Our house stays fairly cool in summer even though we don’t have central air conditioning.
We do have a window unit in our bedroom which has been running fairly regularly at night for the past few weeks as the weather has been hot and humid.
Charlie noticed that in addition to a dusty filter some dark spots (mildew?) had appeared on other parts of the unit.
He took the front off (held on by two screws) and vacuumed the coils.
Then he used some Clorox disinfectant wipes to wipe down any exposed parts.
The unit is working better and cleaner now.
What small but necessary chore have you been avoiding?