Compare Local Pros
Greiner Heating Air And Electric vs United Heating And Cooling
Solano HVAC Contractors Comparison · Updated March 2026
Greiner brings 47 years of experience versus United's 19 years, with significantly more customer feedback showing consistent service patterns including same-day response and detailed communication.
| Greiner Heating Air And Electric | United Heating And Cooling | |
|---|---|---|
| Rating | ★ 5.0 | ★ 5.0 |
| Years Licensed | 47 years | 19 years |
| License # | 365955 | 900840 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Dixon, CA | Vacaville, CA |
| Website | www.ghac.com | — |
Key Differences
What Customers Say
Greiner Heating Air And Electric
Customers consistently praise Greiner for thorough inspections with photographic documentation, detailed technical explanations, same-day emergency response, and respectful property treatment across diverse project types from tune-ups to full system replacements.
United Heating And Cooling
United receives positive feedback for professional conduct and efficient installation work, with customers noting clean workmanship and proper system function after AC installations.
Key Takeaway: Greiner's feedback spans the full service spectrum from emergency repairs to maintenance programs, while United's documented experience focuses primarily on new installation projects, suggesting different operational breadths.
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...
United Heating And Cooling
Great service! I will defenely call them for future service.
Amazing service. The United Heating & Air Conditioning team was professional, efficient, and had our new AC installed in no time. Everything works perfectly and my house is cool and comfortable again!...
An Extremely hard working and dedicated family business always at your service with heating and cooling! Professional staff that knows how to get the job done, highly recommended 🔥💯
Consider Greiner Heating Air And Electric if...
- ✓ You need diagnostic expertise for an aging HVAC system where hidden issues like duct deterioration or electrical problems may complicate what seems like a simple repair
- ✓ Same-day or emergency response matters because you're facing a heating or cooling failure that affects your family's comfort or safety
- ✓ You want a maintenance relationship with a company that provides scheduled bi-annual service visits, reminders, and priority service for existing customers
- ✓ You need both HVAC and electrical work completed, allowing one contractor to handle interconnected issues with system wiring or panel capacity
Consider United Heating And Cooling if...
- ✓ You're planning a straightforward new AC system installation where United's documented strength in efficient, clean installation work aligns with your project scope
- ✓ You prefer working with a family-operated business and value that operational structure for your service relationship
- ✓ The 19-year track record provides sufficient experience depth for your particular HVAC needs without requiring the extended history Greiner offers
Questions to Ask Before Hiring
- → Ask Greiner about their current average response time for emergency calls and whether their same-day service applies to your specific location in Solano County
- → Ask United about their diagnostic and repair capabilities beyond new installations, and request references from customers who've used them for complex troubleshooting or older system repairs
- → Ask both companies how long their current lead technicians have been with the company to understand workforce stability beyond the licensing history
The Bottom Line
Greiner Heating Air And Electric holds clear advantages for most homeowners in this comparison. With 47 years of continuous operation, comprehensive HVAC and electrical capabilities, documented same-day response, and extensive feedback showing thorough diagnostic work and detailed customer communication, they offer substantially more proven capacity than United. Choose United if you specifically want a family-operated company for a straightforward new AC installation and their 19-year track record meets your comfort level. For everything else—complex repairs, older systems, emergency situations, maintenance relationships, or projects requiring both HVAC and electrical work—Greiner's experience depth and service breadth make them the more reliable choice.
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Frequently Asked Questions
For a simple system swap in a newer home with standard ductwork, the gap matters less since both companies demonstrate competent installation work. However, if your home is older or you're uncertain about duct condition, electrical capacity, or proper system sizing, Greiner's 47 years provides substantially more exposure to complications that can derail what appears to be a straightforward project. Even new installations benefit from experienced eyes spotting issues before they become problems.
The volume difference likely reflects both company size and service breadth. Greiner offers maintenance programs, emergency repairs, tune-ups, and both HVAC and electrical work, generating more customer touchpoints than a company focused primarily on installations. This breadth of feedback gives you better visibility into how Greiner handles various situations, while United's more limited feedback concentrates on their core installation work.
Family operation can mean more consistent quality control and direct owner accountability, which some homeowners value. However, it can also mean limited availability and fewer technicians for urgent situations. Greiner's ability to provide same-day service suggests larger staff capacity, which matters if you need rapid response. Ask United directly about their availability for emergencies and how many technicians they employ.
Both Dixon and Vacaville are centrally located in Solano County, so geographic proximity shouldn't be your deciding factor. Focus instead on response time commitments and service area boundaries. Greiner's documented same-day service capability may indicate stronger coverage across the county, but confirm with both companies that they fully serve your specific location without travel charges or delayed response.
Looking for the Best?
See our ranked list of top hvac contractors in Solano.
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Plumbing Doctor
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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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