Setting the room temperature to 20-21°C is usually adequate. Recommended night-time temperature is 16-19°C. It is advisable for babies to sleep in a room of 18°C. The temperature shouldn’t drop below 16°C for elderly people and those with impaired mobility.
Source: Central heating controls | Boilers: Boiler and heating controls @ Which?
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- Thermostats and controls @ Energy Saving Trust
Excerpt: Your room thermostat should be set to the lowest comfortable temperature – typically between 18°C and 21°C.
Image by Bios (talk · contribs) [GFDL or CC-BY-SA-3.0], via Wikimedia Commons
