From Smoke Huts to FireLight®: The Evolution of Sauna for the Modern Age

Thinking About Getting a Sauna? Start Here.

Thinking about getting a sauna but not sure where to begin? You’re not alone. Saunas have been used across cultures for thousands of years, but the modern landscape is dramatically different—and often confusing.

Today, you’ll find everything from traditional steam rooms and dry electric boxes to infrared panels and next-generation home setups. Some promise detox. Others focus on stress relief or weight loss. But which sauna truly supports deep cellular healing, detoxification, and long-term vitality?

That’s what this guide is here to answer.

We’ll walk you through the full landscape—from global traditions and the science of heat therapy to the critical differences between far-, mid-, and near-infrared saunas. And we’ll introduce the SaunaSpace FireLight® Spectrum: a full-spectrum, incandescent, zero-EMF light-and-heat system engineered for deep tissue repair, immune activation, and whole-body transformation.

Whether you’re navigating mold toxicity, fatigue, inflammation, or simply seeking peak recovery and resilience—this is your starting point.

What You’ll Learn in This Guide

• Around the World: A history of heat and healing
• How Heat Heals: The science behind sauna benefits
• The Infrared Revolution: Light that heats from within
• Meet the FireLight® Spectrum: Full-spectrum light for cellular repair
• Today’s Toxins, Tomorrow’s Healing: Why deep heat matters
• Does SaunaSpace Get Hot Enough? Yes—here’s the science
• Efficiency Meets Ritual: The modern home sauna experience
• Sacred Design, Smart Engineering: What sets SaunaSpace apart
• Start Your Sauna Journey: Choosing the right path for your health

We’ve come a long way from smoke-filled huts, yet the ancient call to sweat, to heal, to glow from within, still burns bright.

A Global Ritual: The Deep Roots of Sauna Culture

Long before "biohacking" entered the lexicon, humans understood the power of heat. From the Finnish sauna to the Native American sweat lodge, from Turkish hammams to Japanese sento, cultures across time and geography have gathered in hot, enclosed spaces to cleanse, heal, and reconnect. These practices were not luxuries; they were fundamental to health, community, and spirit.

The Finnish sauna, one of the most widely studied traditions, dates back at least 2,000 years. In its original form, it was a log cabin with a wood-burning stove and no chimney—just smoke, stones, and ritual. After hours of heating, the fire was extinguished and people would enter, breathing the smoke-imbued air and pouring water over hot stones to produce steam. It was a space for giving birth, healing sickness, and purifying the body.

Today, the word "sauna" is often associated with the electric dry saunas found in gyms or spas, but the lineage runs deeper. The essence of sauna therapy is not just heat—it is transformation.

Sauna traditions were also inherently adaptive. The Roman thermae became centers of urban civic life, while the Japanese mushiburo and Korean jjimjilbang evolved into culturally specific rituals of purification. In Russia, the banya continues to play a vital role in communal health. These were not passive experiences. They were heat-induced states of physiological activation and psychological release.

These practices weren’t fringe—they were foundational. In ancient Greece, bathhouses were public institutions tied to philosophy, medicine, and civic identity. The Ottomans built ornate hammams not just for hygiene but for spiritual purification and social harmony. And in Siberia, the banya was viewed as the “people’s first hospital,” used to treat everything from fevers to grief. Across time, saunas served as both sacred spaces and practical tools—places where illness met ritual and sweat met renewal.

This global legacy reminds us that the human body has always needed heat, not just to survive, but to thrive. It’s no coincidence that sauna traditions have endured. They meet a primal need.

In a world where modern toxins burden our systems in ways ancient cultures never faced, this need is more urgent than ever. Explore how detoxification works—and what happens when it doesn’t.

These rituals may look different now, but the need hasn’t changed. What’s old is vital again.

