In the first year of a new city ordinance, energy audits were completed for 4,862 homes. Here are the most common issues uncovered during that year:
58 percent needed window shading (solar screens on windows).
Nearly 80 percent needed more attic insulation (another 0 inches, on average).
About 68 percent needed duct repair work in attics. (On average, 22 percent of the air conditioning in older homes leaks into the attic, Austin Energy says.)
78 percent needed weatherstripping, sealing or caulking around windows, doors and other openings
In all, 520 homeowners made energy-efficiency improvements, with 229 making them before the home sold and 29 making them after.