The US government just fixed how it measures compressor efficiency

The US Department of Energy updated its rules for testing air compressors. This means manufacturers must now use a more accurate formula to measure how much energy their machines use.

For years, the official way to measure compressor efficiency had a math error. This meant some compressors could appear more efficient than they actually were, especially at different altitudes. Now, the government will use a corrected formula, which could change how some models are rated for energy use.