Compare Local Pros
Greiner Heating Air And Electric vs Sun Marshall Solar Services
Solano Solar Contractors Comparison · Updated March 2026
These contractors serve entirely different needs—one specializes in HVAC and electrical work, the other exclusively handles solar installations.
| Greiner Heating Air And Electric | Sun Marshall Solar Services | |
|---|---|---|
| Rating | ★ 5.0 | ★ 5.0 |
| Years Licensed | 47 years | 15 years |
| License # | 365955 | 952018 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Dixon, CA | Vallejo, CA |
| Website | www.ghac.com | sunmarshall.com |
Key Differences
What Customers Say
Greiner Heating Air And Electric
Customers consistently highlight Greiner's thorough inspections with detailed photo documentation, same-day emergency response, and technicians who explain findings without pressuring unnecessary purchases.
Key Takeaway: Greiner has substantial customer feedback documenting service patterns, while Sun Marshall's limited review history requires homeowners to request references directly to assess their work quality and communication.
Customer Reviews
Greiner Heating Air And Electric
Very professional and kind techs...big reason I stay with the monthly subscription are techs like Jose who are super professional and explain everything thoroughly without pressuring.
This is the best experience I've ever had with a tradesmen coming to do Home repairs. The technician Jason did a thorough inspection. He took the time to explain to me what he did and what might be ne...
I recommend using Greiner. They have given me wonderful service over the years. From the friendly receptionist who has a very kind demeanor every time I've called. And the technicians provided me wi...
Sun Marshall Solar Services
No reviews available
Consider Greiner Heating Air And Electric if...
- ✓ You need HVAC installation, repair, or maintenance services including furnaces, air conditioners, heat pumps, or ductwork
- ✓ You value documented customer feedback showing responsive service, with multiple reviews mentioning same-day appointments for urgent issues
- ✓ You want a maintenance program with scheduled bi-annual service visits and priority response times
- ✓ Your project involves electrical work alongside or instead of heating and cooling systems
Consider Sun Marshall Solar Services if...
- ✓ You're specifically installing a solar panel system for your home or business
- ✓ You want a contractor with 15 years navigating California's solar regulations, incentive programs, and utility interconnection requirements
- ✓ You're comfortable requesting customer references directly given the limited public review history
- ✓ Your property is in Vallejo or nearby areas where Sun Marshall has concentrated their solar installation experience
Questions to Ask Before Hiring
- → For Sun Marshall: Ask for at least three references from solar installations completed in the past year, and inquire about their typical project timeline from permit application to final inspection
- → For Sun Marshall: Ask about their warranty terms for both equipment and installation labor, and who handles service if issues arise after installation
- → For either company: Confirm their current availability and whether your project timeline aligns with their scheduling
The Bottom Line
This comparison only makes sense if you've misidentified your project need. If you need heating, cooling, or electrical work, Greiner is the clear choice with 47 years of experience and extensive positive feedback showing responsive, professional service. If you're installing solar panels, Sun Marshall is your option with 15 years of solar-specific expertise, though you should request customer references given their limited public reviews. Both companies maintain proper licensing and protections. Clarify whether your project is HVAC/electrical or solar, then move forward with the appropriate contractor—there's no meaningful overlap between what these companies actually do.
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Frequently Asked Questions
No, Greiner specializes in HVAC systems and electrical work, not solar installations. While they handle electrical components, solar panel systems require specific licensing and experience that Sun Marshall holds. If you need both HVAC upgrades and solar installation, you'll need separate contractors.
No, because they work in different trades. Fifteen years in solar installation represents veteran-level expertise in that specialized field, including experience with multiple technology generations and regulatory changes. Greiner's 47 years reflects deep HVAC and electrical knowledge. Both time frames indicate competence within their respective specialties.
Solar installations are less frequent projects than HVAC service calls, which naturally generates fewer reviews. However, the lack of public feedback does mean you should request references directly from Sun Marshall before hiring. Ask for contacts from recent installations similar to what you're planning.
Yes, both carry identical financial protections: $25,000 bonds and active workers compensation insurance. This means if either company fails to complete contracted work, you have bond protection, and if workers are injured on your property, their workers comp covers it rather than your homeowner's insurance.
Looking for the Best?
See our ranked list of top solar contractors in Solano.
Other Solano Solar Contractors Comparisons
Citadel Roofing And Solar
★ 4.7
Greiner Heating Air And Electric
★ 5.0
Greiner Heating Air And Electric
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Right Now Air And Solar
★ 4.9
Element Electric
★ 5.0
Greiner Heating Air And Electric
★ 5.0
Citadel Roofing And Solar
★ 4.7
Sun Marshall Solar Services
★ 5.0
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 13, 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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