Periodically, the Low-Income Weatherization Assistance Program in Nebraska is evaluated to analyze its effectiveness and to find ways to increase the energy and dollar savings of those receiving the free services. Similar studies are also conducted across the nation.
      The most recent study: 

Nebraska Evaluation, 1993-1994 and 1994-1995
      The average home weatherized during program years 1993/94 and 1994/95 saved an average of 18.7% of total consumption of the fuel used for heating. This resulted in an average reduction of $126 in annual utility bills. Due to the decrease in energy use, these homes also contributed to reducing emissions of greenhouse gases. On average, each home reduced carbon dioxide emissions by 2,297 pounds, sulfur dioxide emissions by 0.435 pound, and nitrogen oxides by 0.706 pound.
      Click here for the complete study.