What Heat Does: The Benefits of Sauna Therapy

Sauna use is more than a relaxing ritual. It’s a full-body intervention. When you expose your body to high heat, you activate a cascade of physiological responses:

• Heart rate increases, mimicking moderate aerobic exercise
• Blood vessels dilate, improving circulation
• Heat shock proteins are triggered, enhancing cellular resilience
• Sweating intensifies, flushing out water-soluble toxins
• Immune response is modulated

Peer-reviewed long-term, large human population studies have linked regular sauna use with improved cardiovascular health, reduced inflammation, decreased all-cause mortality, improved cognition, and lower stress levels [1], as well as reduced risk of dementia and Alzheimer's Disease [2].

This is not anecdotal. This is heat as medicine.

Sauna exposure has also been associated with enhanced parasympathetic nervous system activity, meaning it doesn’t just activate your metabolism, it helps you downshift into deep rest. This dual action of stimulation and recovery is rare in modern wellness tools, and central to why heat therapy has stood the test of time.

One of the most profound responses to heat therapy is the upregulation of heat shock proteins (HSPs), molecular guardians that stabilize damaged proteins and assist in cellular repair. HSPs are vital for protecting cells from stress, and their activation is linked to longevity, neuroprotection, and improved immune surveillance. In fact, studies have shown that heat-induced HSP expression can help protect against Alzheimer’s disease and reduce oxidative damage.

At the same time, heat stimulates mitochondrial biogenesis [3], the creation of new mitochondria, your cells’ energy producers. This enhances your metabolic flexibility and supports everything from hormonal balance to cognitive clarity. When you step into a sauna, you’re not just warming your skin; you’re awakening the engine of vitality itself [4].

Athletes use sauna post-training to reduce muscle soreness and accelerate recovery. People with autoimmune conditions report improvements in pain and fatigue. Even mood and sleep quality show measurable improvements with consistent use. As the body warms, so does the mind.

This cellular activation is also part of the reason why healing and recovery are among the most powerful benefits of consistent sauna use, not just for athletes, but for anyone navigating stress, injury, or inflammation.

Enter Infrared: A New Kind of Heat

Traditional saunas work by heating the air, which in turn heats your body. This can be effective, but it's also inefficient. It requires high temperatures (often above 180°F), long warm-up times, and high energy usage. For some people, the intense heat can be too overwhelming.

Infrared saunas were introduced as a more accessible alternative. Rather than heating the air, they use light to heat your body directly. The technology breaks down into three types:

• Far infrared (FIR): The most common type, often found in commercial infrared saunas. FIR heats the body more directly than traditional air-based heat, but often uses panels that emit weak, scattered wavelengths.
• Mid infrared (MIR): Sometimes added to expand the spectrum, but not especially well studied.
• Near infrared (NIR): The shortest wavelength, closest to visible light, and the most deeply studied for cellular regeneration, wound healing, mitochondrial stimulation, detoxification [5] and anti-inflammation [6][7].

Unlike traditional heat, infrared does not rely on the ambient temperature of the room. That means you can start sweating and detoxifying within minutes, even at lower air temperatures. But not all infrared is created equal.

To understand why we focus on near infrared instead of LEDs or panel-based systems, check out our article LED Light Therapy Is Everywhere. Here’s Why We Don’t Use It. LEDs are ubiquitous for red light therapy because they’re cheap, but that doesn’t mean they’re the best solution.

What Makes SaunaSpace Different: The FireLight® Spectrum

SaunaSpace isn’t just another infrared sauna. It’s an entirely new category, designed to deliver the most healing light and heat possible. Our proprietary FireLight® Spectrum uses incandescent tungsten filament bulbs engineered to peak in the red and near-infrared range, the same frequencies emitted by fire and sunlight.

This is not a narrow-band LED therapy. It’s a full-spectrum incandescent light source that:

• Emits a smooth, biologically aligned curve of wavelengths
• Offers both thermal heat and photobiomodulation (light therapy)
• Penetrates up to 9 inches into the body [8] without discomfort
• Has zero EMF—when properly grounded and shielded, as all SaunaSpace products are

Check out the graph of the FireLight® Spectrum below:

You’re not just sweating. You’re activating your cells.

FireLight® delivers both the experience and the biology of natural light exposure. It engages your mitochondrial machinery, encourages nitric oxide release, and supports circulation and oxygenation at the tissue level.

