Reliant HVAC Service LLC
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About Reliant HVAC Service LLC
Reliant HVAC Service LLC operates in Rancho Cucamonga, California, delivering heating and cooling solutions to residential clients across the Inland Empire. With a perfect 5.0-star rating from 16 verified reviews, the contractor has built a reputation for transparent diagnostics and fair pricing. Serving Rancho Cucamonga and surrounding cities including Ontario, Fontana, and Upland, the company maintains convenient weekday hours from 7 AM to 6 PM Monday through Saturday.
What distinguishes Reliant HVAC is their commitment to restore existing systems when cost-effective, rather than automatically recommending full replacements. The company offers system restoration services that compare repair versus replacement costs, empowering homeowners to make informed decisions. Financing options help manage unexpected expenses, while their focus on honest diagnostics means clients only pay for work that addresses their specific problem.
Multiple reviewers highlight Mark as the technician delivering this experience. Manuel Garcia praised Mark for improving airflow without unnecessary upsells, while An Duong noted how Mark explained why her system could be restored to full efficiency rather than forcing a new unit purchase. Alberto Sandoval scheduled maintenance including a starter replacement and found Mark punctual and thorough. Alex Castillo described Mark as honest about system condition and repair expectations, with careful cleanup after the work.
What Customers Say
All 16 reviewers award 5 stars, with Mark named as the technician in every detailed review. Customers consistently praise honest diagnostics, punctual arrival, and clean work with no pressure for unnecessary replacements. Pricing fairness appears across multiple reviews.
Working Hours
| Sunday | Closed |
| MondayToday | 7 AM–6 PM |
| Tuesday | 7 AM–6 PM |
| Wednesday | 7 AM–6 PM |
| Thursday | 7 AM–6 PM |
| Friday | 7 AM–6 PM |
| Saturday | 7 AM–6 PM |
Services
AC Maintenance
Tune-ups include filter replacement, coil cleaning, refrigerant inspection, and performance testing for optimal cooling.
AC Repair
Diagnostics for refrigerant leaks, compressor issues, and electrical faults with transparent cost explanations before work begins.
Heating Maintenance
Annual furnace inspections covering burners, heat exchangers, ignition systems, and safety controls for reliable warmth.
Heating Repair
Furnace and heat pump repairs restore heating function safely, with emphasis on proper cleanup after service.
New AC Installation
Professional installation of cooling systems with post-install support and financing options for qualified homeowners.
New Heater Installation
Heating system installation including load calculations, proper sizing, and equipment recommendations for home efficiency.
System Restoration
Cost comparison between repairing existing units versus replacement, helping homeowners choose financially sound options.