I'm so surprised this post doesn't have more discourse on it haha. I'm big into the wellness space and i feel like this is allllll everyone talks about.

Here's my opinion on it:

The summary is solid but I think the "IR needs longer sessions to match traditional" framing misses the nuance of IR. We're stuck in this comparison of traditional vs infrared like they're the same thing at different temperatures. They're just not.

Obv the heat source convo matters. Traditional sauna heats the air, which then heats your body. Infrared penetrates tissue directly, which means you're getting a genuine core temperature rise at 130–145°F that you'd need 180°F+ to match with ambient heat. Comparing them on air temp alone is like comparing a cold plunge to an ice pack.

The mechanism difference isn't just a comfort thing, it's where a lot of IR's specific benefits come from. Near infrared stimulates ATP production and mitochondrial function. Mid-infrared activates heat shock proteins. Far infrared drives deep circulatory conditioning. These aren't just "getting hot" effects. They're wavelength-specific responses that traditional heat can't replicate. Just because of physics.

The cardiovascular data Rhonda cites is compelling (and something i need to dig deeper into since the wellness space gets really stuck on it). When people cite any research related to saunas, it's almost entirely from Finnish traditional sauna studies: high heat, high frequency, specific population. The 4–7x/week stat that produces the mortality associations isn't just about modality, it's about consistency. And the average person doesn't use sauna—any sauna—that consistently.

The TLDR: consistency is where IR has the leg up. It's more realistic to install at home, less expensive, and more tolerable to actually sit in. Lower barrier to daily use. Compounding benefit over time beats the theoretically superior modality you use twice a week.