If you want cool crisp air, remember to lower the temperature settings when you open or tilt the window. Leaving the settings up will increase energy waste, since temperature travels from hot to cold areas.
While many enjoy colorful holiday light decorations during the season, many light fixtures are real energy guzzlers. Set a timer or manually switch lights on and off from about 5 p.m. to max. 10 p.m. to avoid unnecessary energy consumption late at night.