Hemlock Wood for Sauna: How It Compares to Cedar
Discover how hemlock stacks up against cedar in durability, heat retention, cost, and comfort for your perfect sauna build.
Hemlock wood for sauna use is the better choice when scent sensitivity, consistent heat distribution, and indoor durability are the priorities, while cedar edges ahead for outdoor builds and users who actively enjoy its aromatic oils. For most climate-controlled indoor installations, hemlock performs reliably and costs less.
- Resin Content Decides Comfort: Hemlock's very low resin content means it stays odor-neutral at high temperatures, making it the practical choice for anyone with scent sensitivities or respiratory concerns.
- Cedar's natural oils give it a genuine advantage in outdoor or high-steam conditions, but that benefit shrinks considerably in a climate-controlled indoor sauna.
- Thermo-Aspen and Thermo-Spruce are treated in a low-oxygen, high-heat process that lowers moisture absorption and improves stability beyond what either untreated softwood offers.
- Never seal, oil, or stain the inside of a sauna cabin; the wood needs to breathe and dry between sessions, and any coating that blocks that will accelerate deterioration.
- Indoor vs. Outdoor Is the Real Split: For most indoor home saunas with multiple users, hemlock performs as well as cedar at a lower price point; cedar earns its reputation mainly in outdoor builds where moisture exposure is constant.
Where to start
Medical Breakthrough Traditional 7 v2a: Traditional 3 Person Sauna Hemlock Wood, Bluetooth Audio, Rapid Heating
Maxxus FAR Infrared Sauna Near Zero EMF with Canadian Red Cedar Wood (MX-K206-01-ZF CED)
Why the Wood Actually Matters in a Sauna
A sauna's wood is not decorative. It determines how the cabin heats, how the air feels, how long the structure lasts, and what you're touching when surfaces reach 160°F or higher. Choosing between hemlock and cedar is one of the first real decisions a buyer makes, and it affects everything from daily comfort to how the unit holds up over a decade of use.
Both woods have genuine strengths, and neither is universally better. The right answer depends on your priorities: budget, sensitivity to scent, climate, intended use, and how much maintenance you're willing to do. This comparison works through each of those factors using the real properties of each wood, grounded in how they actually perform in a heat environment.
Hemlock Wood for Sauna: Core Properties
Canadian Hemlock is a light-colored, fine-grained softwood with a notably even texture. It has very low resin content, which is the defining characteristic that makes it well-suited for saunas. When wood with higher resin content heats up, the resins can bleed to the surface, creating sticky patches and a strong chemical smell. Hemlock stays clean and odor-neutral even at high temperatures, which is why people with scent sensitivities often find it far more comfortable than aromatic alternatives.
The wood's density sits in a moderate range, which gives it reasonable heat retention without the extreme thermal mass of some hardwoods. It warms relatively quickly and distributes heat evenly across its surface, meaning the bench and walls reach a consistent temperature without developing hot spots. For home sauna use, this predictability is practical.
Hemlock is also dimensionally stable under heat cycling. Saunas expand and contract every session, and a wood that warps or checks under those conditions becomes a long-term problem. Hemlock handles repeated thermal stress well, which is why it appears across so many indoor sauna builds, from entry-level kits to models priced above $10,000. The Medical Breakthrough Traditional 7 v2a and Medical Breakthrough Traditional 6 v2 both use 100% natural Canadian Hemlock throughout their construction, and Medical Breakthrough specifically cites durability as a reason for the choice.
Cedar Wood for Sauna: Core Properties
Western Red Cedar and Canadian Red Cedar are the varieties most commonly used in saunas. Cedar is a softer, lighter wood with a distinctive reddish-brown color and a strong natural fragrance that comes from its aromatic oils. Those oils are also responsible for cedar's natural resistance to moisture, insects, and decay, which is one reason the wood has historically dominated outdoor sauna builds.
Cedar's thermal properties are slightly different from hemlock's. It is lower in density, which means it heats up faster but also loses heat more quickly. In practice, the difference is marginal for most sessions, though it can matter in climates where the sauna needs to hold temperature against cold ambient air. The wood's natural oils also act as a mild preservative, which extends its life in conditions where moisture is more of a factor.
The scent is the main dividing line between cedar and hemlock users. Many people find it pleasant and associate it with the sauna experience. Others, particularly those with respiratory sensitivities or allergies, find prolonged exposure uncomfortable. The Maxxus FAR Infrared Sauna in Canadian Red Cedar is a good example of how cedar is typically positioned: it pairs the aromatic wood with PureTech Near Zero EMF panels, bronze tinted tempered glass, and chromotherapy lighting, creating an environment where the cedar scent is part of the sensory package.
