Service Company. If you get the chance to work with Mark, you’ll be in great hands.

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An Duong

Mark came for a system replacement consultation and I was amazed by how knowledgeable he is at such a young age. He told me everything from why my system had so much issues to how I can remedy it. He didn’t push for a new unit from the get go and explained how my existing unit can be restored to 100 percent efficiency. He compared the cost to restore vs replace and I was very impressed with the integrity this company stands for and I will definitely be choosing Mark from Reliant HVAC Service!

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Frequently Asked Questions

Does Reliant HVAC include a replacement filter with AC maintenance?

The AC-maintenance checklist lists filter replacement, but the filter is not included.

What does Reliant HVAC check during heating maintenance?

The checklist includes a full start-up and run test before and after maintenance, a heat-exchanger inspection, and a carbon monoxide and combustion-safety check.