Light vs. Dark: Understanding Solar Reflectance

Exterior color affects how much sunlight your home absorbs or reflects. Light colors, such as whites and light grays, reflect more sunlight, keeping interiors cooler in the summer. Dark colors absorb heat, which can be beneficial in colder climates by retaining warmth.

What the Research Says

Several studies have shown the impact of color on energy efficiency:

• Roof Color and Energy Use: A study in Frontiers in Mechanical Engineering found that dark roofs absorbed heat efficiently, while lighter roofs reflected more sunlight, affecting energy usage. Read the full study.
• Exterior Paint Colors and Efficiency: Research by M. Sari and K. Aksoy showed that facades with reflective, light colors kept interior temperatures lower and reduced energy consumption. Read the full study.
• Cool Walls and Energy Savings: The Lawrence Berkeley National Laboratory found that solar-reflective paints on exterior walls could save 4–27% on energy costs depending on the climate zone. Read the full study.

Choosing the Right Color for Your Home

Selecting the best exterior color depends on your climate and energy goals:

• In hot climates, opt for lighter colors to reflect heat and reduce cooling costs.
• In colder regions, darker colors may help retain warmth during winter months.
• Consider advanced paint technologies that enhance reflectivity or insulation for additional energy savings.
• Factor in your home’s orientation to sunlight when choosing colors for walls, roofs, and trim.

Practical Tips for Energy-Efficient Exterior Colors

• Consult professional color experts to match energy efficiency goals with aesthetic preferences.
• Use reflective roof or wall coatings when appropriate to enhance solar reflectance.
• Balance your home’s design, surroundings, and neighborhood aesthetics with energy-efficient color choices.