Compare Local Pros
Synergy 768 vs Hassler Heating And Air Conditioning
Contra Costa Electrical Contractors Comparison · Updated March 2026
You're comparing a solar and electrical specialist to a veteran HVAC contractor, so your choice depends entirely on whether you need solar panels or climate control systems.
| Synergy 768 | Hassler Heating And Air Conditioning | |
|---|---|---|
| Rating | ★ 4.3 | ★ 4.9 |
| Years Licensed | 12 years | 26 years |
| License # | 994847 | 770180 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Brentwood, CA | El Cerrito, CA |
| Website | synergy768.com | www.hasslerheating.com |
Key Differences
What Customers Say
Synergy 768
Customers consistently mention on-schedule project completion, owner accessibility for questions, and successful coordination of solar permitting and utility interconnection.
Hassler Heating And Air Conditioning
Customers repeatedly highlight thorough diagnostic processes with photo documentation, detailed technical explanations from technicians, and responsive scheduling for both emergencies and planned installations.
Key Takeaway: Synergy feedback centers on project management and owner involvement for scheduled installations, while Hassler feedback emphasizes systematic inspection processes and diagnostic communication across both emergency and planned service calls.
Customer Reviews
Synergy 768
Synergy 768 executed a very nice design for an expansion of our existing solar/battery system. Other companies had expressed doubt that the system could be expanded. After the plans were approved, the...
Ed Cotas and the Synergy 768 team performed professionally and punctually in installing the solar panel system at our home. They have been ready and available to answer any questions we have had. I w...
Synergy did a great job with a complicated ground mount solar system for me. They took care of everything including permits, PG&E, batteries and training !
Hassler Heating And Air Conditioning
We had Hassler Heating & Air replace the ductwork under our house, and the experience was excellent from start to finish. The team was professional, punctual, and clearly knew what they were doing. Th...
Friendly, intelligent service. Thoroughly checked my heating system and showed in great detail what the problems are. The technician provided detailed inspection and we both agreed that it will be nec...
The crew was professional and courteous while being in my home which was very appreciated. Larry in particular was kind enough to answer my many questions to ensure I understood my new system so that ...
Consider Synergy 768 if...
- ✓ You're installing solar panels, battery backup systems, or EV charging stations and need a contractor focused exclusively on these renewable energy projects.
- ✓ You value direct owner involvement throughout the project, from initial consultation through installation completion and utility coordination.
- ✓ Your project involves solar permitting, PG&E interconnection, and equipment upgrades as an integrated electrical and solar installation.
- ✓ You're planning multiple related projects over time, as several customers returned to Synergy for additional solar or electrical work on their properties.
Consider Hassler Heating And Air Conditioning if...
- ✓ You need furnace replacement, air conditioning installation, heat pump conversion, ductwork replacement, or any heating and cooling system work.
- ✓ Your situation involves diagnosing complex HVAC problems where 26 years of troubleshooting experience across multiple equipment generations matters.
- ✓ You want thorough system inspections with photo documentation and detailed explanations of findings before committing to repairs or replacements.
- ✓ You need emergency heating or cooling service with responsive scheduling, as multiple customers mentioned quick response during system failures.
Questions to Ask Before Hiring
- → For Synergy: Ask specifically about the timeline for completing rebate paperwork and who handles follow-up with utility companies after installation, given customer feedback on administrative processes.
- → For Hassler: Ask whether the specific technician diagnosing your system will be the same person performing the installation or repair work.
- → Ask both companies for references from projects completed in the past six months that match your specific project type and scope.
The Bottom Line
Your decision should be straightforward: choose Synergy 768 if you're installing solar panels, battery storage, or EV charging equipment, and choose Hassler Heating And Air Conditioning if you need heating, cooling, or ventilation work. These companies don't compete because they serve completely different needs. Synergy offers established solar expertise with hands-on owner involvement, though you should clarify administrative processes upfront. Hassler brings veteran HVAC experience with thorough diagnostic practices and responsive emergency service. If you're planning whole-home electrification involving both specialties, prepare to coordinate between contractors or ask each if they work with partners in the other trade.
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Frequently Asked Questions
You would likely need both contractors. Hassler can install heat pumps and electric HVAC systems, while Synergy handles the solar panels and electrical infrastructure to power them. Ask each company if they coordinate with other specialists on integrated projects, or if you'll need to manage the scheduling between trades yourself.
It matters primarily for HVAC complexity and troubleshooting. Hassler's 26 years means they've worked on multiple generations of furnaces and heat pumps, including legacy systems that may be difficult to diagnose. For solar installations, which have become standardized more recently, Synergy's 12 years covers the modern solar industry adequately.
Hassler clearly operates with emergency HVAC service as part of their business model, with customer feedback mentioning quick response during heating failures. Synergy focuses on scheduled installation projects for solar and EV charging, not emergency electrical calls. If you need emergency service, Hassler is structured for that work.
Synergy customers highlight direct access to the owner for project questions and decision-making, which some homeowners prefer for major investments like solar. Hassler customers emphasize systematic communication from technicians who document findings with photos and provide detailed technical explanations. Both approaches work, but reflect different operational models.
Looking for the Best?
See our ranked list of top electrical contractors in Contra Costa.
Other Contra Costa Electrical Contractors Comparisons
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West Coast Solar
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Solar Technologies
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Hassler Heating And Air Conditioning
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How We Compare Contractors
License Verification
All license data is sourced from official California CSLB records and verified regularly.
Review Analysis
Customer reviews are aggregated from Google and analyzed to identify patterns in service quality.
Detailed Comparison
We analyze credentials, insurance, experience, and feedback to highlight meaningful differences.
Not all licensed contractors are created equal. While a valid license is the baseline requirement in California, contractors can vary significantly in experience, insurance coverage, and customer satisfaction.
- Experience matters: A contractor with 15+ years of experience has likely encountered and solved problems that newer contractors haven't faced yet.
- Workers' compensation protects you: If a contractor without workers' comp insurance has an employee injured on your property, you could be held liable.
- Reviews reveal patterns: Individual reviews can be misleading, but patterns across many reviews often reveal a contractor's true strengths and weaknesses.
- Bond amounts vary: A contractor's bond provides financial protection if they fail to complete work as agreed. Higher bonds offer more protection.
Taking time to compare contractors on these factors can save you from costly mistakes and help ensure your project is completed by a qualified professional.
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified March 08, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.
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