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.
this post was submitted on 20 Apr 2025
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~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.
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.
Thanks!
I just open the windows , so outside temp , wich ranges from -10 to +25 °C
I'd prefer something like 68-70F (20-21C) at night, but something more like 73-75F (23-24C) in the day
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.
This comparison makes Celsius look even harder to use hahaha.
Only 10 degrees between 68 and 86? That's either a very nice but chilly day or a hot day
Where I grew up it was between 20 and 30 much of the year. Honestly a 10 point warmness scale is quite easy to adjust to.
I have heard farenheit defenders point out that we're not water - that farenheit cares about the temperatures that humans care about
We are not water.
But the weather is.
"The Weather" has never come close to 100C. "The Weather" is rarely below -17C and rarely above 37C: 0F to 100F
"The weather" makes far more sense in F than C.
Cooking makes sense in Celsius. We are regularly concerned about freezing and boiling when we are cooking.
“The Weather” is rarely below -17C and rarely above 37C: 0F to 100F
Tell me you've lived in very narrow portions of the world.
While obviously I've never hit 100°C in weather, I have hit 50.
In both directions from 0.
Wow. That's hot. And cold. I am suitably impressed that you've experienced temperatures that most people will never see.
The 50 came from a heat wave here in Wuhan. (It routinely goes to 45 here, so 50 is a hot day surrounded by pavement in the sun.)
The -50 came from living in the high arctic. One day only, ever. But -40 was pretty normal.
I'm born and raised in the US, so I grew up on Fahrenheit, but switched my phone to Celsius about 10 years ago because I wanted to better understand the scale and have stuck with it ever since. I really don't need to know the exact temperature when I check the weather, just an estimate of whether I should dress for "hot", "cold", or "mild". One of the "tricks" I heard early on was similar: 0°C is freezing. 10°C is cold. 20°C is comfortable. 30°C is warm/hot. 40°C is fucking hot.
I can honestly say that I can only tell apart differences of 1 °F in the context of pools. With air temperature there's humidity, wind, and sunlight that all contribute to the experienced temperature in ways that can make two 68 degree days feel entirely different.
And in the context of pools, "0.5" is a thing if it really bugs you.
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
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
Whatever the room temperature is. If I'm cold I add sheets and if I'm warm I remove sheets. Easy and inexpensive
About 17 degrees. Seems to be the sweet spot to keep my Cavalier snoring speed as low as possible without her getting cold.
- 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.
I'm knocked out at anything above 27 and uncomfortable living in a 16 degree room. I don't know how people are able to handle some of those extreme temperatures
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.
Right now I have it at 24c and that's comfortable. During peak summer I have it set to 26c and I wish I could go a little lower...
Uff. 28c sounds tough. How do you sleep? I wake up sweating without any blankets at 26c. Do you have windows open? Fans?
No, I wouldn't heat with the windows open. All windows are shut. I don't sweat in my sleep and usually sleep under a thick blanket. I'm just terrible in the cold.
I'm technically originally from Russia but summers where I was are like 30c+ and in the winter it's usually very toasty indoors. It'll never not shock me that Europeans tolerate such cold indoors, especially the UK which due to the wind and humidity feels colder in spring than eastern Europe in deep snow winter.
What are you a lizard? 28c?
Yeah? I'm not moving when I sleep so I need to get heat somehow.
69 dude!
Yes. 20-21 is a good temperature range for sleep.
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).
I'd like to keep it at 15, but my room refuses to cool down any further than 20C even with the window open.
Celsius *2, subtract 10%, add 32.
68F in the winter, 72F in the summer
I’d personally go lower in the winter, but the rest of my family disagrees
I do 65F in winter and 72-75 F in summer... but I hate paying electric bills...
Exactly the same for me.
25-25.5° With no fan running, up to 26 with a fan running
Simple conversion system:
- proper temperatures to American moon units: https://duckduckgo.com/?t=ffab&q=25C+in+F
- American moon units to proper temperatures: https://duckduckgo.com/?t=ffab&q=77F+in+C
Either copy the URL and change the temperature (25C or 77F) to your target, or click on the URL and change the input field.
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.
I don't care, I'm asleep.
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.
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.
Most of the year I just leave the window open. But in peak winter/summer I keep it around 21/19 respectively
I don't know but it's too hot for me and too cold for the wife. A perfect compromise.
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.
Around 17°C in the winter, as cool as I can reasonably get it in the summer, usually about 27°C
28°c if possible, it's been 29/30°c high humidity recently.
Yikes, that's high.
Equator, nothing much we can do.
Whatever temperature the outside air is except in the summer when it gets obnoxiously hot and humid, at which point I put a cap of 25°C on the temperature.
So last night it started around 24° at nightfall and fell to 21° in the wee hours.
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