The result? A more complete form of detoxification, tissue repair, and cellular renewal—without the harshness or inefficiencies of older technologies.

Modern Detox Requires Modern Heat

In ancient times, people were exposed to far fewer environmental toxins. Today, we are constantly bombarded: BPA, phthalates, microplastics, heavy metals, flame retardants, pesticides [9], nanomaterials. Many of these accumulate in fat cells and connective tissue, where they remain locked away—invisible, but not inert. They wreak havoc on our nervous system [10] and all disrupt all biological functions of humans and pretty much every form of life on Earth [11]. In fact, man-made environmental pollution is likely the biggest contributor to disease that we face today [12]. 

To release these deeply lodged toxins, your body needs deep, penetrating heat. This is where SaunaSpace shines. Our spectrum activates a thermal and photonic response that reaches deep into the body, supporting mitochondrial function and cellular detox in a way traditional steam or far-infrared saunas cannot match.

Unlike far infrared panels that scatter heat unevenly and often rely on carbon or ceramic emitters with limited surface area, FireLight® produces focused, radiant warmth that penetrates deeply, up to 9 inches beneath the skin [8], stimulating circulation and detox at the cellular level. Far infrared panels may heat the skin surface, but they often fail to mobilize toxins stored in deeper tissues and organs.

FireLight®’s unique delivery of thermal and photobiomodulation effects simultaneously activates key detox pathways, including lymphatic drainage, mitochondrial repair, and cellular waste removal. And with its zero EMF output, when properly grounded and shielded, as all SaunaSpace products are, you get healing heat without any of the biological noise.

Modern detox isn’t about deprivation. It’s about reawakening your body’s innate systems of repair. Deep, safe, targeted heat allows for just that.

Why SaunaSpace® Works, Even If the Air Isn’t Scorching

Some skeptics wonder: If SaunaSpace doesn’t feel as hot as a traditional sauna, can it really deliver the same health benefits? The answer is a resounding yes—and here’s why.

What matters in sauna therapy isn’t how hot the air is. It’s how your body responds.

The gold standard in sauna longevity research, such as the decades-long Finnish studies referenced by Dr. Rhonda Patrick in Sauna Use as a Lifestyle Practice to Extend Healthspan [13], shows that the key therapeutic benchmarks are:

• An increase in core body temperature of 3°F (about 1.5°C)
• The loss of approximately 1 lb (0.5 kg) of body water through sweat

These aren’t tied to a specific type of sauna—they’re biological outcomes. And SaunaSpace achieves them effectively, often faster than traditional steam or dry saunas.

How? It’s not about ambient air temperature. It’s about radiant heat.

FireLight® uses full-spectrum incandescent light, rich in red and near-infrared wavelengths, to heat your body directly. Unlike convection-based saunas that warm the air and wait for it to heat you secondhand, radiant heat from FireLight® is absorbed instantly by your tissues. That means:

• Faster onset of sweating
• More efficient thermal load on the body
• No need for extreme external temperatures (which can be overwhelming or inaccessible to sensitive users)

You still reach those critical markers of a true sauna session: elevated core temperature, deep sweating, and measurable physiological activation. In fact, because FireLight® also delivers photobiomodulation—a light-based cellular therapy—you get layered benefits beyond just heat: improved mitochondrial function, reduced oxidative stress, and enhanced circulation.

So no, it’s not about hitting 180°F in the room. It’s about activating the internal systems that make sauna therapy so powerful. And FireLight® does exactly that.

Watch our Heat Therapy explainer video:

The Most Efficient Sauna Experience in the World

SaunaSpace was designed for modern lives. No need to preheat for 45 minutes. No energy-wasting rocks. No massive installation or remodeling project.

• Instant-on: Just flip the switch. You’re ready to go.
• Portable: Our saunas fit in apartments, bedrooms, and home offices.
• Comfortable: The heat feels like sunbathing or sitting near a campfire—warm, golden, and nourishing.
• Quick sessions: A full therapeutic session takes just 20 minutes.
• Silent and still: No fans, no buzz, no LED flicker—just a calm, natural-feeling light source that supports deep rest and sensory relief.