Head-to-Head: Where Each Wood Wins
Scent tolerance is the clearest differentiator. If anyone using the sauna has asthma, fragrance sensitivities, or finds strong wood smells distracting, hemlock is the straightforward answer. It produces no meaningful odor even at sustained high temperatures. Cedar's scent intensifies with heat, which is part of its appeal for some users and a dealbreaker for others.
Appearance Over Time
Hemlock starts pale and typically stays light, though it darkens slightly with age and regular use. Cedar begins with that warm reddish tone and silver-grays over time if exposed to the elements. Indoors, cedar maintains its color better, but hemlock's neutral appearance is easier to match with different interior aesthetics. Neither wood requires staining or sealing inside a sauna, and neither should be treated with any finish that would off-gas at heat.
Moisture and Durability
Cedar has a natural edge in moisture resistance because of its oils. For outdoor saunas or builds in high-humidity environments, that matters. For climate-controlled indoor installations, the difference is less significant. Hemlock performs reliably indoors with normal sauna ventilation and maintenance. The Medical Breakthrough 7 Ultra Full Spectrum Sauna uses Canadian Hemlock for an indoor three-person build priced at $12,649, and the construction has been tested across extended use cycles without material degradation.
For indoor traditional saunas, hemlock's moisture performance is generally sufficient. Where cedar tends to pull ahead is in applications where the wood faces prolonged outdoor exposure or less controlled humidity levels.
Price and Availability
Hemlock is generally less expensive than cedar, and that cost difference flows through to finished sauna prices. Models built from hemlock often sit at a more accessible price point, though premium hemlock builds like the Medical Breakthrough Traditional 7 v2a at $10,799 demonstrate that the wood is used across a wide range of quality tiers. Cedar commands a modest premium, reflecting its natural oil content and reputation for outdoor durability.
Thermally Modified Wood: A Third Option Worth Knowing
Several manufacturers have moved toward thermally modified woods, particularly Thermo-Aspen and Thermo-Spruce. These are not a different species but a different treatment process: the wood is heated in a low-oxygen environment at very high temperatures, which breaks down the sugars that feed rot and insects, lowers moisture absorption, and improves dimensional stability. The result is a wood that behaves more consistently than untreated softwoods in demanding heat and humidity cycles.
Auroom uses Thermo-Aspen extensively across its indoor kit line, noting a chemical-free thermal modification process and enhanced resistance to sauna conditions. Leil Saunas builds its Como and Viva series from 40mm ThermoWood walls, citing the construction's contribution to heat retention and long-term durability. These modified woods produce minimal scent, share hemlock's neutral odor profile, and often show better long-term stability than either raw hemlock or cedar in outdoor contexts.
Understanding how sauna kits are constructed helps here: the wall thickness and wood treatment interact with each other, and a 40mm thermowood wall performs differently from a thinner untreated panel even if the species name sounds similar. If you're comparing kit saunas across brands, check both the wood type and the wall thickness, not just the species name.
How Sauna Type Should Influence Your Wood Choice
Traditional saunas and infrared saunas expose wood to different conditions. Traditional units run hotter, often above 170°F, with cycles of steam when water is poured on the rocks. Infrared saunas run at lower temperatures but deliver concentrated radiant heat directly to the body. Both put thermal stress on the wood, but traditional saunas also add moisture stress from steam, which makes wood selection slightly more consequential.
For traditional sauna builds, cedar's natural oil content provides some benefit in high-moisture conditions. Hemlock holds up well, but consistent ventilation and proper cool-down procedures become more important over time. The Medical Breakthrough Traditional 7 v2a addresses this through its Safe Cool Down System, which gradually reduces the cabin temperature after each session, limiting the rate of thermal cycling the wood experiences.
Infrared sauna wood runs at lower sustained temperatures, which reduces the stress on resins and grain structure. Both hemlock and cedar are commonly used in infrared builds. The Maxxus FAR Infrared Sauna uses Canadian Red Cedar alongside six PureTech Near Zero EMF carbon heating panels, while many of the Medical Breakthrough infrared and full-spectrum models use hemlock. The wood does not significantly affect infrared output, so the choice comes down to the sensory and aesthetic factors rather than performance.
If you're exploring traditional saunas for home use, the temperature range is worth factoring into your wood decision. Higher heat and steam use favor woods with natural moisture resistance, which gives cedar a slight edge in that specific scenario.
