The job is relative quick and painless in part because of the exposure to goodly amounts of sunlight. The house faces east, illumination thereby pleasantly floods several rooms every morning. I'm also happy to report that its easy because we've made a lot of improvements since we bought the place a decade ago. Better insulation, energy-efficient lightbulbs, new doors and windows, and other incremental changes mean fewer panels needed. Thanks to OPower's partnership with our utility (Pepco) we can tell how much less energy we use than comparable homes. Below is a recent grade we got from this partnership. Strangely - but predictably according to the behavioral science research - my family finds the double-smiley-faces gratifying.