AC Shading: Cool the Machine
Impact
Medium
Difficulty
Easy
Speed
Instant
Your outdoor air conditioner unit (the condenser) works by dumping heat from inside your house to the outside air. If that unit is sitting in direct, blistering secondary sun, it has to work much harder to move that heat.
By providing shade for your AC unit—either with a trellis, some tall shrubs, or a specific awning—you can improve its efficiency by about 3-10%. The cooler the air around the unit, the easier it can do its job. Just be absolutely sure you don't 'choke' the unit. It needs plenty of space for airflow (usually at least 2-3 feet of clearance on all sides). Shading the machine while allowing it to breathe is the key.
Think of it as giving your AC a parasol. It's a more natural way to improve your cooling performance and can even extend the life of the unit by reducing its peak-load stress. Plus, a well-landscaped AC area looks much nicer than a bare metal box on the side of the house. Go green with some shrubs and watch your cooling costs drop!