Is it chilly at your workplace? Instead of plugging in energy-wasting space heaters to stay warm, take a look around the office. According to the Environmental Protection Agency, furniture fixtures like filing cabinets and even storage boxes often block airflow from vents. Blocked vents mean warm air can’t heat the office, and can require as much as 25 percent more energy to get air into your office. Simply moving these fixtures away from vents can make a big difference.