Asphalt shingle roofs are notoriously inefficient at retaining inside temperatures and reflecting outside heat. Metal roofs however are extremely efficient at both. Studies have shown that having a metal roof has saved up to 40% on energy costs for some homeowners. Certain finishes on the metal panels, often used for warmer climates, will re-emit up to 90% of solar heat absorbed by the panels, assisting in cooling costs.
In addition to reflecting heat, metal roofs are also extremely compatible with solar panels. The addition of solar panels to a metal roof can significantly increase energy efficiency, providing significant savings.