I closed the windows when it was colder than -10 (Farenheit),
this winter, otherwise they stay open a little, (an inch or less),
most of the time.
I admit to having the heat on while the windows are open.
Have you ever experienced that sleepy, groggy feeling
inside any building without oxygen?, be it sitting by a roaring fireplace
with no fresh air coming in,
or a large office building filled with dead-air. (too much carbon dioxide)
Edit: Just saw your post,
good luck with the cleaning,
Spring is just around the corner!
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