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How many degrees should air conditioning and heating be set in winter?
How appropriate is the heating temperature of air conditioner?

The indoor temperature should be controlled between 18-20℃ in winter. People will feel warmer at this temperature, because people wear more clothes in winter, so they won't feel cold at 18-20℃. When the room can't reach the set temperature due to poor thermal insulation or excessive indoor area, as long as people don't feel very cold in the room, the temperature of the air conditioner can be raised appropriately.