PROPER HVAC INC in Chula Vista holds CSLB License #1008716 with active C-20 and C-36 classifications, covering both warm-air HVAC systems and plumbing from its 1st Avenue headquarters in the 91911 corridor. The dual-trade license means a single crew can connect gas lines, set a furnace, and run the condensate drain without subcontracting, a renovation efficiency valued during full kitchen-and-bath overhauls where tile and stone work from Quality Design Tile & Stone follows immediately after rough-in. Operating also under the BRS Mechanical name, the company handles residential and commercial installations including split-system AC, furnace replacement, water-heater hookups, and ductless mini-split mounts. Post-construction cleanup after attic air-handler swaps generates insulation debris and drywall dust that circulates through the new ductwork if not addressed — a contamination risk mitigated by the deep-cleaning crews at The Mighty Maids before system commissioning. Technicians verify completed installations by running a static-pressure test across the supply and return plenums, targeting the 0.5 inches of water column maximum specified by ACCA Manual D for residential duct design.