- A heavy coat of dust on a light bulb can block up to half of the light.
- When you turn on an incandescent light bulb, only 10% of the electricity used is turned into light. The other 90% is wasted as heat.
- A compact fluorescent light bulb uses 75 percent less energy than a regular bulb and it can last up to four years.
- A crack as small as 1/16th of an inch around a window frame can let in as much cold air as leaving the window open three inches.
- Some new refrigerators are so energy-smart they use less electricity than a light bulb.
- Every time you open the refrigerator door, up to 30 percent of the cold air can escape.
- Every year, more than $13 billion worth of energy leaks from houses through small holes and cracks. That's more than $150 per family.
- Office buildings use approximately 19 percent of all energy consumed in the United States.
- Heating, ventilating and air conditioning systems account for 40-60 percent of total energy use in the commercial sector.
Source: Point Park University
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