New Sauna Smell: Off-Gassing, VOCs, and What Is Safe

A brand new sauna often has a smell, and most of the time it is the natural aroma of real wood, which fades on its own. The smell to watch for is a sharp chemical or new furniture odor at operating temperature, which can signal glues or finishes off-gassing under heat. This guide explains the difference between a harmless cedar scent and a real off-gassing problem, what materials cause it, and how to air out a new sauna safely.

Is a new sauna smell dangerous?

Usually not. Solid cedar, hemlock, basswood, and spruce give off a pleasant woody aroma that is simply the wood's natural oils warming up, and that scent mellows over the first few weeks of use. What you do not want is a strong chemical, plastic, or glue smell, because heat can accelerate the release of volatile organic compounds (VOCs) from synthetic adhesives, stains, or sealants. Under sauna heat, VOC release from those materials can rise well above room temperature levels, and in traditional and steam saunas high humidity can worsen it. The good news is that a sauna built from solid wood with formaldehyde free, water based glue has very little to off-gas. The practical test is simple: run the empty sauna hot and use your nose. A clean wood smell is fine. A chemical or new furniture odor points to adhesives or finishes and deserves attention.

Natural wood aroma vs chemical off-gassing

What causes sauna off-gassing

The materials matter more than the wood species. The main culprits are engineered wood and synthetic finishes. Plywood and particleboard are bonded with adhesives that can contain urea or phenol formaldehyde, and heat can drive that formaldehyde out of the panel. The U.S. Environmental Protection Agency notes that formaldehyde from pressed wood products is a known indoor air pollutant that can irritate the eyes, nose, and throat, which is why solid wood construction matters in a hot cabin. Stains, varnishes, and some sealants add their own VOCs. A quality sauna avoids this by using solid, untreated wood inside the hot room and formaldehyde free, water based glue where any bonding is needed. Cedar is popular partly because its natural oils resist moisture and decay, so it never needs chemical treatment.

How to air out a new sauna safely

1. Run it hot and empty first. Heat the sauna to its normal operating temperature for 30 to 60 minutes with no one inside. Heat speeds up the release of any residual odor so it can clear before you use it.
2. Ventilate during and after. Open the door and any vents, and air out the room. Good airflow carries odors away instead of letting them concentrate. Our sauna ventilation guide covers how to vent a home sauna properly.
3. Repeat for the first several sessions. Natural wood aroma fades over a few weeks of normal use. Each heat cycle helps.
4. Do a smell test at temperature. If a chemical odor persists after several hot, well ventilated cycles, that is the sign to look closer at the materials rather than keep using it.

How to buy a low off-gassing sauna

The cleanest air comes from choosing well at purchase. Look for solid wood interiors rather than veneer or plywood, formaldehyde free or water based adhesives, no synthetic stains or sealants inside the hot room, and for infrared cabins, published third party testing for EMF and VOC where available. This transparency is part of why buying from an authorized retailer matters, and it ties into the same materials questions covered in our home sauna buying guide. Browse cabins built from solid wood in our infrared saunas collection, and if you want the traditional experience, the traditional saunas range uses the same solid wood standard.

Frequently asked questions

How long does a new sauna smell last?

A natural wood aroma from solid cedar or hemlock usually fades within a few weeks of regular use as the wood's oils settle. A chemical odor that lingers after several hot, ventilated sessions is different and points to adhesives or finishes.

Are infrared saunas safe to breathe in?

A sauna built from solid, untreated wood with formaldehyde free glue has very little to off-gas and is fine to breathe. Concerns arise mainly with plywood, particleboard, or synthetic finishes, which is why solid wood construction and, for infrared, third party VOC testing are worth confirming.

Should I air out a new sauna before using it?

Yes. Run it hot and empty for 30 to 60 minutes with the door and vents open before your first real session, and repeat for the first several uses. This clears residual odor and lets any natural aroma settle.

Have a question about the materials in a specific cabin? Our team is glad to walk you through construction and testing details. Reach us on the contact page or start with the infrared saunas for sale collection.

External references: U.S. EPA, Formaldehyde and indoor air quality; U.S. EPA, Formaldehyde standards for composite wood products.