The contrast-therapy testing lab
Every cold plunge and sauna, ranked on what actually matters.
Most "best of" lists are ordered by commission and thin on the numbers that decide a $5,000 buy. We do the part they skip — the real running cost, the 240V wiring, the total cost over five years, and the honest downsides — and we publish it.
Ice
Cold plunges & ice baths
From a $150 tub to test the habit to a $14,000 chiller unit. We rank by cooldown speed, chiller efficiency, sanitation, and real running cost.
Fire
Saunas — infrared & traditional
Barrel, cabin, indoor, infrared. We measure heat-up time, real electricity draw, and whether you actually need a 240V circuit.
The number no one publishes
What it actually costs to run
A $6,000 chiller that costs $40 a month is a different decision than a $2,000 tub that costs $120. An infrared sauna runs 60–75% cheaper per session than a traditional one. We built the calculator that shows you the real five-year cost — by your usage and your local electricity rate.
Open the cost-to-run calculator →Why hot and cold, on one site
Sauna and cold plunge aren't two hobbies — they're one protocol. Heat, then cold, in sequence, is where most of the benefit and most of the ritual lives. Every other review site picks a side. We cover the stack: which sauna pairs with which plunge, the order, the temperatures, and how long. Start with the protocol, then buy once.
Read the contrast therapy protocol →How we rank
Our standards →Independent. We're funded by affiliate commission, never brand payments — so a place in a ranking can't be bought, and we'll happily tell you a popular product isn't worth it.
Cost-first. We work out the real running costs — kWh, dollars a month, cost per session — and publish them where the brands won't. It's often the number that decides the buy.
Exhaustively researched. We don't say anything about a product until we've dug through its specs, heater or chiller quality, materials, warranty and real owner feedback — weighed by a public-health specialist, and dated when it changes.