Instead of incandescent lighting that use a lot of energy and burn out quickly look at fluorescent or LED lighting instead.

Fluorescent light bulbs use 70% less electricity, give 5 times more light, emit 90% less heat & last 10 times longer than regular bulbs. You can also choose LED lights that use at least 75% less energy and last up to 25 time longer.
Amt saved: $50-75 in electricity costs over life of bulb.

A home with inadequate attic insulation can lose as much as 40% of its cool air. Because heat rises, as much as 60% of heat can be lost in the wintertime in poorly insulated homes.