Shut the Windows.
Sounds simple enough. But the phrase, “What, do you live in a barn?” Keeps popping into my mind as a see the girls leaving the doors open. The other biggie is closing and latching the window, thus creating the seal that keeps the heat in and the cold out. If you have not done so already now is the season to remove screens, add the storms and close tight the windows. So just as you should open the windows in the good weather don’t forget to shut them in the foul.