The cost savings comparison in improving the energy efficiency of your home can be measured, as in the chart below (BaseZero,LLC).
Improvement Energy savings in BTUs
Wall from R30 to R40 200,000
Floor from R38 to R44 500,000
Windows from U-0.28 to U-0.22 700,000
Heat Pump HSPF from 9.5 to 10.5 300,000
ACH from 2.5 to 1.5 700,000
Adding 1kWh PV panels (solar) 4,800,000
Adding one 180 Watt PV panel 796,000
Ceilings from R50 to R60 300,000