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The fridge is trickier, but for your freezer fill a small plastic cup with water and let it freeze. Then place a penny on top of it. If it gets warm enough for

• Afton 7y ago
  Put a bottle water in the freezer until it's frozen. Turn it on it's side. If you notice the ice-air line isn't vertical, you had a warming event.
  • ndjskska 7y ago
    There are heat-sensitive stickers that change color if above some threshold. It's on packaged meat in Norway I believe.
    • roland35 7y ago
      that would be a good single use solution, we generally only a long power outage once every few years so that could work.