Because the pairs are the cities'. The Escondido site claims HVAC pairs for Escondido only; this site claims San Marcos pairs only, serves San Marcos's four covered ZIP codes, and is written from this city's evidence: San Elijo Hills to Cal State service geography, inland heat urgency in local operators' own copy, and 40 plus year units in the local record. Neighboring cities in one metro are the fleet's standing pattern where the gates clear both, as they did here and in Escondido's own pass. Different city, different pairs, no shared claims.
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