Compare Local Pros
Citadel Roofing And Solar vs Greiner Heating Air And Electric
Solano Electrical Contractors Comparison · Updated March 2026
These veteran contractors serve completely different trades—Citadel specializes in solar and roofing, while Greiner handles HVAC and electrical work.
| Citadel Roofing And Solar | Greiner Heating Air And Electric | |
|---|---|---|
| Rating | ★ 4.7 | ★ 5.0 |
| Years Licensed | 34 years | 47 years |
| License # | 647149 | 365955 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Vacaville, CA | Dixon, CA |
| Website | www.citadelrs.com | www.ghac.com |
Key Differences
What Customers Say
Citadel Roofing And Solar
Customers consistently praise Citadel for resolving complex solar system problems that other contractors couldn't diagnose, with particular emphasis on technical expertise and clear explanations of solar technology.
Greiner Heating Air And Electric
Customers regularly highlight Greiner's thorough HVAC inspections with detailed photographic documentation, same-day emergency response, and professional treatment of properties during service visits.
Key Takeaway: Citadel's reviews emphasize problem-solving capability for malfunctioning equipment, while Greiner's reviews focus on preventive maintenance thoroughness and rapid response times for urgent failures.
Customer Reviews
Citadel Roofing And Solar
My technician Tyler Jones was on time and very respectful. He explained what he was doing to connect my solar to wifi and how to log into the app to monitor my solar connectivity. Thank you for your...
I had 2 solar panel micro inverters fail and needed the warranty parts replaced. Tyler communicated when he would arrive and went over and above sending me pictures of the cracked tiles on my roof tha...
Ask for Tyler Jones he was my service Tech. He was very helpful and informative. Took time to help me understand the App and how all the solar process works. Thank you.
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...
Consider Citadel Roofing And Solar if...
- ✓ You need solar panel installation, repair, or diagnostic work on an existing system that's malfunctioning or underperforming
- ✓ Your project involves battery backup systems like Powerwall or other energy storage integration with solar panels
- ✓ You need roofing work, whether as part of a solar installation or as a standalone roof replacement or repair project
- ✓ Your solar system was installed by another company and you're experiencing ongoing issues with inverters, microconverters, or connectivity that haven't been resolved
Consider Greiner Heating Air And Electric if...
- ✓ You need heating or air conditioning installation, repair, or maintenance, particularly if you're facing an urgent system failure
- ✓ Your project involves electrical work, including panel upgrades, circuit work, or electrical components of HVAC installations
- ✓ You want to establish a long-term maintenance relationship with bi-annual service visits and priority scheduling for your HVAC system
- ✓ You need same-day or emergency response for heating or cooling problems, which Greiner's reviews consistently mention providing
Questions to Ask Before Hiring
- → If you have both solar and HVAC needs, ask each company whether they recommend coordinating projects or if one should precede the other for optimal system performance
- → Ask Citadel specifically about their experience integrating solar systems with your existing electrical panel capacity and whether electrical upgrades might be needed
- → Ask Greiner about their experience working around existing solar installations if you need HVAC work on a home with roof-mounted panels
- → Confirm which company would handle electrical permit requirements if your project involves both solar electrical work and HVAC electrical connections
The Bottom Line
This isn't a competitive comparison—you're looking at two contractors who work in completely different trades. Call Citadel Roofing And Solar for anything related to solar panels, battery storage, inverters, or roofing work. Call Greiner Heating Air And Electric for furnaces, air conditioners, heat pumps, or electrical projects. Both are veteran contractors with strong credentials and positive customer feedback in their specialties. If you have projects in both categories, you'll likely need both companies. The only decision point is understanding which trade category your specific project falls under, then contacting the appropriate specialist.
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Frequently Asked Questions
No, these companies specialize in different trades. Citadel handles solar and roofing but not HVAC systems, while Greiner handles HVAC and electrical but not solar installations. You would need to hire both contractors if you have projects in both categories, though Greiner could potentially handle the electrical panel work related to solar if coordination is needed.
You'll need both companies—call Citadel for the solar panel issues and Greiner for the air conditioner problems. These are completely separate systems requiring different specialized knowledge, and neither contractor crosses into the other's trade specialty.
Not in this comparison, because the experience is in different fields entirely. Greiner's 47 years are in HVAC and electrical work, while Citadel's 34 years focus on solar and roofing. Both have veteran-level experience in their respective specialties, which is what matters for quality and problem-solving capability.
This is worth asking both contractors directly. An aging, inefficient HVAC system will increase your solar panel size requirements and costs, so Greiner could assess whether replacement makes sense before Citadel designs your solar system. Coordinating these projects could optimize your overall energy efficiency and solar investment.
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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 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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