| Cost | Savings | Action |
| Free! | $ | During winter, shut the windows tight and use window film to improve insulation and protect against drafts. Keep the shades/blinds open during the day to let sunlight in; close them at night. |
| Free! | $ | During summer, keep windows and shades closed during the hottest parts of the day to keep the sun out and open at night to let the cool breezes in. |
| $ | $ | Caulk the windows to prevent air leaks |
| $ | $ | Replace with more energy-efficient windows |