16-18C is probably best. Love curling up in the duvet in the cold, but cold normally means damp too ☹️

Sleeping above 25C is miserable.

If you don't need to be super accurate:

• C to F: double then add 30
• F to C: subtract 30 then halve it

I like the room cold for sleeping. 60F (15C) is ideal, but we can't get that cool in the summer.

I just open the windows , so outside temp , wich ranges from -10 to +25 °C

The easiest way I find is to memorize the 0/10/20/30C to F conversions, then plus/minus at 2 to 1 from there.

32 = 0 50 = 10 68 = 20 86 = 30

70F is ~21C, 54F is ~12C, 81F is ~27.5C.

Whatever the room temperature is. If I'm cold I add sheets and if I'm warm I remove sheets. Easy and inexpensive

I usually set the thermostat to 28c or so, but I doubt it gets there, I get a sore throat at night if it's cold and I end up being miserable and spending way too long in bed the next day.

It goes as low as 10°C / 50°F in winter. I've programmed the radiator valve to give some heat (14°C/57°F) before going to bed and waking up. We have 2 duvets with flannel sheets, and a fleece bedspread on top. Today it's 17°C/63°F. Just one single duvet, time for regular cotton sheets, flannel ones are getting uncomfortably warm. As soon as it's about 10°C outside we'll leave the window open all night. We have a large frame with a mosquito screen and live in a very peaceful neighborhood. For summer, just a cotton sheet, that will probably be left down the feet most of the time. On holiday with sometimes 30°C the whole night, we basically cannot sleep, the confortable limit for us is close to 26°C - but it's more related to humidity than temperature

The two formulas are:

F=(C x 1.8)+32

C=(F-32)/1.8

If you think about the formula for converting, it's close to multiplying or dividing by 2. This step is off by about 10% (1.8/2=0.9). So converting from F to C, subtract 32, divide by 2, then add 10%.

For C to F, multiply by 2, subtract 10%, then add 32.

At typical temps, I've found this is usually within a degree, and easy to do in my head (and I have zero working memory).

Fractions...

10C* (9F/5C) + 32F = 50F

Or

10/5=2, 2*9=18, 18+32=50

If you stick to multiples of 5 it's easy:

0C - 32F

5C - 41F

10C - 50F

...

30C - 86F

35C - 95F

40C - 104F

68F in the winter, 72F in the summer

I’d personally go lower in the winter, but the rest of my family disagrees

In a country where thermostats and air conditioners and whatever in your house isn't really a norm. So like other answers here, just whatever temperature. And I adjust the amount of layers on my bed or that I'm wearing to accommodate. Hot summer nights are the worst.

• 0°C is freezing
• 10°C is cold
• 20°C is comfortable. Roughly "room temperature"
• 30°C is warm/hot
• 40°C is fucking hot

Depending on a variety of factors, I generally like my space to be 18-22°C during waking hours, and maybe 16-20°C for sleeping.

About 17 degrees. Seems to be the sweet spot to keep my Cavalier snoring speed as low as possible without her getting cold.

I don't care, I'm asleep.

~18C but I also like it much colder, but it hardly gets any colder in my bedroom because my partner is always freezing. In summer it's really hard for me, above 22C is uncomfortable.

Celsius *2, subtract 10%, add 32.

25-25.5° With no fan running, up to 26 with a fan running

Around 17°C in the winter, as cool as I can reasonably get it in the summer, usually about 27°C

About 65F to start with, then just before I get into bed, I turn off the heater, because supposedly you sleep better when reasonably cool.

The other comment is right, hot nights are the worst.

Heating and cooling are expensive at our house so we generally let the temp do what it wants so long as it stays between 64F and 80F. The dehumidifier, though, tends to keep it in the upper end of that range during the summer.

Whatever temperature the apartment ends up at 🥲 My cat won't sleep with the windows closed (insane behavior), and I'm not running heat or air with them open.

My ideal is 68°F or around 20°C, but kitty gets whatever she wants.

69 dude!

I'd like to keep it at 15, but my room refuses to cool down any further than 20C even with the window open.

I don't know but it's too hot for me and too cold for the wife. A perfect compromise.

Most of the year I just leave the window open. But in peak winter/summer I keep it around 21/19 respectively

I keep it at 68 or 20. The easiest way to convert is to take 68 add 100 multiple by 37 then divide by 188.4.

It varies by season. In summer, typically 24 on 'dry' mode to pull out as much humidity as possible. In the winter, on nights that fall below 16 (Japanese homes have shit insulation), I'd set the heater to somewhere between 16-20 depending upon how cold I felt on that particular day. These days (spring), we're not using anything at night, really.

I'd prefer something like 68-70F (20-21C) at night, but something more like 73-75F (23-24C) in the day

28°c if possible, it's been 29/30°c high humidity recently.