This is the evolution of sauna: minimal footprint, maximal effect.

And for those with busy schedules, it’s a game-changer. You can get deep therapeutic benefits in the time it takes to make dinner or prepare for bed. You don’t need a mansion or a renovation budget to integrate profound wellness into your life.

For a look at how our design principles enhance this experience, from posture to rotation, explore Why We Don’t Let You Lie Down: The Science and Power of Rotating in a Firelight® Sauna.

Accessible, Beautiful, and Built to Last

Every part of SaunaSpace is crafted with care. Our materials are 100% non-toxic and thoughtfully selected: sustainably harvested basswood, organic cotton canvas, zero-VOC finishes. The form factor is simple, elegant, and built to integrate seamlessly into your home.

But don’t let the simplicity fool you. The canvas enclosure is more than aesthetic, it’s thermally insulating, creating an efficient, cocoon-like environment that holds radiant heat close to your body. Unlike bulky wooden boxes, which require long preheat times and suffer from heat loss at corners and seams, our tents are lightweight, energy-efficient, and incredibly effective. You get deep, full-body heat, without wasting electricity, space, or time.

Our saunas are designed to go where you go. Whether you live in a tiny apartment or a spacious retreat, your healing space is portable, adaptable, and ready whenever you are. No wood to chop. No contractor. No toxins. Just elemental comfort and daily transformation.

Because we believe healing should be beautiful. And beauty should be functional.

Begin Your Sauna Journey

If you’ve been curious about saunas but overwhelmed by the options, let this be your starting point. SaunaSpace is not only easier to use and more comfortable—it’s more powerful. It brings together the deepest lineage of heat therapy with the most advanced understanding of light, detoxification, and modern health challenges.

You don’t need to be a health guru or a techie to reclaim the wisdom of heat. You simply need a space (and a spectrum) designed with purpose. The beauty of SaunaSpace is that it gives you access to ancient healing in a modern form: gentle, efficient, non-toxic, and beautifully made. Whether you’re recovering from chronic fatigue, supporting detox after mold exposure, or simply craving stillness in a chaotic world, this is a tool that meets you where you are.

And it grows with you. As your understanding deepens, as your cells begin to remember what thriving feels like, your sauna becomes more than a habit—it becomes a return. A return to light. A return to rhythm. A return to the body’s innate intelligence.

And this is just the beginning. To understand the full healing power of light—including how photobiomodulation works, why red and near-infrared light matter, and how our FireLight® Spectrum compares to LED panels—read our next foundational piece: Light Therapy 101: How Red & Near-Infrared Light Heal the Body.

Or if you're ready to create your own healing space, head over to our sauna builder. We’ll walk you through every step, so you can bring ancestral firelight into your modern home.

References

[1] Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Intern Med. 2015 Apr;175(4):542-8. doi: 10.1001/jamainternmed.2014.8187. PMID: 25705824.

[2] Laukkanen T, Kunutsor S, Kauhanen J, Laukkanen JA. Sauna bathing is inversely associated with dementia and Alzheimer's disease in middle-aged Finnish men. Age Ageing. 2017 Mar 1;46(2):245-249. doi: 10.1093/ageing/afw212. PMID: 27932366.

[3] Itami N, Shirasuna K, Kuwayama T, Iwata H. Short-term heat stress induces mitochondrial degradation and biogenesis and enhances mitochondrial quality in porcine oocytes. J Therm Biol. 2018 May;74:256-263. doi: 10.1016/j.jtherbio.2018.04.010. Epub 2018 Apr 24. PMID: 29801636.

[4] Marchant ED, Kaluhiokalani JP, Wallace TE, Ahmadi M, Dorff A, Linde JJ, Leach OK, Hyldahl RD, Gifford JR, Hancock CR. Localized Heat Therapy Improves Mitochondrial Respiratory Capacity but Not Fatty Acid Oxidation. Int J Mol Sci. 2022 Jul 31;23(15):8500. doi: 10.3390/ijms23158500. PMID: 35955635; PMCID: PMC9369322.

