Air change
We have already talked about some tips we can implement to keep the house warm: insulation on doors and windows, heat from the oven, and letting sunlight in are some of the most useful ones. But we must not forget something significant: ventilate the house.
Sometimes the need to avoid cold can make us forget to ventilate the rooms, which is necessary to prevent contagious winter diseases. Every day you should open the doors and windows at least for a few moments. You can do it during midday, to avoid the coldest hours of the day.