Compare Local Pros
Corda Solar vs Hassler Heating And Air Conditioning
Contra Costa Electrical Contractors Comparison · Updated March 2026
These contractors serve completely different needs—Corda Solar installs solar panels and batteries while Hassler specializes in heating and air conditioning systems.
| Corda Solar | Hassler Heating And Air Conditioning | |
|---|---|---|
| Rating | ★ 5.0 | ★ 4.9 |
| Years Licensed | 9 years | 26 years |
| License # | 1019424 | 770180 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Danville, CA | El Cerrito, CA |
| Website | www.cordasolar.com | www.hasslerheating.com |
Key Differences
What Customers Say
Corda Solar
Customers emphasize Corda Solar's ability to handle complex solar configurations and specialized roofing requirements with competitive pricing and seamless project coordination.
Hassler Heating And Air Conditioning
Customers consistently highlight Hassler's thorough diagnostic approach with photo documentation, detailed technical explanations, and responsive scheduling for both emergencies and planned replacements.
Key Takeaway: Corda Solar's feedback centers on installation expertise and project complexity handling, while Hassler's reviews emphasize diagnostic thoroughness and educational communication about system conditions.
Customer Reviews
Corda Solar
We recently had two Tesla Powerwall 3 units installed by Corda Solar in Danville, and we couldn’t be happier with the entire experience! From start to finish, everything went seamlessly, with no sur...
Great company to do business with. Nathan and his team of installers were very knowledgeable and answered any questions I had. They are local here in Danville Ca. and could not have done a better jo...
Got solar 8 years ago. Same people in business. Returns phone call and emails.
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 Corda Solar if...
- ✓ You're installing solar panels or adding battery storage like Tesla Powerwall to your home
- ✓ Your project involves complex roofing situations or multi-module solar configurations requiring specialized mounting experience
- ✓ You want a locally-based Danville contractor for ongoing solar system support and warranty service
- ✓ You're prioritizing solar-specific expertise over general contracting experience
Consider Hassler Heating And Air Conditioning if...
- ✓ You need heating or air conditioning installation, repair, or replacement services
- ✓ Your project involves ductwork, heat pump conversion, furnace replacement, or HVAC system diagnostics
- ✓ You value the institutional knowledge that comes from 26 years navigating HVAC code changes and equipment evolution
- ✓ You need emergency heating or cooling repairs with responsive scheduling
Questions to Ask Before Hiring
- → If considering both for a home electrification project: Ask each contractor how they coordinate with other trades and whether they recommend specific sequencing for solar and HVAC upgrades
- → For solar projects: Ask Corda Solar about their experience with your specific roof type and panel configuration requirements
- → For HVAC projects: Ask Hassler about their diagnostic process and what documentation they provide before recommending system replacements
The Bottom Line
This comparison only makes sense if you're planning separate solar and HVAC projects. Contact Corda Solar for any photovoltaic panel installation, battery storage, or solar-related work—their nine years of focused experience and track record with complex installations make them appropriate for residential solar projects. Contact Hassler Heating And Air Conditioning for furnace, air conditioner, heat pump, or ductwork needs—their 26 years of HVAC specialization provides the depth required for heating and cooling systems. Both maintain proper licensing and insurance. If you're planning comprehensive home energy upgrades involving both trades, you'll need to hire and coordinate both contractors separately.
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Frequently Asked Questions
Each contractor would handle their specialty portion, but neither appears to offer turnkey electrification project management. You would need to coordinate separately with Corda Solar for the solar installation and Hassler for the heat pump or HVAC work. Ask each contractor if they have preferred partners in the other trade or experience coordinating timing with complementary projects.
The experience difference is less relevant than the trade specialization. Corda Solar's nine years focused exclusively on solar provides appropriate depth for photovoltaic projects, while Hassler's 26 years in HVAC reflects veteran-level expertise in heating and cooling. Within their respective trades, both demonstrate sufficient experience to handle complex residential projects.
Generally, HVAC efficiency improvements should precede solar installation so you can right-size your solar array based on reduced energy consumption. A more efficient heat pump or furnace will lower your electricity needs, potentially reducing the number of solar panels required. Ask both contractors for their perspective on sequencing based on your specific equipment and home conditions.
Hassler explicitly offers annual HVAC maintenance programs and responds to service calls for existing systems. Corda Solar's local presence in Danville and customer feedback about post-installation support suggests ongoing availability, though you should confirm their specific warranty service terms and maintenance offerings for solar systems.
Looking for the Best?
See our ranked list of top electrical contractors in Contra Costa.
Other Contra Costa Electrical Contractors Comparisons
Diablo Solar Services
★ 4.2
Hassler Heating And Air Conditioning
★ 4.9
Got Watts?
★ 4.9
Hassler Heating And Air Conditioning
★ 4.9
West Coast Solar
★ 4.3
Hassler Heating And Air Conditioning
★ 4.9
Solar Technologies
★ 4.5
Hassler Heating And Air Conditioning
★ 4.9
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 12, 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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