Licensing and Insurance
California requires C-20 (warm air heating) or C-38 (refrigeration) contractor licenses. Verify at cslb.ca.gov. Ensure they carry liability and worker's comp insurance.
Experience and Reputation
Look for established companies with Bay Area experience. Check Google, Yelp, and BBB reviews. Ask for local references you can contact.
Brand Partnerships
Authorized dealers receive manufacturer training and may offer extended warranties. Ask about certifications from major brands.
Transparent Pricing
Quality contractors provide written estimates with equipment specifications, warranty details, and scope of work. Avoid vague verbal quotes.
Service Guarantees
Ask about satisfaction guarantees, installation warranties, and ongoing service agreements. A company that stands behind work is more invested in quality.
Red Flags to Avoid
High-pressure sales, cash-only deals, unwillingness to pull permits, and drastically lower prices than competitors all suggest problems.