Yes, 21°C (around 70°F) is generally considered a very good, comfortable, and often ideal room temperature, falling within the recommended range for living spaces (20-24°C) and good for energy efficiency, though personal preference, health, and climate can adjust this slightly, with cooler for sleeping and warmer for vulnerable individuals.
Here's a guide: 21 degrees: Recommended living room temperature. Please note: If you have babies or small children, you should contact your health worker or GP in relation to the required room temperature, as babies need a slightly lower temperature. 18 degrees: Minimum temperature with no health risk.
Creating the perfect room temperature
Professor Jordan says sleeping in a cooler bedroom makes it easier to fall asleep. "The ideal room temperature is about 21 degrees," she says.
According to The Sleep Charity, the ideal bedroom temperature for sleeping is 16–18°C. Anything over 24°C could be too hot and make you restless, while trying to sleep in a cold room with a temperature below 12°C could make it harder to nod off.
In general, the ideal room temperature and your home for both efficiency and comfort fall somewhere between 68° and 76°F. What should the average room temperature be in winter?
Hypothermia can be fatal if not detected promptly and treated properly. Even mildly cool indoor temperatures of 60 degrees to 65 degrees F for an extended period of time can trigger hypothermia. Infants and the elderly are particularly at risk of hypothermia.
For most people, yes. A cooler room supports your body's natural temperature drop, improves sleep quality, and helps you wake up feeling more refreshed. But cooling the air alone isn't enough—you need a sleep surface that actively supports temperature regulation.
There may be drafts and pockets of colder air near the floor; The walls are colder and don't emit the usual amount of infrared radiation, so you lose heat due to your body emitting more IR than it receives; You may spend more time indoors and hence have less physical activity, so your body generates less heat.
Research shows sleep can be disrupted by temperatures anywhere below 65 degrees Fahrenheit or above 75 degrees Fahrenheit. But for most people, heat interferes with sleep more than cold does. Sleep experts believe the best temperature for great sleep is between 68-72 degrees Fahrenheit.
For Australia, the ideal sleeping temperature is generally cool, between 15°C and 20°C (59-68°F), with some experts suggesting 17-19°C for deeper sleep, as a cooler environment helps your body's core temperature drop, facilitating better rest, though personal comfort varies. Temperatures above 24°C can disrupt sleep cycles, so using air conditioning, fans, or good ventilation helps, especially in warmer Australian climates, to keep the room cool enough for quality sleep.
The 3-2-1 sleep rule is a simple wind-down routine: stop eating and drinking alcohol 3 hours before bed, stop working/mentally stimulating activities 2 hours before, and turn off screens (phones, TVs) 1 hour before sleep, helping you transition to rest by reducing stimulants and preparing your mind and body. It's often part of a larger 10-3-2-1-0 rule, which also adds no caffeine 10 hours prior and no hitting snooze (0) in the morning.
Waking up drenched in sweat, even in cooler environments and during the winter, is a sign that you sleep hot. Excessive sweating is your body's way of telling you it's having trouble regulating your temperature. Our body temperature naturally fluctuates throughout the night as we go in and out of REM sleep.
An indoor temperature above 80°F (27°C) can be uncomfortable and may even pose health risks, especially for vulnerable populations like children, the elderly, or those with chronic illnesses. Prolonged exposure to high temperatures can lead to dehydration, heat exhaustion, or even heat stroke.
Recognize the warning signs of hypothermia
Remember that when you see a weather forecast on TV, in a newspaper or on the radio, that anything from 20 degrees upwards is going to be warm, above 25 degrees is hot, above 30 degrees is very hot.
Sleeping in a cold room helps your body produce the hormone melatonin, which promotes better sleep. An ideal room temperature for sleep is between 60 and 67 degrees Fahrenheit. Limiting blue light and avoiding heavy meals too close to bedtime can help you fall asleep faster.
Abstract. Background: Cold ambient temperatures are known to increase blood pressure (BP), but the influence of room temperature remains understudied.
If you have elderly people in your family, the general rule of thumb is that a living room should be 21°C and above. For a bedroom you should be looking at 18°C and bathrooms should be between 22°C and 24°C.
The optimum home temperature in the UK is between 18°C to 21°C 1, and heating your home above this temperature could have a negative impact on the environment and your energy bills.
How to tell if your house is poorly insulated
Cold homes contribute to excess winter mortality and morbidity. Most of the health burden can be attributed to both respiratory and cardiovascular disease, especially for older people.
In Japan, it is standard practice to heat only the living room, rather than heating the entire apartment or house, as seen in Europe and America. It is not common to heat the bedroom in Japan. As a result, average bedroom temperatures are much lower in Japan.
A cooler room helps your core body temperature drop, which tells your brain it's time to rest. This natural signal can help you fall asleep more quickly and reduce restlessness at bedtime. You may stay in deep sleep longer. Overheating can disrupt your sleep cycle.
This may vary by a few degrees from person to person, but most doctors recommend keeping the thermostat set between 65 to 68 degrees Fahrenheit (15.6 to 20 degrees Celsius) for the most comfortable sleep.