Set your thermostat to 17-21°C
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Category: Home Efficiency
By programming your thermostat to reach a high of 21°C during the day and 17°C while you're away from home or sleeping, you could save about 2% on your heating energy consumption every month. It's that simple.
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All you need (and probably already have) is a programmable setback thermostat. Program it so that your temperature reductions start before you go to bed and end before your alarm goes off in the morning.