Jurupa Valley AC install work splits across two distinct profiles because the 2011 incorporation merged four older communities. Mira Loma and Glen Avon homes built 1960s-1990s are usually replacing original or first-replacement R-22 equipment. These installs commonly require a new refrigerant line set (R-454B is incompatible with R-22 mineral oil residue), sometimes panel upgrade from 100A to 200A, and occasional return-duct upsizing for proper airflow on modern variable-speed equipment. Sunnyslope and Pedley newer subdivisions (2000+) run cleaner first-replacement work — same-tonnage swap, same line set. Manual J load calculation is essential at this 700 ft elevation along the Santa Ana River corridor where summer afternoons regularly hit 100-105°F and undersized equipment never recovers from the heat. We size for actual cooling load, not rule-of-thumb tonnage.