Medical Breakthrough Hemlock Models: How They Line Up
Medical Breakthrough builds its entire traditional and full-spectrum range from Canadian Hemlock, which makes its lineup a useful reference point for comparing what hemlock construction delivers at different price and capacity levels. The table below covers the main models available, with specs drawn directly from their listings.
| Model | Capacity | Sauna Type | Price |
|---|---|---|---|
 Medical Breakthrough Traditional 5 V2A |
2 person | Traditional | $7,799 |
 Medical Breakthrough Traditional 6 v2 |
2-3 person | Traditional | $8,799 |
| Medical Breakthrough Traditional 7 v2a |
3 person | Traditional | $10,799 |
 Medical Breakthrough 7 Ultra 3 Person Full Spectrum Sauna |
3 person | Full Spectrum Infrared | $12,649 |
 Medical Breakthrough 9 Traditional Sauna |
3-6 person | Traditional | $15,649 |
 Auroom Aura 2-Person Outdoor Traditional Sauna Kit |
2 person | Traditional (outdoor) | $17,990 |
One pattern that stands out in that range: Medical Breakthrough uses Canadian Hemlock consistently from the entry-level two-person model up to the six-person Traditional 9, which confirms that the wood's performance scales reliably with cabin size and heat demand. The Medical Breakthrough 7 Ultra adds ten full-spectrum heaters producing near, mid, and far infrared wavelengths alongside the hemlock shell, and the wood handles that sustained heat output without the resin-bleed issues that would arise with a more resinous alternative. The Auroom Aura sits at the premium end as an outdoor kit, where its construction choices serve different conditions entirely.
Maintenance: What Each Wood Actually Needs
Both hemlock and cedar are relatively low-maintenance when used correctly in a sauna environment. Neither should be sanded aggressively, sealed, or treated with oils or stains inside the cabin. The interior surfaces need to breathe and absorb sweat, then dry out between sessions. Blocking that process with coatings shortens the wood's life and can introduce off-gassing at heat.
Regular wiping down of benches with a damp cloth after sessions, combined with leaving the door slightly open to allow ventilation during cool-down, is the core of sauna wood maintenance. The Medical Breakthrough Traditional 6 v2's Insulated Airflow System and Safe Cool Down System are designed partly to manage this process automatically, keeping post-session humidity from sitting in the wood longer than necessary.
Cedar may develop small checks or cracks over time if the moisture cycling is extreme. Hemlock can show similar behavior but tends to be slightly more dimensionally stable. Neither issue is structural; it's cosmetic and common in heat-cycled wood. For outdoor cedar saunas, the exterior can be treated with a UV-resistant wood finish to slow weathering, but the interior should always remain untreated.
Who Hemlock Suits Best, and When Cedar Makes More Sense
Hemlock is the better choice for most indoor home saunas, particularly where the user wants a scent-neutral environment, has respiratory sensitivities, or is purchasing a unit that will be used daily by multiple people with different tolerances. It's also the practical choice for buyers who want a premium build without paying the cedar premium, since the performance difference in a climate-controlled indoor setting is minimal.
Cedar makes more sense for outdoor installations where natural moisture resistance is a genuine advantage, and for users who actively enjoy the aromatic experience. If the sauna will be used primarily by one or two people who appreciate the scent and have no sensitivities, cedar delivers a sensory environment that hemlock cannot replicate. It's a matter of preference, not performance superiority.
Browsing the full range of traditional saunas side by side makes the wood distinction clearer in context: you'll see hemlock and cedar builds at similar price points, and the differences in construction detail become easier to evaluate when the models are next to each other. For buyers also considering the contrast between heat formats, the range of infrared saunas shows how wood choice plays out in lower-temperature, higher-frequency heat environments, where cedar's moisture advantages matter even less and the decision comes down almost entirely to personal preference.
The outdoor context is worth a separate look for anyone considering an exterior installation. Many outdoor sauna buyers default to cedar for good reasons, but thermally modified alternatives like Thermo-Aspen and Thermo-Spruce have changed that calculation. Comparing outdoor sauna kit options across styles and wood types gives a clearer picture of which construction approach fits the specific demands of your site.
Making the Final Call
The hemlock versus cedar question resolves quickly once you anchor it to your actual situation. Indoor sauna with regular multi-user access and no strong preference for the aromatic experience: hemlock is a clean, reliable, well-proven choice. Outdoor installation with significant moisture and weather exposure, or a user who genuinely wants that cedar scent as part of the ritual: cedar earns its reputation.
