Make sure your AC is cool

Task: Now’s your last chance to double-check your air-conditioning unit and make sure it’s in good working order before the mercury starts to rise.

Shortcuts: Hook up a garden hose and spray the outside of the condenser to remove any dust that’s settled on the unit and connections. (Yes, dust can affect your AC’s effectiveness.) Don’t use a brush, and be careful if pressure washing—you could damage or bend the fins. Make sure to change the filter, too.