Q - I’ve always slept with my bedroom window open a crack for fresh air. How much heat am I losing in winter? Are there other ways to keep the air fresh?

A - The short answer is yes, you’re losing a lot of heat — the colder it is outside, the more you’re losing. Indeed, all your efforts at draftproofing and double-paning windows is for naught if you don’t keep windows closed in the winter.

So what can you do to keep the air fresh? You can improve indoor air quality by keeping the room – including closets and under the bed – clean and free of dust. Houseplants will increase oxygen levels. Allow air to circulate during the day by keeping your bedroom door open to the rest of the home. And if you must open the window, do it for a short time in the afternoon on a relatively warm day.