Compare Local Pros
Citadel Roofing And Solar vs Greiner Heating Air And Electric
Solano Solar Contractors Comparison · Updated March 2026
These are veteran contractors serving completely different trades—Citadel specializes in roofing and solar while Greiner focuses exclusively on 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 highlight Citadel's ability to diagnose and resolve complex solar system problems that other contractors failed to fix, often after months of unsuccessful troubleshooting attempts.
Greiner Heating Air And Electric
Customers regularly praise Greiner's same-day emergency response capability and thorough maintenance inspections with detailed photo documentation and explanations.
Key Takeaway: Citadel's reviews emphasize technical problem-solving expertise for malfunctioning systems, while Greiner's feedback focuses on rapid response times and preventive maintenance program benefits.
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're planning a solar panel installation, battery backup system like Powerwall, or need roofing work done separately or integrated with solar
- ✓ Your existing solar system has performance issues, inverter failures, or connectivity problems that need expert diagnostics
- ✓ You want a contractor who services equipment from multiple manufacturers and can handle warranty work for systems installed by others
- ✓ Your project spans roofing and solar needs simultaneously, requiring coordinated expertise in both areas
Consider Greiner Heating Air And Electric if...
- ✓ You need HVAC system installation, repair, or replacement for heating, cooling, or heat pump equipment
- ✓ You're dealing with an urgent heating or cooling failure and need same-day emergency response
- ✓ You want to establish a bi-annual maintenance program with scheduled service reminders and priority access
- ✓ Your project involves electrical work, thermostat installation, duct replacement, or water heater services alongside HVAC needs
Questions to Ask Before Hiring
- → If considering both companies for separate projects, ask each about scheduling coordination to avoid conflicts when work overlaps
- → Ask Citadel about their roofing warranty terms when solar installation is included versus standalone roof replacement
- → Ask Greiner about their maintenance program pricing and what priority service specifically includes for program members
- → Confirm with either company whether they coordinate with other trades or if you'll need to manage scheduling between contractors yourself
The Bottom Line
You're not choosing between comparable contractors—you're deciding which home improvement project to pursue. Citadel Roofing And Solar is your contractor if you need roofing work, solar panel installation, battery backup systems, or repairs to existing solar equipment. Greiner Heating Air And Electric is your choice for HVAC system installation, heating and cooling repairs, or electrical work. Both are veteran contractors with excellent track records, full insurance coverage, and strong customer feedback in their respective specialties. If you're genuinely evaluating both solar and HVAC projects, prioritize HVAC efficiency upgrades first to ensure accurate solar system sizing, then hire Citadel for solar installation afterward.
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Frequently Asked Questions
No, these companies operate in different trades. Citadel handles roofing and solar installations but doesn't do HVAC work. Greiner provides HVAC and electrical services but doesn't install solar systems. You'd need to hire both separately and coordinate the scheduling yourself, or find a general contractor to manage both subcontractors.
This question only applies if you have an HVAC or solar emergency. Greiner's reviews frequently mention same-day response for heating and cooling failures. Citadel demonstrates responsiveness for solar system diagnostics and repairs, but the urgency differs—HVAC failures impact immediate comfort while solar issues affect energy production and utility bills over time.
Both qualify as veteran contractors with deep expertise, so the gap matters less than trade specialization. Greiner's 47 years versus Citadel's 34 years both represent multi-decade track records. What matters more is which trade you need—solar/roofing expertise or HVAC/electrical capabilities—rather than comparing their relative experience levels.
Generally, complete HVAC upgrades before solar installation so you can accurately size your solar system based on your home's actual energy consumption with efficient equipment. An oversized or undersized solar array from basing calculations on old, inefficient HVAC equipment creates long-term problems. Ask Citadel how they calculate system sizing if you're planning HVAC changes.
Looking for the Best?
See our ranked list of top solar contractors in Solano.
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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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