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6 sourced facts about roofing, each with the context behind the number. 4 more are in today's round and appear here after it closes.

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Going deeper

In homes without air conditioning, how much can cool roofs lower maximum indoor temperatures?

Answer1.2–3.3°C (2.2–5.9°F)

In cold, snowy climates the winter "heating penalty" is usually offset by summer cooling savings.

Source: U.S. EPA, Using Cool Roofs to Reduce Heat Islands epa.gov

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