ThermalFinn: Engineering-Grade Sauna Content

Most sauna sites give you lifestyle fluff. Pretty photos. Vague claims. Zero data.

ThermalFinn is different. We test thermal mass, measure R-values, and calculate electrical load. Every heater review includes heat-up curves, stone mass performance, and energy consumption data. Every build guide includes real measurements and material specs.

You won’t find “top 10 saunas for relaxation” lists here. You’ll find the engineering that separates a great sauna from an expensive hot room.

What You’ll Find Here

Heater Reviews and Rankings

Head-to-head comparisons of electric and wood-burning heaters. Scored on thermal output, stone mass, heat-up time, energy efficiency, build quality, and smart controls. Includes an interactive kW calculator for sizing your heater to your room.

Build Guides

Step-by-step construction guides for indoor, outdoor, and barrel saunas. Insulation science, ventilation rules, wood selection, and cost breakdowns with real numbers.

Thermodynamics

The physics behind sauna performance. Heat transfer modes, loyly science, air circulation patterns, and energy efficiency data. This is the content no other sauna site publishes.

Health and Science

Peer-reviewed research on sauna health benefits. We cite the actual Finnish cohort studies, not wellness blog summaries. Cardiovascular, neurological, recovery, and temperature protocols.

Sauna Types and Buying Guides

Finnish vs infrared. Barrel vs cabin. Pre-built kits ranked by construction quality. Honest comparisons with data to back every recommendation.