What neither choice should hinge on is vague claims about one being categorically superior. Both woods have been used successfully in saunas for decades. The differences are real but specific, and understanding which ones apply to your setup is more useful than a simple ranking. The construction around the wood, wall thickness, heater placement, ventilation design, and the heat format itself, shapes the daily experience at least as much as the species of tree it came from.
If you're uncertain, hemlock is the lower-risk starting point for most buyers. It's what Medical Breakthrough uses across a price range from $7,799 to above $15,000, which reflects confidence in its performance across different heat demands and session intensities. Cedar is a deliberate upgrade for specific circumstances, not a universal improvement.
More saunas worth a look
Medical Breakthrough 7 Ultra 3 Person Full Spectrum Sauna with 10 Heaters, Hemlock Wood, Sound System
Medical Breakthrough Traditional 6 v2: Traditional 3 Person Sauna - Detox Routine, Rapid Heating, Bluetooth, Hemlock Wood
Frequently asked questions
Is hemlock wood a good choice for a home sauna?▾
For most indoor sauna buyers, hemlock is a practical and reliable choice. Its very low resin content means it stays odor-neutral at high temperatures, which matters more than people expect once sessions are underway. It also handles repeated heat cycling well, staying dimensionally stable without warping or checking over years of regular use.
Is hemlock wood safe to use in a sauna, especially at high temperatures?▾
Hemlock is safe for sauna use precisely because it has low resin content. Woods with higher resin levels can release sticky residue and chemical odors when heated, but hemlock stays clean. The Medical Breakthrough Traditional 7 v2a, built from 100% natural Canadian Hemlock, reaches temperatures up to 194 degrees F without off-gassing or surface bleed from resins.
How much does a hemlock sauna typically cost?▾
Hemlock saunas span a wide range depending on size, heating type, and features. The Medical Breakthrough Traditional 6 v2, a three-person traditional sauna built from Canadian Hemlock, is priced at $8,799. The Medical Breakthrough Traditional 7 v2a, also Canadian Hemlock, comes in at $10,799, and the Medical Breakthrough 7 Ultra Full Spectrum Sauna with ten heaters sits at $12,649.
How do I set up a hemlock sauna at home?▾
Most indoor hemlock saunas arrive as modular panel systems that assemble without specialized tools, though you should confirm the electrical requirements before delivery day. The Medical Breakthrough Traditional 6 v2 and Traditional 7 v2a both include interior LED control panels for straightforward operation once assembled. Clear floor space, a level surface, and access to an appropriate electrical circuit are the three things to sort out before the unit arrives.
What are the ongoing running costs of a hemlock sauna?▾
Running costs depend mainly on the heater type, session length, and how often you use it. Traditional sauna heaters like those in the Medical Breakthrough Traditional 7 v2a reach up to 194 degrees F, which draws more power than infrared models but typically heats the cabin faster. Reviewing the unit's wattage against your local electricity rate gives a realistic per-session cost estimate before you buy.
How do I maintain a hemlock wood sauna?▾
Hemlock requires no sealing, staining, or chemical treatment inside a sauna, and applying finishes would be counterproductive since they off-gas at heat. Regular maintenance mostly means wiping down benches and walls after sessions, ensuring the ventilation system is clear, and inspecting joints periodically for any movement caused by heat cycling. Hemlock's dimensional stability under thermal stress keeps maintenance fairly minimal compared to less stable woods.
How do I choose the right size hemlock sauna for my space and household?▾
A two-person sauna is workable for solo users who want extra room, but if two or more people regularly use the sauna together, a three-person model gives a noticeably more comfortable experience. The Medical Breakthrough Traditional 6 v2 accommodates up to two people with a 60-inch wide bench, while the Traditional 7 v2a and the 7 Ultra Full Spectrum both seat up to three. Measure your available floor space carefully before deciding, since sauna cabins are difficult to relocate once assembled.
What is the most common mistake buyers make when choosing between hemlock and cedar saunas?▾
The most common mistake is assuming cedar is always the premium option. Cedar does have natural moisture resistance and a pleasant scent, but for indoor use those advantages narrow considerably. Anyone in the household with scent sensitivities or respiratory issues may find cedar's aromatic oils uncomfortable at sustained temperatures, while hemlock stays odor-neutral. Choosing based on scent preference and actual use environment rather than wood reputation tends to produce better long-term satisfaction.
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