That's why the ideal temperature to maintain indoors during winter should be around 68° F , with a humidity level between 50-55%. Similarly, it is not advisable to raise the heating too much , exceeding 77° F: it would negatively impact the quality of life and the health of those who live there.
It's advisable to keep your home below 80 degrees throughout the summer. A house that's too warm can be dangerous to people, pets, and the soft surfaces in your home. Set the winter temperature to 68 degrees when you're awake and 62 degrees when you're sleeping.
An influential limit
After an influential study in 2010, climate researchers often use a wet bulb temperature of 35 degrees C — roughly equivalent to 95 degrees F at 100% humidity — as an upper limit for human survival and adaptability without cooling.
In general, 80 degrees is too hot for a house if people are inside. However, if people aren't home during the day or for vacation during the summer, an indoor temperature of 80 degrees can save energy until you return and lower the temperature.
Setting your air conditioning to 72°F is generally considered a comfortable indoor temperature for many people. It strikes a good balance between comfort and energy efficiency, making it a popular choice for residential settings.
For many of us, 70 degrees is the ideal indoor temperature, but when it is close to 100 degrees outside, your AC unit will be working quite hard to meet these expectations. Consider setting your thermostat at 75 degrees to 80 degrees in your home if the outside temperature is approaching triple digits.
If it's just you and your spouse, you may be fine with the temperature set at 75-77. But if you have kids and pets running around, or you're cooking and using your oven, these things can all raise the indoor temperature noticeably. So, you might find a temperature setting in the 72-74 range more comfortable.
They found a 5-to-10 percent drop in sleep efficiency when indoor temperatures rose from 77 to 86 degrees, he said. “The consensus among most scientists is that anything higher than 75 or 80 is bad for sleep and potentially detrimental to health,” Baniassadi said.
The Safest Temperature for Humans and Pets
Heat can be dangerous, so you don't want to let your home get too hot. The absolute highest you should set your thermostat is around 82 degrees Fahrenheit.
The recommended rule of thumb for summertime is to set the temperature to 78 degrees Fahrenheit when you're home and higher when you're away. In general, set it to 82 degrees Fahrenheit when you're asleep and 85 degrees Fahrenheit when you're away.
For most people, the temperature in the bedroom at night should not exceed 72 degrees Fahrenheit, and it should be even lower for people that sleep best in a cool bedroom.
Roughly 1.3 billion years from now, "humans will not be able to physiologically survive, in nature, on Earth" due to sustained hot and humid conditions. In about 2 billion years, the oceans may evaporate when the sun's luminosity is nearly 20% more than it is now, Kopparapu said.
A core body temperature of 104 degrees Fahrenheit (40 degrees Celsius) or higher is the main sign of heatstroke. Change in mental state or behavior. Confusion, agitation, slurred speech, irritability, delirium, seizures and coma can all result from heatstroke. Change in sweating pattern.
A wet-bulb temperature of 35 °C, or around 95 °F, is pretty much the absolute limit of human tolerance, says Zach Schlader, a physiologist at Indiana University Bloomington. Above that, your body won't be able to lose heat to the environment efficiently enough to maintain its core temperature.
Optimizing Thermostat Settings
The DOE recommends a temperature range from 68 degrees up to 72 degrees. If elderly persons are residing in the house, many sources recommend higher temperatures — up to 78 degrees.
People who live with long-term health conditions are more vulnerable to the effects of heat, including cardiovascular conditions and diabetes – with the temperature in their homes making it much harder to manage their health.
The World Health Organization recommends a thermostat setting no lower than 68 degrees while you're home. If you have children or seniors in your house, that number increases to at least 70 degrees. If your house is too cold, it can cause problems with blood pressure and circulation, as well as affect your heart rate.
“Pipes can expand in high temperatures, leading to leaks or even bursts, especially in older systems. And when it comes to electricity, the increased power consumption during hot spells can overload your system, potentially causing circuit issues or, in worst-case scenarios, electrical fires.”
According to these federal guidelines, during the summer you should set your thermostat at 85F during the day when no one is home. They also recommended setting your thermostat at 82F at night.
Keeping in mind both energy efficiency and comfort, the best thermostat settings for summer are 76° when you are home, 80-85° when you are away and 72° at night. Then use ceiling fans in the rooms you are in to feel up to 4* cooler. Here's more on why these thermostat settings are the best.
When possible, set your thermostat to at least 78º F in the summer to reduce the difference between outdoor and indoor temperatures as much as possible. You can save six to eight percent on your electric bill for every degree your thermostat is raised above 78º F in the summer, according to Smart Energy.
If the temperature is set to 74°F but the thermometer shows 78°F, you will have to recalibrate the thermostat to account for this 4-degree deviation. Even with older AC units or furnaces, you might have to recalibrate your thermostat from time to time.