MAV Heating and Air Conditioning/Electrical in Chula Vista combines HVAC contracting with electrical installation service from its Del Mar Avenue address in the 91910 district west of Interstate 805. Residential AC changeouts in Chula Vista's western housing stock often expose deteriorated roof jacks and compromised attic flashing around old furnace vents, leak points that CASAS ROOF INC reseals as part of coordinated retrofit projects. The dual HVAC-and-electrical scope allows the company to handle both the 240-volt dedicated circuit for a new condenser and the thermostat low-voltage wiring in one mobilization. Kitchen and bathroom remodels along the Broadway corridor frequently require relocated supply registers and updated return-air pathways, projects that run parallel to the tile and countertop installations performed by Seaside Tile Inc under the same general-contractor schedule. High-demand service calls include complete condenser-coil replacements on R-22-to-R-410A refrigerant conversions, requiring new copper line sets brazed to nitrogen-purge specifications per EPA Section 608 handling protocols.