Sauna Buyer's Glossary

The long-wavelength infrared that carbon panels emit in most home cabins — Dynamic's FAR series, Maxxus, and the far-infrared side of Golden Designs. Far infrared penetrates roughly 1–1.5 inches into muscle tissue rather than heating the air, so sessions run comfortable at a 120–140°F cabin temperature instead of the 180°F-plus of a traditional room. It's the “low-and-slow, longer-session” heat most first-time buyers actually want.

“Full spectrum” means a cabin adds near- and mid-infrared emitters alongside the far-infrared carbon panels, covering all three infrared wavelengths in one room — Dynamic's Martin and Santorini, and Golden Designs' full-spectrum line. Near infrared is the short, high-intensity wavelength associated with skin and surface-tissue claims. A full-spectrum cabin costs more than a FAR-only cabin of the same size and is the pick for buyers who specifically want near-infrared, not just more heat.

A large, flat heating element that emits infrared across its whole surface, so heat is distributed evenly with no ceramic-style “hot spots” against your back. Every cabin we carry uses carbon rather than ceramic rod heaters; Maxxus brands its carbon system 360 PureTech™. Carbon's even-heat surface is why you can sit comfortably against the cabin wall, and it's a genuine build-quality difference from cheap ceramic-element cabins.

A traditional sauna heats the whole room to 180–195°F with an electric heater and a bed of rocks; Löyly is the burst of steam you get by ladling water onto the hot rocks. Sessions are shorter (15–30 minutes) and the heat is far more intense than infrared. Traditional cabins almost always need a hardwired 240-volt circuit — the classic experience, at a higher build and operating cost.

A cabin that combines carbon infrared panels with a traditional rock heater in the same room, so one user can run a low-temp infrared session and another a high-heat steam session — Golden Designs' GDI hybrid line is the flagship here. It's the most flexible (and most expensive) format, and like a traditional sauna it needs a 240-volt circuit. Best when multiple users want different session types under one footprint.

The Finnish rock-heater brand used in the traditional and hybrid cabins. When a listing mentions a Harvia heater, the cabin does true steam/Löyly, not just infrared, and it will require a 240-volt hookup. Harvia heaters carry their own UL875 heater certification, which is the compliance document to ask for on a commercial hybrid install.

Electromagnetic field emitted by the heaters, measured in milligauss (mG). The number is meaningless without a stated measurement distance, because readings fall off sharply the farther you sit from the panel — an “ultra-low EMF” claim measured at three inches can read much higher at seated position. Maxxus is the line built around this: its standard low-EMF panels are documented at ≤8 mG at 6–8 inches from the heater and its ultra-low and full-spectrum panels at ≤2 mG at 2–3 inches (ultra-low FAR models also read 1 mG at 5 inches and 2.5 mG at 1 inch). Golden Designs publishes model-level readings measured close to the panel (full-spectrum and hybrid cabins around 1 mG, FAR around 2 mG at 2–3 inches). Dynamic publishes a general low-EMF figure. These are the manufacturer’s readings at stated distances, not a named-lab seated report, and we don’t claim independent third-party verification — ask us for the current per-distance measurement sheet before you buy. If documented per-distance EMF is your deciding factor, the Maxxus line is the one built around that data.

The solid, kiln-dried wood used for the interiors across Golden Designs, Maxxus, and Dynamic — no plywood, MDF, or particleboard in the panels, and no varnish or stain on the inner surfaces. Hemlock is one of the lower-VOC woods used in sauna building, which matters because heat accelerates off-gassing. A cabin advertised as “solid Hemlock” rather than “Hemlock veneer” is the real thing.

The aromatic premium wood on Maxxus’s higher-end and full-spectrum cabins (a couple of S-Line full-spectrum models use Pacific Cedar). While the core Maxxus and Dynamic lineups are solid Canadian Hemlock, Maxxus steps up to solid Red Cedar on its premium models — naturally scented, dimensionally stable, and the look and smell many buyers associate with a traditional sauna. Like Hemlock, it’s solid and kiln-dried, with no plywood, MDF, or interior coatings.

