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In winter, indoor temperature affects comfort and heating costs. Adjusting the thermostat based on daily activities can prevent unnecessary energy consumption. The 21-18-16 rule suggests 21°C during the day, 18°C at night, and 16°C when the home is unoccupied. Ideal temperatures vary by individual needs, especially for vulnerable groups. Setting the thermostat too high does not speed up heating. Efficient habits include short airing, avoiding covering radiators, and ensuring windows and doors are sealed. Maintaining a consistent temperature tailored to your schedule can help reduce heating bills.