Nielson Mechanical Inc

Nielson Mechanical Inc has operated as a design-build HVAC contractor from Fairfield, California since 1996. The company holds California contractor licensing and specializes in custom heating and cooling system design, installation, and maintenance for commercial and residential clients across the Bay Area region. Their project portfolio demonstrates capability ranging from single-family dwellings to mid-rise and large commercial highrise developments, with documented work in Vallejo, Sacramento, Fremont, and San Francisco. The business has progressively evolved from residential foundations toward primarily commercial HVAC engineering, offering both complete design-build services and design-assist packages for full mechanical packages.

What distinguishes this contractor is their in-house engineering capacity and specialized system expertise. Their team provides energy calculations, model energy code compliance documentation, auto-cad prints, and official engineering stamps, capabilities that many smaller HVAC companies outsource entirely. Nielson Mechanical designs and installs packaged rooftop units, split system air handlers, infrared heating systems, make-up air units, kitchen hood exhaust systems, and cooler/refrigeration systems. They service an extensive roster of major HVAC brands including Trane, Mitsubishi Electric, Daikin, GL, Honeywell, Lennox, American Standard, and Sondex, enabling flexible recommendations based on project requirements rather than exclusive brand partnerships.

Notable commercial installations in their portfolio include Barbacco-Eno Trattoria in San Francisco, Savage & Cooke Distillery in Vallejo, and multiple 99 Ranch Market locations across Fremont and Sacramento. These projects demonstrate experience across diverse commercial settings including restaurants, retail spaces, corporate offices, medical facilities, educational institutions, car dealerships, and manufacturing production facilities. Their portfolio also spans boiler, chiller, and cooling tower installations, specialized mechanical infrastructure that requires different technical expertise than standard forced-air conditioning systems.