Looking for ways to lower my electric bill

[randr]

4. The best investment you could make is more insulation

Check your attic, if you have one to see if more can be added. If you have exposed stem walls or slab edge outside, they can be insulated on the exterior. Windows are now much more efficient, but replacements come at a high price.
Seal all gaps, replace door seals and thresholds if needed. Adding additional insulation to walls requires new siding.
There are services that will provide thermal evaluations in most states and give you the best alternatives for you situation.
I had a company blow in an additional 6" of insulation in my attic, that came with rebates and tax deductions. It worked!