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Delta Electric vs Therma
Santa Clara Electrical Contractors Comparison · Updated March 2026
This is an apples-to-oranges comparison: Delta Electric is a veteran electrical contractor, while Therma is an experienced commercial mechanical contractor serving entirely different trades.
| Delta Electric | Therma | |
|---|---|---|
| Rating | ★ 5.0 | ★ 4.6 |
| Years Licensed | 43 years | 9 years |
| License # | 429472 | 1027316 |
| Workers' Comp | — | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | San Jose, CA | San Jose, CA |
| Website | deltaelectric.net | www.therma.com |
Key Differences
What Customers Say
Therma
Customers consistently praise Therma's technical capabilities, custom fabrication quality, and professional approach for commercial mechanical projects.
Key Takeaway: Therma has documented customer feedback highlighting their manufacturing precision and quality standards, while Delta Electric has limited review history available despite decades of operation.
Customer Reviews
Delta Electric
I find it hard to find an electrician, plumber, general contractor, etc. If you're old and ignorant like me, you have no way of knowing if what the professionals tell you is true, if their estimates a...
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 Delta Electric if...
- ✓ You need a veteran electrical contractor with over four decades of experience navigating complex electrical systems and local codes
- ✓ You're comfortable verifying your homeowner's insurance covers contractor injuries, since Delta Electric lacks workers compensation on file
- ✓ Your project is electrical in nature (wiring, panels, circuits) rather than mechanical or HVAC-related
- ✓ You're willing to work with a contractor that has limited online review history but extensive licensing tenure
Consider Therma if...
- ✓ You need commercial mechanical work, HVAC duct manufacturing, or custom metal fabrication rather than electrical services
- ✓ Workers compensation coverage is a non-negotiable requirement for your project and peace of mind
- ✓ Your project involves specialty ducting, medical gas systems, plumbing, or industrial process equipment
- ✓ You want a contractor with documented customer feedback praising technical capabilities and manufacturing quality
Questions to Ask Before Hiring
- → Ask Delta Electric to confirm their liability insurance coverage and verify with your homeowner's insurance whether you're protected if a worker without workers comp is injured on your property
- → Ask Therma whether they handle residential projects or if their focus is exclusively commercial and industrial work
- → Ask Delta Electric for references from recent projects similar to yours given the limited review history
- → Clarify the exact scope of work needed to determine which trade license (electrical versus mechanical) actually applies to your project
The Bottom Line
This comparison only makes sense if your project requires both electrical and mechanical work from separate contractors. For electrical work, Delta Electric offers veteran experience but you must address the workers compensation gap before hiring. For commercial mechanical or HVAC work, Therma provides full insurance coverage and documented quality but appears focused on commercial clients. Determine which trade your project actually requires, then evaluate the appropriate contractor. If you need residential HVAC work, verify Therma handles residential projects. If you hire Delta Electric, confirm liability coverage with your insurance agent first.
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Frequently Asked Questions
Most likely no. Delta Electric holds an electrical contractor license for wiring, panels, and electrical systems. Therma holds a mechanical contractor license for HVAC, plumbing, and fabrication work. These are different trades requiring different licenses. Verify which trade your specific project requires.
Very significant. If a Delta Electric worker is injured on your property, you could face liability claims and medical bills depending on your homeowner's policy. Therma's workers comp coverage protects you from this risk. Contact your insurance agent before hiring any contractor without workers comp.
Not necessarily, since they serve different trades. Delta Electric's veteran status demonstrates deep electrical expertise, while Therma's 9 years with strong commercial reviews shows solid mechanical contracting capability. Experience matters within the relevant trade, not across different specializations.
The data suggests Therma focuses primarily on commercial and industrial projects like duct manufacturing and custom fabrication. If you have a residential HVAC need, ask directly whether they take on residential work or if their capacity is dedicated to commercial clients.
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 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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