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Northstar Solar vs Hassler Heating And Air Conditioning
Contra Costa General Contractors Comparison · Updated March 2026
These contractors serve completely different needs—Northstar Solar installs solar panels while Hassler provides heating and air conditioning services.
| Northstar Solar | Hassler Heating And Air Conditioning | |
|---|---|---|
| Rating | ★ 4.7 | ★ 4.9 |
| Years Licensed | 10 years | 26 years |
| License # | 1006316 | 770180 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Danville, CA | El Cerrito, CA |
| Website | www.gonorthstarsolar.com | www.hasslerheating.com |
Key Differences
What Customers Say
Northstar Solar
Customers consistently praise Northstar's detailed energy consultations and transparent communication throughout the solar installation process, with particular appreciation for how they handle complex permitting and utility coordination.
Hassler Heating And Air Conditioning
Hassler receives strong feedback for thorough diagnostic inspections with photo documentation, technical explanations of system conditions, and responsive scheduling for both emergency repairs and planned replacements.
Key Takeaway: Both companies emphasize detailed explanations and communication, but Northstar's feedback centers on upfront consultation and system design guidance, while Hassler's reviews focus on diagnostic thoroughness and technical problem-solving during service calls.
Customer Reviews
Northstar Solar
I never write reviews, but NorthStar Solar truly earned it. After soliciting multiple bids, Patrick stood out right away - he took the time to do a Zoom call to understand my property and my goals ins...
I had a great experience with my solar and battery installation. The team was very knowledgeable and responsive. The whole installation was very fast from start to finish.
I had a solar system installed by Northstar Solar this past winter, and I am thoroughly impressed with their service. I obtained several bids from different companies, Northstar Solar's bid stood out ...
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 Northstar Solar if...
- ✓ You're installing solar panels, adding battery storage, or need panels removed and reinstalled for roof replacement projects
- ✓ You want detailed consultation on system sizing based on your actual energy usage patterns and future consumption goals
- ✓ You need a contractor experienced with utility interconnection processes, net metering agreements, and solar-specific permitting in Contra Costa County
- ✓ You're comparing multiple solar equipment options and want guidance on panel brands and battery systems that fit your budget
Consider Hassler Heating And Air Conditioning if...
- ✓ You need heating or cooling system installation, repair, or maintenance services for your home
- ✓ Your furnace, heat pump, or air conditioner has failed and you need emergency HVAC service with quick scheduling
- ✓ You're planning whole-home electrification and need to replace gas heating with electric heat pumps or install new ductwork
- ✓ You want thorough diagnostic inspections with photo documentation explaining what's wrong with your existing HVAC system and what maintenance is recommended
Questions to Ask Before Hiring
- → If planning home electrification with both solar and heat pump installation, ask each contractor about typical project sequencing and whether electrical panel upgrades should happen before or between installations
- → Ask Northstar Solar specifically about their experience coordinating with roofing contractors if your roof may need work before solar installation
- → Ask Hassler about their experience sizing heat pumps for homes that will have solar power, as heating load calculations may differ when energy costs change
The Bottom Line
This comparison only makes sense if you're planning comprehensive home upgrades involving both solar installation and HVAC system replacement or electrification. Both contractors demonstrate strong credentials within their specialties—Northstar for solar panels and battery storage, Hassler for heating and cooling systems. Choose Northstar if you need solar-related services, choose Hassler if you need HVAC work, and plan to use both if you're electrifying your home with solar panels plus heat pump heating. If doing both projects, install the heat pump first so your solar system can be sized correctly for your electrified energy consumption, then coordinate timing so any necessary electrical panel upgrades happen efficiently between projects.
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Frequently Asked Questions
No, these require separate specialized licenses and expertise. Solar installation involves electrical work, utility coordination, and renewable energy system design, while HVAC requires expertise in heating and cooling loads, ductwork, and climate control systems. You'll need both contractors if you're doing comprehensive home electrification.
Generally solar should come after HVAC upgrades, because switching from gas heat to an electric heat pump increases your electrical consumption, which affects solar system sizing. Install the heat pump first so Northstar can design a solar array that accounts for your actual electrified energy usage. Both contractors can advise on sequencing for your specific situation.
The 16-year experience difference reflects how long each has operated in their respective trades, not relative reliability. Hassler's 26 years in HVAC and Northstar's 10 years in solar both represent substantial experience within their specialties. Customer feedback shows both companies deliver professional work with strong communication—the experience gap matters less than choosing the right specialist for your project type.
Yes, both contractors understand local permitting requirements, utility providers, and regional building codes specific to Contra Costa County. Northstar knows PG&E's solar interconnection process, while Hassler understands local HVAC permitting and inspection requirements. Local presence also means faster response times for service calls or warranty work.
Looking for the Best?
See our ranked list of top general contractors in Contra Costa.
Other Contra Costa General Contractors Comparisons
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Bay Valley Roofing & Solar
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High Definition Solar
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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 11, 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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