Onyx Heating and Air

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About Onyx Heating and Air
Onyx Heating and Air serves Middleburg, Florida and surrounding Clay County communities as a fully licensed HVAC contractor with a perfect 5-star rating earned across 48 verified customer reviews. The company maintains extended service hours seven days a week, with technicians available starting at 7 AM on weekdays and Saturday coverage from 8 AM to 5 PM. This family-rooted business has built its reputation on transparent diagnostics and honest assessments, explaining every repair need in detail before recommending work.
Without access to the company website, details about specific brand partnerships or specialized equipment certifications remain unavailable. However, review accounts consistently describe Onyx as providing comprehensive solutions, from complete system replacements to component-level repairs. Their willingness to explain technical findings to homeowners reflects a commitment to customer education that many competitors overlook.
Customer stories from review accounts spotlight the team's dedication. Nicolas handled a new air conditioner installation at Happy Stars Academy preschool, working evening hours to avoid disrupting children's daily activities, a level of scheduling flexibility uncommon in the trade. Justin Redding resolved a two-unit situation, replacing a downstairs system while simultaneously adapting a recovered fan component to fix an unrelated upstairs condenser. Lee Morin described how the team expedited a compressor replacement by picking up parts before warranty approval cleared, eliminating delays for a newly purchased home. These narratives illustrate a service approach prioritizing resolution over procedural convenience.
What Customers Say
Every reviewer awarded a 5-star rating, with all accounts praising the team's technical skill and communication style. Multiple reviewers describe receiving detailed explanations of diagnosed problems, unusual in a tradesperson industry often criticized for opaque recommendations. Emergency response appears in at least two accounts, including weekend calls and time-sensitive situations involving recent home purchases.
Working Hours
| Sunday | Closed |
| Monday | 7 AM–10:30 PM |
| Tuesday | 7 AM–10 PM |
| Wednesday | 7 AM–10 PM |
| Thursday | 7 AM–10 PM |
| FridayToday | 9 AM–10 PM |
| Saturday | 8 AM–5 PM |
Services
Complete HVAC System Replacement
Full unit replacement when repair costs exceed practical thresholds, including 25-year-unit swaps and new construction installations.
AC Repair & Component Service
Diagnostic troubleshooting and repair for compressor failures, capacitor issues, fan malfunctions, and refrigerant concerns.
Preventive Maintenance
System tune-ups and inspection services designed to extend equipment lifespan and maintain efficiency.
Commercial HVAC Installation
Specialized installation services for business properties, including scheduling flexibility for operational continuity.
Emergency Same-Day Service
Rapid-response appointments for urgent climate control failures, including weekend availability for critical situations.