How many blues musicians does it take to replace an inefficient light bulb with an energy-efficient one?
Five: One to replace the light bulb, and four to play sad songs about how the old, inefficient bulbs went away, and maybe they weren’t so bad after all.
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Check your HVAC system’s air filter monthly. If it looks dirty, change it. A dirty filter makes your system work harder.
Source: U.S. Department of Energy