Did you say this was your first experience with a window/wall unit A/C?
I just got a link to a "cleaning tips" story at "Real Simple" that included this:
Quote:
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Air conditioners: When your A/Cs are in use (say, from May through September), it’s smart to clean them monthly so they don’t get listless (or conk out completely) on the hottest days of summer. First turn off the power and pop off the front panel. Remove the spongy filter and soak it in the sink in equal parts warm water and white vinegar for about an hour. Use the vacuum’s crevice attachment on the coils. After you’ve replaced the filter (wait until it’s dry) and the front panel, dust the exterior and the control buttons with a disinfecting wipe. Have central air? Once a season, unscrew the vent covers and clean the slats on both sides with a damp cloth.
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Maybe yours needs a good cleaning (to maybe not have to work so hard)?