Bay Area Service Hub Review
In business since 2001, Sandium is an engineering-led HVAC contractor specializing in whole-home system design, heat-pump conversions, and energy-efficiency retrofits across Silicon Valley. Reviewers consistently praise thorough assessments, knowledgeable and tidy technicians, and competitive pricing backed by strong rebate expertise, though a recurring theme is slow after-sale warranty and repair turnaround when problems arise. Best for homeowners planning a new installation or electrification upgrade who value design rigor and rebate help over emergency-repair speed or the lowest bid.
Evaluation Scores
Workmanship
8.5
Quality of work performed
Customer Service
8.0
Responsiveness & communication
Pricing
8.5
Clear & honest pricing
Reliability
7.5
Consistency & dependability
Expertise
9.0
Technical skills & certifications
Warranty Support
6.5
Post-service coverage
Essential Q&A
What makes this contractor stand out?
An engineering-first, whole-home design approach led by an engineer-owner, which separates them from install-only competitors who skip load calculations and root-cause assessment.
Who should hire this contractor?
Homeowners planning a new system, heat-pump conversion, or whole-home comfort/efficiency upgrade who value design rigor and rebate guidance over rock-bottom pricing or fast emergency repair.
Insider tip
Get on their schedule early and expect a deposit, since they book out; lean on their Energy Upgrade California and PG&E rebate expertise on new installs, and confirm warranty/repair turnaround expectations up front because after-sale support is their weakest area.
Frequently Asked Questions
Is this contractor licensed and insured in California?
Yes. CSLB license #1140043 is active in California with a $25,000 contractor bond (Travelers Casualty and Surety) and workers' compensation coverage on file, with no disciplinary actions on record.
Does this company offer 24/7 emergency services?
Data not available for verification.
What kind of warranty is provided on their workmanship?
They back their installations with a 100% satisfaction guarantee and provide access to manufacturer-backed warranties through their Carrier and Goodman dealer status; a specific labor-warranty term is not published.
Do they provide free estimates or flat-rate pricing?
Yes, they offer free, no-obligation estimates on new equipment plus free second opinions, and they credit the diagnostic fee toward the repair if you approve the work.
How long has this business been serving the Bay Area?
Serving the Bay Area since 2001 — 25 years of HVAC design, installation, and service across San Jose and the greater Silicon Valley.
Are their technicians background-checked and certified?
Their technicians are NATE Certified and factory-trained as a Carrier Factory Authorized Dealer; background-check and drug-testing policies are not published for verification.
Platform Scorecard
Cross-platform reputation comparison
Google
312 reviews
Yelp
167 reviews
BBB
A+
Checkbook.org
superior rating
77 ratings
Services Offered
Areas of Expertise
Certifications
Authorized Dealer
Service Areas
Rebate & Incentive Expertise
This contractor can help you navigate:
Professional Memberships
License Details
Status
Active
Classifications
Issue Date
2025-07-08
Expires
2027-07-31
Bond Amount
$25,000
Workers Comp
Active
Disciplinary Actions
None
Verify This Information
All data sourced from official platforms
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