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Properly adjusting the radiator thermostat helps maintain a comfortable home temperature and reduces energy waste. Experts suggest starting with setting three for most rooms and adjusting based on comfort. In bedrooms, settings two or three are recommended for a comfortable sleep temperature. The main thermostat should be set to a comfortable level, typically between 18-21 degrees Celsius. Avoid setting all radiators to maximum; instead, adjust each room according to usage and outside temperature. Proper insulation and avoiding covering radiators can also enhance heating efficiency. Ultimately, there is no one-size-fits-all setting, but starting with three is often effective.