Compare Local Pros
Synergy 768 vs Hassler Heating And Air Conditioning
Contra Costa General Contractors Comparison · Updated March 2026
These contractors serve completely different needs: Synergy 768 specializes in solar and EV charging, while Hassler focuses exclusively on heating and cooling 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 emphasize on-schedule solar project completion, owner accessibility for technical explanations, and successful coordination of permitting and utility processes.
Hassler Heating And Air Conditioning
Customers highlight thorough HVAC diagnostics with photo documentation, detailed explanations of system findings, and responsive scheduling for both emergency repairs and planned replacements.
Key Takeaway: Synergy 768 feedback centers on project management for complex solar installations, while Hassler feedback emphasizes diagnostic precision and communication during HVAC service work—reflecting their fundamentally different trade specializations.
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 need solar panel installation, battery storage systems, or EV charging station setup and want a contractor experienced in utility coordination and solar permitting processes.
- ✓ Your project involves electrical infrastructure upgrades related to energy systems, and you value direct owner involvement in technical consultations and project planning.
- ✓ You're planning multiple related projects over time, as customers mention returning to Synergy 768 for additional solar or EV charging work.
Consider Hassler Heating And Air Conditioning if...
- ✓ Your project involves heating or cooling systems—furnace replacement, heat pump installation, ductwork, air conditioning, or water heater service.
- ✓ You need thorough diagnostic work for existing HVAC systems, with detailed explanations and photo documentation of findings and recommendations.
- ✓ You value deep specialty experience, as Hassler's 26 years focused exclusively on HVAC means extensive exposure to system complications and equipment evolution.
- ✓ You need responsive emergency service for heating failures, as customers mention quick scheduling during system breakdowns.
Questions to Ask Before Hiring
- → If your project involves both HVAC and solar work, ask each contractor whether they coordinate with other trades and if they have preferred partners for the complementary work.
- → For heat pump installations that might benefit from solar power, ask Hassler about electrical requirements and whether panel upgrades are needed, then confirm Synergy 768 can handle that scope.
- → Ask each contractor for references from projects similar to yours in complexity and scope, particularly if you're combining multiple systems.
The Bottom Line
This comparison requires clarity on your actual project scope. If you need solar panels, battery storage, or EV charging infrastructure, Synergy 768 is the relevant contractor with established experience in these systems. If you need furnace replacement, heat pump installation, air conditioning, or ductwork, Hassler is the specialist with veteran-level HVAC expertise. Both are properly licensed, insured, and bonded. For comprehensive home electrification projects combining heat pumps and solar, you'll likely need both contractors handling their respective specialties, which means coordinating two separate contracts and ensuring electrical capacity supports both systems.
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Frequently Asked Questions
Not individually. Hassler specializes in HVAC systems including heat pumps but doesn't install solar panels. Synergy 768 handles solar and electrical work but doesn't specialize in HVAC installation. For comprehensive electrification, you would likely need both contractors working on their respective specialties, which requires coordination on your part or asking if they work with partner companies.
This depends entirely on your project type. For solar panels, battery storage, or EV chargers, Synergy 768's 12 years of focused experience in these systems is directly relevant. For furnaces, heat pumps, air conditioning, or ductwork, Hassler's 26 years of HVAC-specific experience is what matters. Neither contractor's general tenure is meaningful if they don't actually perform the work you need.
While air conditioning installation appears in Synergy 768's project list, their primary focus and customer feedback centers heavily on solar and EV charging work. If you need standalone AC installation without solar components, Hassler's 26 years of dedicated HVAC experience would be more directly aligned. Ask Synergy 768 specifically about their AC installation experience and crew expertise if that's your primary need.
This is a strategic question about your home's overall energy efficiency, not a contractor comparison. Solar panels generate power while HVAC systems consume it, so an efficient heat pump paired with solar can maximize your investment. However, these are separate decisions requiring different specialists. Ask Synergy 768 about your electrical panel capacity for both systems, and ask Hassler whether your current HVAC efficiency would benefit from replacement before adding solar.
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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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