Covina sits further inland in the San Gabriel Valley, so summers here run hotter and drier than the coastal parts of LA County. Many aging systems are pushed through weeks of triple-digit afternoons, making them far more likely to short-cycle, blow warm air, or quit entirely right when you need it most. When that happens, you need a team that diagnoses the actual problem the first time, not one that just gets the house cool for a few days before the same issue comes back.