Using an infrared sauna is straightforward: set the temperature between 110°F and 130°F, sit inside for 20 to 45 minutes, and hydrate well before and after. Unlike traditional saunas that heat the air around you, infrared saunas use radiant heat to warm your body directly, which means the air temperature stays lower while your core temperature still rises. That distinction changes a few things about how you prepare, what you wear, and how long you stay in.
Temperature and Time for Beginners
If you’ve never used an infrared sauna before, start at the low end: 105°F to 115°F for 15 to 20 minutes. This feels warm but manageable, more like sitting in strong sunshine than stepping into a wall of steam. Your body needs time to adjust to passive heating, and beginning conservatively lets you gauge how you respond without risking lightheadedness or nausea.
Over the first few weeks, gradually increase both temperature and duration:
- Week 1: 105–115°F for 15–20 minutes
- Weeks 2–3: 115–125°F for 20–30 minutes
- Week 4 onward: 120–130°F for 30–45 minutes
The minimum effective session is about 20 minutes. Most experienced users settle into 30 to 45 minutes as their standard. Sessions beyond 60 minutes aren’t recommended, and most people find diminishing returns well before that point. If you feel dizzy, weak, or uncomfortable at any time, step out. Pushing through discomfort in a sauna offers no benefit and real risk.
How Often to Use It
For general wellness, three to four sessions per week is the range most often recommended. Beginners should start with two to three sessions per week, spacing them out to give the body recovery time. Once you’re comfortable with the heat, you can move toward four or five weekly sessions if your schedule and energy allow it.
Your ideal frequency depends partly on your goals. If you’re using sauna sessions to support recovery after intense exercise, four to five times per week works well. For stress relief or better sleep, two to three evening sessions per week is often enough to notice a difference. There’s no strict rule here. Consistency matters more than frequency, so pick a schedule you can actually maintain.
What Happens Inside Your Body
Sitting in an infrared sauna triggers many of the same physiological responses as moderate exercise. Your heart rate increases, blood vessels dilate, and you begin sweating heavily. Your core temperature rises by one to two degrees, which activates a cascade of protective responses: your body produces stress-response proteins, releases endorphins, and ramps up circulation to cool itself down.
This process is sometimes called hormesis, where a mild, controlled stress prompts the body to adapt and become more resilient over time. Repeated sauna use trains your thermoregulatory system to respond more efficiently, which is why sessions feel easier after the first couple of weeks. You’ll still sweat just as much, but the discomfort decreases as your body learns to manage the heat.
Hydration Before and After
You will lose a significant amount of water during a session, sometimes more than you realize because the sweat evaporates quickly in the dry heat. Drink at least 16 to 20 ounces of water (roughly two full glasses) after every session. Drinking water beforehand matters just as much. Going in dehydrated makes you more vulnerable to dizziness and heat exhaustion.
A good daily baseline is to drink half your body weight in pounds as ounces of water. So if you weigh 160 pounds, aim for 80 ounces across the day, with extra on sauna days. Plain water works fine for most people, but if you’re sweating heavily or using the sauna frequently, adding electrolytes helps. A pinch of salt in your water, coconut water, or an electrolyte drink can replace the sodium and potassium lost through sweat.
What to Wear
Because infrared saunas warm your body through radiant heat rather than hot air, what you wear (or don’t) affects the experience. Less clothing means more direct infrared absorption by your skin. Many people use the sauna in just a towel or lightweight shorts. If you prefer more coverage, choose loose, breathable fabrics like cotton or bamboo.
Avoid tight synthetic materials, compression gear, neoprene, or anything rubberized. These trap heat against your skin, block sweat from evaporating, and increase the risk of overheating. The goal is to let your body sweat freely and regulate its own temperature. If clothing makes the session feel harder than it should, that’s a sign you’re wearing too much.
Morning vs. Evening Sessions
Both work, and the best time comes down to what you want from the session. Morning sauna use tends to feel energizing. The rise in heart rate and circulation can serve as a gentle warm-up for the day, similar to a light workout.
Evening sessions, on the other hand, pair well with sleep. After you leave the sauna, your core temperature drops over the next 30 to 60 minutes. That cooling signal tells your brain it’s time for sleep, the same mechanism that makes a hot bath before bed effective. If you struggle with falling asleep or staying asleep, a session one to two hours before bedtime is worth trying. The key is giving your body enough time to cool down before you get into bed.
Safety Considerations
Infrared saunas are safe for most healthy adults, but several conditions warrant caution or avoidance. People with cardiovascular issues, including high or low blood pressure and congestive heart failure, should be especially careful because the heat significantly affects circulation and heart rate.
Certain medications change how your body handles heat. Diuretics, beta-blockers, and even common antihistamines can impair your ability to cool down, raising the risk of heat exhaustion. If you take any prescription medication, check with your pharmacist or doctor about heat interactions before starting regular sauna use.
Conditions that reduce your ability to sweat are a clear contraindication. This includes multiple sclerosis, certain nervous system conditions, and diabetes with nerve damage. Sweating is your body’s primary cooling mechanism in the sauna, and without it, your core temperature can rise dangerously.
A few other situations to be aware of:
- Pregnancy: Elevated core temperature can affect fetal development. Avoid sauna use or get clearance from your provider first.
- Acute injuries: Don’t apply heat to a recently injured joint for the first 48 hours, or while it’s still hot and swollen.
- Active infections: Heat can worsen enclosed infections, whether dental, joint-related, or elsewhere.
- Fever: Your body is already overheated. Adding external heat compounds the problem.
- Alcohol: Drinking before a sauna session raises heart rate further and accelerates dehydration. Skip the beer until after you’ve cooled down and rehydrated.
If you have metal surgical implants like pins, rods, or artificial joints, they generally aren’t heated by infrared waves because metal reflects them. Silicone implants, however, can absorb infrared energy and warm up. In either case, stop immediately if you feel pain near an implant site.
Putting It All Together
A typical session looks like this: drink a full glass of water 15 to 30 minutes before. Turn on the sauna and let it preheat (most units need 10 to 15 minutes to reach temperature). Step in wearing minimal, breathable clothing or a towel. Sit the towel on the bench beneath you to absorb sweat. Set your timer. Relax, read, meditate, or just sit quietly. When the timer goes off or you feel ready to stop, step out slowly, let your body cool for a few minutes, and drink another 16 to 20 ounces of water. A lukewarm shower afterward rinses off the sweat and feels great, but isn’t strictly necessary.
The most common mistake people make is doing too much too soon: too hot, too long, too many days in a row. Start conservatively, build gradually over three to four weeks, and pay attention to how you feel both during and after sessions. The benefits of regular sauna use come from consistency over months, not intensity in a single sitting.