I think it's best to get the AC clean and check in the spring, right when
the warm weather starts, but before it's hot. That way the guy can check
with fairly typical outdoor temperatures.
Many units have a shut down switch in case of low freon. You should also
notice the lack of cooling. Many Trane units I've serviced, it's hard to
tell if the outdoor unit needs cleaning. Ask them to be sure to spray on the
cleaning chemicals, let them soak, and rinse off with the garden hose. Even
if it "looks clean".
Christopher A. Young
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