When something goes wrong with a central air-conditioner,
call a service contractor. We reccomend you schedule a tune-up for the
start of every cooling season to avert problems. For example, some of
the refrigerant may have leaked out—a condition that gradually
diminishes your system's efficiency.
Once a month, refer to the list below to make sure air flows freely
through the condenser, evaporator coils, and your furnace's blower unit.
Examine one of the coils and you'll see that it resembles an automobile's
radiator—loops of tubing laced through a honeycomb of aluminum
fins. Leaves, debris, or even a heavy accumulation of household dust
on these fins can choke off the airflow upon which cooling systems depend.
When you clean the fins, treat them gingerly; they bend easily, and
sharp tools may puncture the relatively soft copper tubing.
Don't neglect your furnace's blower unit, either. Moving cool, heavy
air strains belts and bearings.
Maintenance tasks
Keep the condensing unit clear for airflow. Hose out leaves and keep
shrubs pruned back.
During humid weather, check the condensate drain to be sure that it
is carrying off excess moisture.
A clogged filter can shut down a unit. Change filters several times
per season; never run a system without a filter.
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