The full diagnostic path the way a technician runs it: six free checks, symptom-by-symptom causes, honest repair costs, the heat-wave check, and when to stop and call.
Video guides
Watch it explained, then read the full guide
Every video pairs with a written guide that carries the depth — all causes, all costs, and when to stop and call. Also on YouTube @HVACServiceCall.
The three numbers that settle repair-or-replace: system age, the one-third rule, and breakdown frequency — plus the warranty check, a worked example, and the pressure red flag.
The five free checks that solve most 'broken AC' calls: thermostat mode, air filter, blocked vents, tripped breaker, and heat-pump mode — in 80 seconds.