You argue, but nobody ever wins. It can feel like debating whether Christmas is more awesome than Halloween. You’re talking about personal preference, right? To some degree, sure. Men and women are built differently, and they have very different ideas about what constitutes a “comfortable” temperature. MORE: 5 Scientific Reasons to Sleep Buck Naked You probably notice it at the office. If somebody is complaining that it’s too cold, it’s probably not a guy. And there’s a reason for that. A study released earlier this month—by researchers at the Maastricht University Medical Center in the Netherlands—found that many modern office buildings follow a “thermal comfort model that was developed in the 1960s.” The temperature is based on the metabolic rate of an average 40-year-old man who weighs 155 pounds. Women in general have lower resting metabolic rates—they aren’t producing as much body heat when they’re sitting behind a desk as men are. So a temperature that men think is perfect for the work environment is cold enough to have your female colleagues reaching for their sweaters. And that’s just at the office. At home, in your bed, when neither one of you wants to be shivering or sweating, finding a happy middle ground becomes more vexing. Rachel Salas, MD, a neurologist at Johns Hopkins University who specializes in sleep medicine, cites a National Sleep Foundation study that puts the magic number at 65°F degrees. Why so low? Your body’s core temperature is naturally low during deep sleep. It starts to increase toward the end of your sleep cycle, as a sort of signal to your body that it’s time to wake up. By keeping the temperature low, you’re helping your body do its job. Too hot and it can interfere with your body’s natural temperature adjustments and create restlessness throughout the night. That’s a recipe for insomnia. But 65°F is just a ballpark number. “Most of us tell patients to try between 65°F and 69°F,” says Salas. “Personally, 68°F works for me.” And then there’s the matter of your electricity bill. Will you save money by giving the thermostat a break overnight? MORE: The Best Sleep Positions Mike Bieschke is a controls system design and support specialist for Minvalco, a Midwest-based climate engineering firm. Put simply, his job is to consider a building’s overall size and volume during construction or renovation—anything from a house to a Walmart—and calculate how much climate control is necessary to keep it livable. Bieschke says that during the summer, you should keep your A/C within a tight range. If 68°F is your comfort zone, don’t go too far above or below that—only a couple of degrees in either direction—even when you’ll be asleep or away from the house. Why? “In a cooling system, the compressors use more energy when they start, compared to when they run,” he says. You’ve seen the lights flicker in some places when the A/C activates. That’s because an A/C compressor kicking in takes a big punch of electricity. If you force your A/C unit to work toward a sudden change in the morning or when you come home from work, with the initial oomph of getting the freon squeezed, it’s going to take a big chunk of energy. And that means bigger electric bills. But when winter comes—and it’ll be here soon enough—the rules change. Lowering your thermostat by even a few degrees can save you bucks. You don’t have to get ridiculous—it shouldn’t be so cold that you’re wearing a down jacket to bed—but if your temperature is set at 70°F, bringing it down to 67°F or 66°F at night will definitely cut your heating costs. The US Department of Energy recommends turning down your thermostat 10 to 15 degrees for 8-hour stretches, which admittedly sounds a little nuts. If you like it at 70°F, you’re probably not going to want to sleep in a bedroom that’s just 55°F. But according to the government agency, you can save as much as 1% on your monthly heating bill for each degree you lose. That’s reason enough to put on warmer pajamas and tough it out. The article The Best Room Temperature for Sleeping originally ran on MensHealth.com.
