“Weatherization facts:
– Low income families will realize greater comfort and additional disposable income, saving over $400 in reduced energy costs (at current prices) the first year. This equates to a 23% reduction in primary heating and cooling fuel costs.
– Taken together every $1 invested in the weatherization program returns $2.72 in energy and non-energy related benefits.
– Some of the largest returns are from the easiest projects including weatherstripping doors and windows, caulking exterior cracks and replacing door sweeps and door bottoms.
– Reducing energy demand decreases the environmental impacts of energy production.”

Source: Weatherization Facts
Image source: Green World 365
Image source: DIY Life
Image source: Soundproofing.org