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The Most Trusted Source for Appliance & HVAC Industry Professionals
Subscribe3rdGen Building Systems is a Bay Area mechanical contractor headquartered in Berkeley, CA, delivering high-performance HVAC solutions for commercial and residential clients across San Francisco, Oakland, Berkeley, Marin, Walnut Creek, and the Peninsula. The company specializes in VRF system design and installation, tenant improvement HVAC, and design-build mechanical projects, bringing integrated planning and disciplined field execution under one accountable team. On the commercial side, 3rdGen Building Systems focuses on light commercial construction, including office, retail, and adaptive reuse tenant improvement projects. Their design-build approach covers everything from load calculations and system planning through installation and commissioning, with close coordination with general contractors and project teams. They also specialize in mechanical retrofits and electrification upgrades, helping existing commercial buildings transition to high-efficiency, all-electric HVAC systems through heat pump conversions and performance-driven upgrades. For residential clients, 3rdGen offers inverter-driven heat pump and multi-zone VRF installations engineered for precise temperature control, lower energy use, and long-term system performance. Their electrification retrofit services replace gas furnaces and legacy equipment with high-performance heat pump systems, coordinating electrical, ventilation, and system upgrades for fully electric homes. They also provide indoor air quality solutions, including balanced ventilation, ERV installation, advanced filtration, and make-up air systems. With a commitment to clear communication, technical expertise, and performance-driven results, 3rdGen Building Systems positions itself as a trusted partner for complex mechanical projects throughout the greater Bay Area. Their whole-home and whole-building approach ensures that every system—heating, cooling, ventilation, and ductwork—is engineered to work together for maximum comfort and efficiency.
I'm thrilled to have discovered 3rd Gen Heating & Cooling. The smaller team made the experience feel more personalized and trustworthy. They paid exceptional attention to detail, ensuring my needs were met from the design stage to the final execution. The quality of their work is top-notch. I felt confident in their abilities from our very first meeting. They were highly responsive and prompt, which further bolstered my confidence throughout the project. I highly recommend Devin and his team.
I'm in love with 3rd Gen, Devin, and the entire team! They are knowledgeable, professional, kind, and generous. I wholeheartedly recommend working with them.
I had the pleasure of collaborating with Devin today on a commercial project in Danville. As a HERS rater, I've seen numerous AC installations, and this one was among the cleanest I've encountered. This young man takes immense pride in his work and delivers exceptional results. He was a joy to work with, maintaining a professional and accommodating demeanor.
They installed a 5-unit Mitsubishi mini-split system in my home. The technicians consistently cleaned up after themselves and did a fantastic job. I'm grateful for the efforts of Cesar, Devin, and Juan.
I was able to secure a same-day appointment for my two service requests. The technician was friendly, efficient, and addressed all of my queries. They quickly identified the issue and completed the work in less than an hour. The scheduling process was straightforward, and I was able to pay by card. The invoices were emailed to me. I will happily recommend their services to others.