[5] Chung H, Dai T, Sharma SK, Huang YY, Carroll JD, Hamblin MR. The nuts and bolts of low-level laser (light) therapy. Ann Biomed Eng. 2012 Feb;40(2):516-33. doi: 10.1007/s10439-011-0454-7. Epub 2011 Nov 2. PMID: 22045511; PMCID: PMC3288797.

[6] Shamloo S, Defensor E, Ciari P, Ogawa G, Vidano L, Lin JS, Fortkort JA, Shamloo M, Barron AE. The anti-inflammatory effects of photobiomodulation are mediated by cytokines: Evidence from a mouse model of inflammation. Front Neurosci. 2023 Apr 6;17:1150156. doi: 10.3389/fnins.2023.1150156. PMID: 37090796; PMCID: PMC10115964.

[7] Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophys. 2017;4(3):337-361. doi: 10.3934/biophy.2017.3.337. Epub 2017 May 19. PMID: 28748217; PMCID: PMC5523874.

[8] Whelan HT, Buchmann EV, Dhokalia A, Kane MP, Whelan NT, Wong-Riley MT, Eells JT, Gould LJ, Hammamieh R, Das R, Jett M. Effect of NASA light-emitting diode irradiation on molecular changes for wound healing in diabetic mice. J Clin Laser Med Surg. 2003 Apr;21(2):67-74. doi: 10.1089/104454703765035484. PMID: 12737646.

[9] Bradman A, Kogut K, Eisen EA, Jewell NP, Quirós-Alcalá L, Castorina R, Chevrier J, Holland NT, Barr DB, Kavanagh-Baird G, Eskenazi B. Variability of organophosphorous pesticide metabolite levels in spot and 24-hr urine samples collected from young children during 1 week. Environ Health Perspect. 2013 Jan;121(1):118-24. doi: 10.1289/ehp.1104808. Epub 2012 Oct 9. PMID: 23052012; PMCID: PMC3553429.

[10] Liew Z, Guo P. Human health effects of chemical mixtures. Science. 2022 Feb 18;375(6582):720-721. doi: 10.1126/science.abn9080. Epub 2022 Feb 17. PMID: 35175805; PMCID: PMC9805352.

[11] Karlsson O, Rocklöv J, Lehoux AP, Bergquist J, Rutgersson A, Blunt MJ, Birnbaum LS. The human exposome and health in the Anthropocene. Int J Epidemiol. 2021 May 17;50(2):378-389. doi: 10.1093/ije/dyaa231. PMID: 33349868; PMCID: PMC8128460.

[12] Landrigan PJ, Fuller R, Acosta NJR, Adeyi O, Arnold R, Basu NN, Baldé AB, Bertollini R, Bose-O'Reilly S, Boufford JI, Breysse PN, Chiles T, Mahidol C, Coll-Seck AM, Cropper ML, Fobil J, Fuster V, Greenstone M, Haines A, Hanrahan D, Hunter D, Khare M, Krupnick A, Lanphear B, Lohani B, Martin K, Mathiasen KV, McTeer MA, Murray CJL, Ndahimananjara JD, Perera F, Potočnik J, Preker AS, Ramesh J, Rockström J, Salinas C, Samson LD, Sandilya K, Sly PD, Smith KR, Steiner A, Stewart RB, Suk WA, van Schayck OCP, Yadama GN, Yumkella K, Zhong M. The Lancet Commission on pollution and health. Lancet. 2018 Feb 3;391(10119):462-512. doi: 10.1016/S0140-6736(17)32345-0. Epub 2017 Oct 19. Erratum in: Lancet. 2018 Feb 3;391(10119):430. doi: 10.1016/S0140-6736(17)32817-9. PMID: 29056410.

[13] Patrick RP, Johnson TL. Sauna use as a lifestyle practice to extend healthspan. Exp Gerontol. 2021 Oct 15;154:111509. doi: 10.1016/j.exger.2021.111509. Epub 2021 Aug 5. PMID: 34363927.