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You'll see a lot more white roofs in hot countries than cold ones. Can't repaint just for the summer here in Canada :-)

• goda90 8y ago
  It'd be interesting if we saw an e-ink like tech that can switch the color of paint with a single electrical signal and not need to stay powered the rest of the time.
  • opportune 8y ago
    or the ink could change color based on temperature/light exposure
    • goda90 8y ago
      It'd be tricky to get it just right on a sunny but cold day. You'd want it dark to absorb more sunlight, but that absorption makes it get warm despite the cold air.
      • Moru 8y ago
        The 40 cm thick snow cover would probably negate the effect.
• bluGill 8y ago
  Cold climates generally have insulation meaning roof color isn't as significant as in warmer climates. Also cold climates also imply snow which brings us back to a white roof.