4. Don’t leave the curtains on all day long
Especially during your free days, this seems like a good idea, especially if you want to spend more time sleeping. But keeping your curtains shut all day is the biggest mistake since your house will be chilly. While most of the thick ones keep the room warmer, if you keep the curtains shut, even on sunny days, you will miss out on the outdoor heat.
Don’t forget that above everything else, a healthy environment is given by the sun! Besides the fact that in most states the winter is pretty harsh and you can’t live without indoor heating, the sun is a great source of heat as well. Allow at least 20 minutes per day for the window to be open.
