Allegiance Heating & Air Conditioning Inc. in Santee holds CSLB license #548700 and has operated as a woman-owned HVAC contractor from Suite 204 at 8733 Magnolia Avenue since its 1984 founding. The company's scope covers residential and commercial installation, replacement, and repair alongside property-management maintenance contracts, with renovation projects often sequenced alongside finish-floor work from Village Flooring & Renovations on Magnolia Avenue. Services extend beyond standard heating and cooling into duct cleaning, plumbing, and limited crane operations for rooftop equipment placement on commercial buildings. ADU construction projects requiring dedicated HVAC systems in detached accessory structures frequently run through builders including West Coast ADUs elsewhere in the 92071 ZIP, with Allegiance handling the mechanical design and installation scope. The firm's most technically demanding installations involve multi-zone commercial rooftop package units with economizer controls, demand-controlled ventilation, and variable-air-volume distribution systems sized to Title 24 Part 6 energy-code requirements.