But we still have some windows open. I like the fresh air.

I feel cut off from the outdoors once the windows close, so I keep mine open if it's above 60 during the day!

but i would keep my windows cracked until it dropped below freezing if my husband let me have my way. my husband closes them up when it drops below 55-60 at night.

I consider one of the pleasures in life to have the bedroom at 55-60 and twenty two blankets on the bed!

She's 82 and loves the fresh air.

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... set back pretty deep in the woods on 8-ft tall posts wit a little creeklet running
underneath it. It was truly an idyllic location/existence.
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Our kingsize waterbed was too big for the bedroom, so we had it out in the front
living room. The front wall was all glass, so in the green months, we could see birds
flying around outside and in the winter skeletal-tree months we could see the stars.
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We had a thick faux-bearskin blanket on the bed. We'd turn the house heat way down
and the mattress heater way up. We would be like two warm pieces of toast, though
we could see our breath in the cold air.
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I had to get up EARLY for my work commute and it was a definite incentive to keep
moving and keep moving FAST!!!
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And, along with us being young and very much in love, that ambient temperature made
for a LOT of, um... snuggling.
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Even then I might crack a window to get fresh air. Absolute temp when I close windows for good it below 10°F

I would rather have fresh air, a quilt and my sweetie.

At least in buildings that have steam heat. In such buildings, the heat is always cranked up well into the 80s for some reason known only to the FSM. Windows stay open year-round; fans have even been deployed in the frigid depths of January!

My bedroom window will be open when there's snow on the ground and it's below freezing day and night. I find a cold room helps me to sleep. If I have to sleep in a room with the window closed I always wake up with my head feeling like it's been stuffed with cotton wool.

Depends not just on temp,,but also wind and humidity.

Sometimes in the dead of winter I open the windows just for a few minutes if it's below freezing, trying to get some fresh air in the house.

I like it cool at night.
I live with other people and we have electric heat. I haven't turn on the heat in my bedroom in 8 or 9 years.

i leave it open all summer, which allows the cats to come and go as they wish - there's a little cat door on the porch. I'm going to have to close that window tomorrow, so the cats will be confined to the cat door at the back of the house.

At school, I keep the windows open all winter. The rooms are over-heated and over-crowded. I tell the kids it's so the germs can get out.

I'm leaving the bedroom window open, though.

where my roommate and I didn't control the thermostat so we had to leave the windows open all winter because the university had set the temperature building-wide and we were on the top-floor in the middle. Everybody else had nice toasty dorms; we had a room where if we closed the window, the temperature shot up over 90'F in minutes.

of NYC apartment buildings. I wonder how much energy could be saved if all our institutional buildings had zone controls!

If the sun is out, it's got to be much much cooler outside for that to happen though since my house is a heat magnet.

<60 is great sleeping temperature indoors.

I love it nice and cool but my husband and pets start to huddle if it gets any colder in the house.

My husband can't take the cold at night.

My windows are usually open until it gets to below 40 degrees.

I like cool bedrooms if it is 'naturally' cool, as in, cool outside with the windows open a bit. My husband, however, is a big fan of having the heat on at night, because he tends to throw covers off when he sleeps no matter the temperature.

Yet in the summer, I don't like the artificial cold of having the a/c blowing all night; in the summer, I much prefer just to have the room dehumidified unless it's super-hot outside at night (above 85-90, as it was for a week or two here this summer).

I think my "problem" is that I grew up in SoCal, where it was rarely too hot or too cold, it was always "just right", per Goldilocks' request. For me, just right is somewhere in the 60s-low 80s year round, with a trip to Big Bear or Mammoth if I had a hankering for snow.