The Cost of Energy
Energy use can carry a hefty price tag—and not just in money. The cost to our environment, to national security, and to the prospect of future sustainability is sometimes hard to calculate in dollar terms, but nonetheless very real in practical terms. What factors should we consider as we make decisions about energy options for the future?
Understanding EfficiencyLearn the significance of energy efficiency
The Promise of Better LightingEnergy savings through lighting technology
Our Energy SystemA visualization of all our energy sources
- Heating Degree Days
A value representing the amount of fuel required for building heating, calculated by summing the difference of each day's average temperature below 65 degrees Fahrenheit.
Search the National Academies Press website by selecting one of these related terms.
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