depends. It happens in nature. But yeah, obviously if you are talking artificially taking the temperature down to freezing using a freezer, then yes, it does require a lot of energy. (However, Energy Star appliances are starting to cute down on the amount of energy used)
Actually, energy is taken out of water when converting it into ice, so the water itself requires a negative amount of energy, which is dependent on how much water is being frozen and how high its initial temperature is. In order to take out the necessary amount, the water needs to be put into an environment which can absorb the water’s energy without heating to a temperature above 32 degrees fahrenheit.
In the home, as keithplya9 pointed out, such an environment would be the freezer. Freezers are pretty well insulated, so if the door is not opened, they will not need much energy once they have cooled down to their operating temperature. If you consistently put buckets of hot water into the freezer, it would require much more energy to keep the compartment cold. You can usually hear your freezer’s compressor kicking in every now and then (as a tick or hum) to regulate the temperature. On average, refrigeration accounts for 8% of home energy use.
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