Once a year per function: cooling before the heat season, heating before the cold season, which for most homes means one or two visits a year. The work that matters is unglamorous: coils cleaned, the condensate drain flushed (its failure is the one that floods ceilings), electrical components tested against readings, and safety controls proven on heating equipment. Shoulder season scheduling is the practical advice: the same visit in the first heat wave joins a queue of people whose systems already failed.
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