There's no need to blast the AC while you're away. For
central units, install a
programmable thermostat that lets you set
higher temps when you're gone and cooler temps when you're home. Newer
window units have built-in timers and adjustable thermostats, or you can
buy a timer at any home store for $10 to $20; just make sure it matches
your device's voltage. Unless you're going on vacation,
don't shut off
the system; otherwise, the air compressor will need to work harder to
cool your house later.
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