Women-led Reitz Heating & Air, Inc. holds CSLB license #1055356 (C-20) and services residential heating, cooling, and ventilation systems from Rab Street in La Mesa. System changeouts that upgrade older furnaces to SEER2-compliant condensing units often require a 240-volt dedicated circuit, an electrical scope coordinated with contractors such as Balboa Electric. The C-20 classification covers fabrication, installation, maintenance, and repair of warm-air heating, ventilating, and air-conditioning equipment, including ductless mini-split systems for ADU conversions and room additions. Equipment replacements in La Mesa's older housing stock near Grossmont College frequently trigger Title 24 energy-compliance documentation and mechanical permits processed through consultants such as The Permit Pro Consultant. Highest-specification installs involve multi-zone ductless heat-pump configurations with individual wall-cassette heads, variable-refrigerant-flow control, and AHRI-certified SEER2 ratings exceeding 20.