Hattiesburg's average summer attic temperature peaks above 140°F. If your attic insulation is below R-30 (about 10 inches of blown cellulose), you're paying for it every month from May through October.
Upgrading from R-19 to R-49 in a typical Hattiesburg 1,800 sq ft home costs $1,400–$2,100 with a verified handyman crew. Average summer cooling bill drops 22–28%, which in this climate is roughly $55–$80/month.
Payback math: the upgrade pays for itself in 24–32 months on energy savings alone. Add Mississippi Power's residential rebate (currently $0.10/sq ft for qualifying upgrades) and the payback drops under 24 months.
Hattiesburg pros on HandyMandyMan can complete a full attic blow-in in a single day. Book in spring or fall — summer attic work is brutal, and pricing reflects that.