Volatile organic compounds released by wood and adhesives — and heat speeds that release up, so wood choice matters more in a sauna than in furniture. The cabins we carry use solid Hemlock and formaldehyde-free or low-VOC joinery adhesives, with no interior finish to off-gas. Standard first-use protocol on any sauna: run it empty at temperature for 30–60 minutes with the door cracked before your first session.

Color-therapy lighting — a set of colored LEDs (typically eight colors) you cycle through for ambiance and relaxation during a session. It's included as standard on the cabins we carry, not an upsell. Think mood lighting with a wellness framing rather than a clinical treatment.

Dedicated red-wavelength LED panels (around 620–660 nm) integrated into most current cabins, distinct from the infrared heaters and from chromotherapy. Red light is the wavelength associated with skin and surface-recovery claims. Because it's built in on most models, buyers don't need a separate red-light device — check each model's spec for whether the panels are included.

Third-party safety listings (Intertek's ETL mark, CETL for Canada) verifying the heater and electrical system meet U.S./Canadian safety standards. Important to understand the scope: ETL/CETL covers electrical safety, not emissions or EMF — it's a real trust signal for the wiring and heaters, but it is not a CARB, Greenguard, or EMF certificate.

A cabin that runs on the standard 120-volt, 15-amp household outlet (the NEMA 5-15 receptacle already on your walls) — no electrician, no permit, no new circuit. This is the entire Dynamic entry-tier advantage and the reason a renter, condo owner, or 120V-only fire station can install one. If a cabin is “plug-and-play,” the install is a purchase decision, not a construction job.

The ladder that determines your install: 1–2 person infrared runs on a standard 120V 15-amp outlet; 3–4 person steps up to a 120V 20-amp circuit (still 120 volts, but an electrician is advised to confirm the outlet); 6+ person, hybrid, and traditional cabins need a dedicated 240V 30- or 40-amp hardwired circuit run by a licensed electrician. The NEC requires sauna circuits to be sized at 125% of the heater's rated current because the load is continuous.

What it costs to run. Infrared cabins draw 1.5–2.4 kW, which pencils out to roughly $0.25–$0.75 per session and $5–$15 a month with regular use. Traditional steam saunas use 4.5–9 kW heaters and run hotter, so they cost meaningfully more — typically $20–$45 a month. Hybrids land in between depending on which heat mode you use.

The cabins ship pre-fabricated and palletized; the wall, floor, and ceiling panels clip together with included cam locks in about 1–2 hours with no special tools. That's a real distinction from a built-in room-conversion sauna, which is a contractor job. If you'd rather not do it yourself, professional assembly can be quoted as a separate line item.

The manufacturer's “Limited Lifetime Warranty” branding refers to the lifetime of the product family, not lifetime coverage on any single part. The actionable terms across Golden Designs, Maxxus, and Dynamic are the same: 5 years on heating elements and electronics, 1 year on the wood structure (and radio). Coverage is for the original purchaser and must be registered within 60 days — read the term numbers, not the headline.

Standard cabins are warranted for indoor use only — putting a non-outdoor-rated cabin on a deck or patio voids coverage, because sun, rain, and freeze-thaw destroy an indoor cabin. Only specific outdoor-rated models (Golden Designs offers several) are built for exterior placement, and even those want weather protection. Always confirm the exact model is outdoor-rated before an outdoor install.

A seller the manufacturer recognizes to register warranties, file claims, and handle freight on the buyer's behalf. On a $2,000–$13,000 cabin that ships as freight, this is doing real work: an authorized dealer registers the unit to your name at purchase, files the LTL damage claim and fronts replacement parts, and stays in the manufacturer's claims loop — where a marketplace listing routes you back to the carrier alone. Blue Sky is authorized for all three brands.

The carcinogenic combustion byproducts firefighters absorb on the fireground — the reason fire departments run sauna wellness programs. Peer-reviewed work (PMC, 2024–2025) found a combined shower-then-sauna protocol reduced urinary PAH metabolites by 24–37% depending on the compound. The honest framing matters: it was a combined intervention, not sauna alone, and the IAFF has not issued an official recommendation — departments adopt it as a precautionary measure.