Don't forget outside maintenance on you A/C. Their purpose is to gather up the heat inside and dump it outside. If the coils and fins are clogged with dirt they can't dump the heat which brings down the efficiency of the unit and works it harder.
One other tip, if you don't have an surge suppressor/ems unit installed, get one, permanent or at the pedestal type. Not only will it protect your a/c unit(s) from surges and low voltage situations but also all the other sensitive electronics like your TVs and microwave.
2014 Sportscoach Cross Country, 361BH