The ideal temperature for a house in winter depends on personal preferences, but there are some recommended guidelines to follow. According to the Department of Energy, the ideal temperature for a house in winter when youre at home is around 68 degrees Fahrenheit (20 degrees Celsius) . The National Renewable Energy Laboratory found that residents preferred a wintertime heater setting between 67 °F and 70 °F (19 °C to 21 °C) . However, the temperature can be adjusted to your familys comfort level. If someone is cold-natured, they can put on a sweater or pair of sweatpants. If that person still isnt comfortable, then the room temperature can be turned up to meet their comfort level in conjunction with everyone else who might not want to be that warm. The temperature can be lowered a few degrees when youre sleeping to save more energy, as youll be under the blankets for extra warmth. A common recommendation is to set the heat to 62 degrees Fahrenheit (16.5 degrees Celsius) for the best energy efficiency when youre sleeping, but if thats too chilly, aim for no higher than 66 degrees Fahrenheit (19 degrees Celsius) . Its important to avoid excessive heating (over 72 °F or 22 °C) as it will waste energy and give you a high utility bill. Heating to higher temperatures also lowers the relative humidity (RH) in your home, which dries out everything from your skin to the wood on your floor.