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Asco Service vs Therma
Santa Clara HVAC Contractors Comparison · Updated March 2026
Asco Service brings 26 years of licensing versus Therma's 9 years, but Therma specializes in commercial mechanical work while Asco focuses on residential heating repair.
| Asco Service | Therma | |
|---|---|---|
| Rating | ★ 1.0 | ★ 4.6 |
| Years Licensed | 26 years | 9 years |
| License # | 778556 | 1027316 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Gilroy, CA | San Jose, CA |
| Website | ascoair.com | www.therma.com |
Key Differences
What Customers Say
Asco Service
Asco Service has minimal documented customer feedback despite 26 years of licensing, making it difficult to assess current service patterns or customer satisfaction trends.
Therma
Therma receives consistent praise for high-quality manufacturing work, professional service, and technical capabilities in commercial mechanical projects including custom fabrication and specialty ducting.
Key Takeaway: Therma has substantial documented customer feedback focused on commercial work quality while Asco Service operates with virtually no public review history despite significantly longer licensing tenure.
Customer Reviews
Asco Service
No reviews available
Therma
Did Stanford blood donation here today.
Can't say enough about this company this group of guys the work that they do and the high technology that they are getting involved in. There is a manager Paul there, great guy hard worker. The compan...
Top notch mechanical contractor. Very professional.
Consider Asco Service if...
- ✓ You need residential heating repair or service and want a contractor with over two decades of licensing history in California
- ✓ Your project is straightforward residential work where veteran experience with code compliance and hidden issues in older homes matters more than documented recent feedback
- ✓ You prefer working with a Gilroy-based contractor who has maintained continuous licensing through multiple economic cycles
Consider Therma if...
- ✓ Your project involves commercial or industrial mechanical work, HVAC duct manufacturing, or custom metal fabrication
- ✓ You need a contractor with documented customer feedback praising technical capabilities and manufacturing precision
- ✓ Your work requires specialty ducting components, medical gas systems, or process equipment fabrication where Therma has proven expertise
Questions to Ask Before Hiring
- → Ask Asco Service for recent customer references and clarification on their current service specialties beyond basic heater repair
- → Ask Therma directly whether they handle residential projects or if their focus is exclusively commercial and industrial work
- → Confirm with both contractors that their crew has experience with your specific project type and ask for similar project examples
- → Ask about typical project timelines and whether your project size aligns with their standard workload
The Bottom Line
These contractors serve different markets, and choosing between them depends entirely on your project type. If you need residential heating repair or service, Asco Service's 26 years of licensing history suggests veteran experience, but you must request recent customer references to verify current service quality given the minimal review documentation. If your project involves commercial mechanical work, HVAC duct manufacturing, or custom fabrication, Therma has documented customer praise for technical capabilities and manufacturing precision. For residential HVAC work, contact Asco first but ask detailed questions about recent projects. For commercial work, Therma is the clear choice.
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Frequently Asked Questions
Therma's documented experience centers heavily on commercial and industrial mechanical contracting, including HVAC duct manufacturing for facilities and custom fabrication. If you have a residential project, ask directly whether they take on residential work and whether their pricing structure is designed for smaller homeowner projects versus commercial contracts.
Many veteran contractors built their reputation through word-of-mouth before online reviews became standard, or they may serve a smaller, repeat customer base. The limited review history means you should ask Asco directly for recent customer references and examples of projects completed in the last few years to verify current service quality and capacity.
Yes, but context matters. Asco's 26 years means experience with older building systems, legacy code issues, and diagnosing hidden problems in aging homes. Therma's 9 years is still experienced-tier, but their strength lies in commercial mechanical expertise rather than residential troubleshooting. The licensing gap matters less than whether the contractor specializes in your project type.
Based on available data, Asco Service appears more aligned with residential heating work, though you'll need to confirm their capacity for full system replacements versus just repairs. Therma's commercial focus and manufacturing capabilities may not translate to competitive pricing or interest in residential replacement projects. Ask both contractors directly about their residential HVAC replacement experience and request similar project references.
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See our ranked list of top hvac contractors in Santa Clara.
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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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