Each degree you lower in the winter (until you hit 68 degrees) could lower your bills by 3%.
And all you need is your vacuum, a long brush (like this one, $11.44 on Amazon), and someone to help you move your fridge.
This job's relatively simple: floor/ceiling vents can go in the dishwasher, and you can vacuum your intake (but if the intake still looks dusty, unscrew it and wipe down both sides with a soft cloth + all-purpose cleaner).
This surge protector has a remote switch that you can hang on your wall next to your light switches, so it's *easy* to remember to switch off.
The more you heat up your home = the more the AC has to work to keep it cool = the higher your bills.