Delta T Energy Consulting

Delta T Energy Consulting operates in Cotati, California, delivering specialized engineering consulting services focused on energy compliance and efficiency verification. The firm maintains a 4.9-star rating derived from 30 client reviews, reflecting consistent quality across residential and commercial projects. Working hours span Monday through Friday from 9 AM to 5 PM, with Saturday availability until noon. The business serves the broader Sonoma County region, assisting builders, contractors, and homeowners navigate state-mandated energy requirements.

What distinguishes Delta T Energy Consulting is their concentrated expertise in California's specific regulatory landscape. The firm specializes in Cal Green building standards and Title 24 energy compliance documentation, services that prove essential for new construction and major renovations. They conduct HERS (Home Energy Rating System) testing, providing objective efficiency verification that contractors and homeowners require for permit approval. This narrow focus enables deep knowledge of compliance pathways that generalist HVAC contractors typically lack.

Reviewers describe working with team members including Roy, who appears across multiple client experiences. One homeowner notes Roy walked them through the Cal Green inspection process, remaining available for questions and following up with recommended HVAC companies. Another reviewer recounts how the team tested design modifications for a sunroom project to ensure Title 24 compliance before finalizing construction plans. A third describes ongoing HERS testing collaboration where the team adapted to time-constrained communication needs while maintaining professionalism and punctuality.