Compare Local Pros
Wong Electric vs Therma
Santa Clara Electrical Contractors Comparison · Updated March 2026
You're comparing an electrical contractor to a commercial mechanical contractor—these companies serve fundamentally different needs and project types.
| Wong Electric | Therma | |
|---|---|---|
| Rating | ★ 3.6 | ★ 4.6 |
| Years Licensed | 41 years | 9 years |
| License # | 464550 | 1027316 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Palo Alto, CA | San Jose, CA |
| Website | www.wongelectric.com | www.therma.com |
Key Differences
What Customers Say
Therma
Customers consistently praise Therma's high-quality custom fabrication work, manufacturing capabilities, and professional approach to commercial mechanical projects.
Key Takeaway: Therma has documented customer feedback emphasizing technical capabilities and fabrication quality, while Wong Electric has limited review history available despite four decades of operation.
Customer Reviews
Wong Electric
Top electrician in the bay area. Really takes care of their customers.
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 Wong Electric if...
- ✓ You need electrical work performed—wiring, panel upgrades, lighting installation, or electrical system repairs
- ✓ You value working with a veteran contractor who has seen four decades of electrical code changes and complex troubleshooting scenarios
- ✓ Your project is in Palo Alto or nearby areas where their 41 years of local operation provides familiarity with regional requirements
- ✓ You're comfortable proceeding with limited available customer feedback but appreciate their long-standing licensure
Consider Therma if...
- ✓ You need commercial mechanical work, particularly HVAC duct manufacturing or custom metal fabrication
- ✓ Your project involves specialty ducting components, medical gas systems, or industrial process equipment
- ✓ You're managing a commercial or industrial facility in Silicon Valley requiring high-volume manufacturing capacity
- ✓ Customer feedback about quality and technical capabilities is important to your decision, and Therma provides documented praise for their fabrication precision
Questions to Ask Before Hiring
- → Confirm which specific trade services you need—electrical versus mechanical—before contacting either contractor
- → Ask Wong Electric for recent project references to supplement their limited review history
- → Ask Therma whether they take on residential projects or if their focus remains exclusively commercial and industrial
- → Verify that the contractor you choose has specific experience with your exact project type rather than just general trade licensure
The Bottom Line
This comparison only makes sense if you're uncertain which trade you need. If you need electrical work—wiring, panels, circuits, lighting—Wong Electric is your only option here despite limited reviews, and their 41 years provides substantial expertise. If you need commercial mechanical work, HVAC duct manufacturing, or industrial fabrication, Therma is the appropriate contractor with documented quality feedback. Identify your project's trade requirements first, then contact the contractor licensed for that specific work.
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Frequently Asked Questions
No, these are separate trade licenses. Wong Electric holds an electrical contractor license, while Therma holds a mechanical contractor license. Each can only legally perform work within their licensed trade. If your project requires both electrical and mechanical work, you'll need to hire separate contractors.
Therma's description and customer feedback strongly suggest a commercial and industrial focus, particularly HVAC duct manufacturing and custom fabrication for facilities. While their mechanical license could cover residential work, their documented project types are all commercial. Ask directly whether they accept residential projects before pursuing them.
The experience comparison is irrelevant because they serve different trades. Forty-one years of electrical experience doesn't help with mechanical fabrication, and nine years of mechanical expertise doesn't apply to electrical work. Choose based on which trade you need, not experience duration.
Review availability varies by contractor marketing practices and customer engagement, not necessarily service quality. Wong Electric's 41-year tenure proves sustained business operations, but limited online feedback means you should request direct references. Therma's visible reviews provide useful insight into their commercial fabrication capabilities.
Looking for the Best?
See our ranked list of top electrical 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 07, 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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