This presentation discusses prioritizing home energy efficiency improvements from the most cost-effective to more expensive measures with longer payback periods. It begins by listing free measures homeowners can take, such as turning off lights and adjusting thermostats. Next, it outlines simple and inexpensive solutions like installing efficient showerheads and lightbulbs. The presentation then covers more serious measures with 1-3 year paybacks, such as weatherization and duct sealing. The final sections discuss expensive upgrades with 3-15 year paybacks like attic insulation and whole home retrofits.