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Submitted by: Robin Green

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There are situations where your idea will save energy, but don't forget that the heat inside that oven will eventually escape out of the oven and into your kitchen even if you don't open the oven door after baking or roasting. Opening the oven just lets the heat out faster. This will help if you would otherwise be turning up the thermostat for the whole house because it's cold inside, but are staying in the kitchen, and the heat from the oven helps you delay or avoid turning up the thermostat. But because of the first law of thermodynamics, which states that energy can be transformed, but cannot be created or destroyed, you really don't save energy using this technique in most cases, because the heat from the oven will make its way out either suddenly, or over time. In fact, in a house that is not perfectly insulated (that is, every house in the real world) the hotter the kitchen gets as a result of opening the oven, the faster the heat will escape through walls to the out of doors (because a greater heat differential leads to a faster heat transfer). Therefore, leaving the oven door closed is probably the better energy saving approach. Robin from Green Energy Efficient Homes

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