How to Shield an Infrared Sauna from EMF Exposure
- Shane
- Jun 5
- 4 min read
Many people in the Portland area invest in infrared saunas to support recovery, circulation, and overall wellness. However, most electric infrared saunas generate significant AC electric fields that can interfere with the very benefits users are seeking.
As a Building Biologist focused on home EMF testing and mitigation, I regularly evaluate these environments. In one recent project, an infrared-style electric sauna measured between 30–160 V/m in the user area. After targeted shielding, levels dropped below 0.5 V/m, nearly reaching the strict no-concern threshold used in Building Biology guidelines.
This article explains why AC electric fields matter in saunas, how they interact with the body during use, and what can be done to create a truly low-EMF recovery space.
What Are AC Electric Fields?
An AC electric field is created by voltage differences between different points in a space or room. The differences come from the variety of electrical wiring, lights, and devices in a given space. Unlike magnetic fields (which require current to flow), electric fields exist whenever voltage is present even when the sauna (or lamp, or hair dryer, or computer) is plugged in to the wall but turned off.
These fields represent a voltage gradient across space. When a person sits inside this gradient, the body can pick up an induced voltage. In most modern homes, we are surrounded by wiring in walls, floors, and ceilings. In a sauna, however, the combination of close proximity to heaters and the body’s physical state makes this effect much more pronounced.
Why Infrared Saunas Are Especially Problematic
Infrared saunas create ideal conditions for the body to interact with electric fields:
Sessions typically last 15–45 minutes
Users are usually unclothed, or have minimal clothing on
Heavy sweating dramatically lowers skin resistance
Bodies are positioned close to energized heating panels or elements
When skin resistance drops due to sweat, the body becomes a better conductor. This allows the external voltage gradient to more easily induce small electric currents through tissues. What begins as a voltage field in the air becomes a measurable influence on the body itself.
From a Building Biology perspective, we measure both the electric field strength in the air and body voltage because the latter more accurately reflects what a person actually experiences.
In my experience, sauna manufacturers make strong claims about how low-EMF their products are, but these turn out to be marketing mumbo-jumbo: the tests are poorly done, use low-quality meters, or don’t look at the appropriate range of frequencies that can impact biology.
Plus, my real-world tests of many sauna brands reveal high EMF exposures.
How High EMF Can Reduce the Therapeutic Benefits of Infrared Sauna Use
Infrared saunas are valued for their ability to raise core temperature, activate heat shock proteins, improve circulation, and support the body’s natural recovery processes. These benefits depend on the body being able to respond cleanly to the thermal stress.
When a strong AC electric field is also present, the body must compensate against an additional low-level electrical stressor during the session. This can:
Increase overall physiological load during what should be a restorative period
Interfere with full parasympathetic (rest-and-digest) activation
Potentially compete with natural bioelectric signaling in cells and tissues
Reduce the net benefit of the heat therapy
In short, an electric sauna environment itself can work against the recovery goals that motivated its use in the first place. Many health-conscious individuals in the Portland metro area are surprised to learn that their infrared sauna may be adding to, rather than reducing, their total EMF exposure during dedicated recovery time.
Real-World Results: Shielding an Infrared Sauna
In the project referenced above, initial measurements in the seating area showed AC electric fields ranging from 30 to 160 V/m. These levels fall well into the range that Building Biology considers a concern for recovery spaces.
After applying targeted shielding strategies appropriate for the sauna’s construction and electrical layout, readings dropped to less than 0.5 V/m. This brought the environment to (or very near) the no-concern category according to Building Biology SBM-2024 guidelines.
The transformation demonstrates that meaningful reduction is possible without compromising the sauna’s function or heat performance. The goal was not to eliminate every field, but to remove the unnecessary electrical burden from the space where the user spends extended time.
Creating Low-EMF Recovery Spaces in Portland-Area Homes
Many homeowners across Portland, Lake Oswego, Beaverton, Tigard, West Linn, and surrounding areas are investing in saunas, cold plunges, and other recovery tools as part of a broader focus on health and longevity. However, the built environment- including electrical systems and appliance placement, can undermine these efforts if left unaddressed.
As someone who provides professional home EMF testing in Portland, OR, I often see similar patterns in bedrooms, home offices, and wellness spaces. Electric fields from wiring and appliances are one of the more overlooked aspects of creating truly supportive indoor environments.
Shielding an infrared sauna is one practical example of applying Building Biology principles: identify where the environment is adding unnecessary challenge, then reduce it so that intentional health practices can work more effectively.
Practical Takeaways
If you use or are considering an infrared sauna, here are key points to consider:
Measure electric field strength and body voltage in the actual user position.
Recognize that sweating significantly increases the body’s interaction with electric fields
Understand that reducing these fields can help preserve the full intended benefit of sauna use
Work with experienced professionals who understand both the technical aspects of shielding and the biological context
Proper assessment and mitigation should always be done with the right equipment and methodology. Generic “low EMF” claims from manufacturers do not always address electric fields specifically, and results can vary significantly depending on installation and wiring.
Moving Forward
Creating low-EMF environments is not about fear rather about precision. When we reduce unnecessary exposures in spaces designed for recovery, we give the body a better opportunity to do what it does best.
If you’re in the Portland metropolitan area and would like a professional home EMF assessment that includes electric fields, magnetic fields, dirty electricity, artificial light and radio frequency measurements, I offer thorough evaluations tailored to individual homes and wellness spaces.
Whether you’re dealing with an existing infrared sauna, planning a new installation, or addressing EMF concerns throughout your home, targeted testing provides the clarity needed to make informed decisions.
Ready to evaluate your home or sauna?
Contact me to schedule a professional EMF assessment in the Portland metro area.
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