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Evergreen Air HVAC vs Therma Tech
Santa Clara HVAC Contractors Comparison · Updated March 2026
Therma Tech brings 18 years of licensing versus Evergreen Air HVAC's 3 years, offering significantly more experience navigating complex HVAC problems.
| Evergreen Air HVAC | Therma Tech | |
|---|---|---|
| Rating | ★ 5.0 | ★ 4.9 |
| Years Licensed | 3 years | 18 years |
| License # | 1102856 | 913806 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Palo Alto, CA | San Jose, CA |
| Website | evergreenairhvac.com | www.thermatechhvac.com |
Key Differences
What Customers Say
Evergreen Air HVAC
Customers emphasize exceptionally fast emergency response times and direct owner involvement throughout projects, with particular appreciation for competitive pricing that beats other estimates.
Therma Tech
Customers highlight thorough diagnostic processes with photo documentation and detailed explanations, combined with professional crews that maintain quality over repeat business spanning multiple years.
Key Takeaway: While both receive praise for responsiveness and transparency, Evergreen Air HVAC stands out for speed and owner accessibility, while Therma Tech distinguishes itself through comprehensive diagnostic documentation and sustained long-term customer relationships.
Customer Reviews
Evergreen Air HVAC
Super prompt! Extremely knowledgeable! Fixed our broken heater quickly, highly reccomend!!
Great experience - they came instantly and fixed the issue.
Nguyen was a pleasure to work with-friendly, reliable, and very accommodating. He showed up on time for multiple appointments and was flexible in arranging visits around my urgent situation. He also w...
Therma Tech
Those of you reading my reviews, you know how important quality of service is to me. Any company I come in contact with, I pay close attention to their quality of service, value and even some time aft...
Everyone at Therma Tech was great to work with and professional. They worked with us to get the duct work done as soon as possible to get the heat back on for our tenants.
Very honest and knowledgable. They arrive right on time and are able to root-cause the issue and fix it in no time. Highly recommend them.
Consider Evergreen Air HVAC if...
- ✓ Your project is straightforward like a standard furnace or AC replacement in a newer home without complicating factors, where three years of experience is sufficient for proper execution.
- ✓ You value direct owner involvement throughout the entire process, as customer feedback emphasizes the owner's personal participation in consultations and diagnostics.
- ✓ You need emergency service quickly and appreciate the pattern of same-day response, which reviews highlight as a particular strength for this company.
- ✓ Competitive pricing is your priority and you're comparing multiple quotes, as customers consistently mention beating other contractors' estimates.
Consider Therma Tech if...
- ✓ Your home is older or has unusual HVAC configurations where 18 years of experience diagnosing hidden issues becomes valuable insurance against costly surprises.
- ✓ Your project involves commercial property or you need a contractor with demonstrated commercial capabilities beyond residential-only experience.
- ✓ You want the confidence that comes from a contractor who has survived multiple economic cycles and built sustained business relationships over nearly two decades.
- ✓ You value comprehensive documentation practices like photo records of work performed and detailed diagnostic reporting, which customers specifically mention in reviews.
Questions to Ask Before Hiring
- → Ask Evergreen Air HVAC for references from projects similar to yours in age and complexity, particularly if your home was built before 1990 or has custom ductwork.
- → Ask Therma Tech about their crew stability and whether the same technicians who provide estimates will perform the actual installation work.
- → Ask both companies how they handle unexpected complications discovered during installation, including who absorbs costs for unforeseen structural or code compliance issues.
The Bottom Line
If your project is straightforward—a standard system replacement in a newer home without complications—both contractors have the credentials and customer satisfaction to complete the work properly, making Evergreen Air HVAC's competitive pricing worth considering. For older homes, complex installations, or situations where you want maximum experience diagnosing hidden problems, Therma Tech's 18 years of licensing provides substantially more institutional knowledge navigating complications. The experience gap is real and meaningful for non-standard projects. Get estimates from both, but weight Therma Tech more heavily if your home was built before 1990 or if you're concerned about unforeseen issues during installation.
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Frequently Asked Questions
For a straightforward replacement in a newer home with accessible equipment and standard ductwork, both contractors have sufficient experience to complete the work properly. The experience gap becomes meaningful when installations reveal complications like inadequate ventilation, code violations in existing work, or structural issues that require judgment calls about how to proceed. Therma Tech has seen more edge cases over 18 years.
Customer reviews indicate both companies receive praise for competitive and fair pricing, so the experience difference doesn't necessarily translate to a price premium for Therma Tech. Both appear to price projects competitively within the local market. The best approach is to get written estimates from both and compare the scope of work included, not just the bottom line number.
Both companies demonstrate strong same-day and next-day emergency response based on customer feedback, so emergency availability appears comparable. For complex installations in older homes, Therma Tech's 18 years of experience provides more institutional knowledge for handling unexpected complications that frequently arise when opening walls or accessing old ductwork.
Commercial HVAC work typically involves larger systems, stricter code compliance requirements, and more complex load calculations, all of which develop diagnostic and problem-solving skills transferable to complicated residential projects. If your home has zoned systems, multiple units, or unusual square footage, this commercial background adds relevant experience Evergreen Air HVAC hasn't accumulated yet.
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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 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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