A home cold plunge typically costs 15 to 40 dollars a month in electricity for the chiller, plus another 10 to 20 dollars a month in filtration and water treatment supplies, for a realistic monthly total of 25 to 60 dollars with regular use. The exact number depends heavily on where the tub sits: an insulated indoor space costs less to run than a garage or uninsulated outbuilding exposed to seasonal temperature swings, since the chiller has to work harder to fight a bigger gap between ambient and target temperature.
Use Case: A Single Daily User in a Small Apartment
For one person using a compact 60 to 90 gallon tub daily in a climate-controlled apartment, monthly electricity typically lands toward the lower end, around 15 to 25 dollars, since indoor ambient temperature stays fairly stable year-round and the smaller water volume needs less total cooling energy per session even though it swings faster. Filtration costs for a single user running one tub daily tend to sit around 10 to 15 dollars a month, mostly for ozone generator upkeep and occasional test strips.
Use Case: A Couple Sharing One Tub in a Garage
Two people sharing a 100 to 130 gallon tub in a garage face a different cost picture. The larger water volume needs more total energy to chill, and an unheated garage swings from near-freezing in winter to well over 90 degrees in summer in much of the country, both of which make the chiller work harder than it would in a stable indoor space. Expect 30 to 50 dollars a month in electricity for this setup, with summer months typically running toward the higher end as the chiller fights ambient heat more aggressively.
Use Case: Seasonal Use in an Unheated Outdoor Space
Someone running a cold plunge outdoors or in an unheated three-season room only part of the year sees costs concentrated in the months it is actually used, but each session during peak summer heat can cost noticeably more per use than the same session in cooler weather, since the chiller is fighting a wider temperature gap. Covering the tub between uses, even with a basic foam lid, meaningfully cuts this cost by reducing evaporative cooling loss and blocking direct sun exposure that warms the water between sessions.
What Drives the Monthly Cost Up or Down?
Four factors matter most: target water temperature, since colder settings in the 39 to 45 degree range cost more to maintain than 50 to 55 degrees; ambient room or outdoor temperature, since a bigger gap between ambient and target means more chiller run time; insulation, both the tub’s shell and any cover used between sessions; and frequency of use, since more body heat entering the water more often means more total cooling work over a month. A well-insulated tub in a temperature-stable indoor space, used once daily by one or two people, sits at the low end of the cost range; an uninsulated tub in a garage used heavily by multiple people sits at the high end.
Filtration and Maintenance Costs Beyond Electricity
Electricity is usually the smaller of the two recurring costs once filtration is added in. Ozone or UV filtration systems need periodic upkeep, sanitizer or shock treatment runs 5 to 15 dollars a month depending on usage, and most tubs need an occasional filter cartridge swap that adds another few dollars a month averaged out. Skipping filtration to save this cost tends to backfire, since unfiltered water used daily by more than one person often needs a full drain and refill every week or two, which wastes both water and the energy already spent chilling it. Refilling a 100 gallon tub from a standard residential tap also takes time and, in areas billed by water usage, adds a cost of its own that rarely gets counted against the “savings” of skipping a filtration system in the first place.
Comparing Total Running Costs Before You Buy
Because chiller efficiency and insulation quality vary meaningfully between models, it is worth checking a unit’s rated power draw and insulation details before assuming every tub costs roughly the same to run. SweatDecks’ lineup lists chiller wattage and tub specs together on the product page, which makes it easier to estimate a realistic monthly cost for a specific household’s use pattern before ordering rather than guessing after the fact.
Frequently Asked Questions
How much does a cold plunge cost to run per month?
A typical home cold plunge chiller costs 15 to 40 dollars a month in electricity for regular use, with the range depending on target water temperature, ambient room temperature, and how well the tub is insulated.
Does a cold plunge cost more to run in a garage than indoors?
Yes, usually. A garage or uninsulated outbuilding exposes the chiller to bigger swings in ambient temperature, especially in summer, which makes it work harder and can raise the monthly electric cost by 30 to 50 percent over an indoor setup.
Is it cheaper to use ice instead of a chiller?
For occasional use, ice can be cheaper upfront, but for daily or near-daily use a chiller is almost always cheaper over a few months once the recurring cost of buying and hauling bags of ice is factored in.
Does insulating a cold plunge tub save money?
Yes, an insulated tub shell or a simple foam cover between uses reduces how hard the chiller has to work to hold temperature, and can meaningfully cut the monthly electricity cost, especially in a garage or outdoor setup.
What other monthly costs come with owning a cold plunge?
Beyond electricity, budget 10 to 20 dollars a month for filtration and water treatment supplies such as ozone generator upkeep, sanitizer, and occasional pH test strips, plus periodic filter replacement costs.
The monthly cost is easier to justify against research that, while mixed, does show real associations worth weighing. A 2025 systematic review and meta-analysis in PLoS One found cold-water immersion associated with a range of wellbeing outcomes across pooled trials. A Frontiers in Physiology meta-analysis on post-exercise cold water immersion found associations with faster perceived fatigue recovery, and a Cochrane review found modest evidence that cold-water immersion reduces post-exercise muscle soreness compared to no treatment. None of these studies claim cold plunging prevents injury or guarantees performance gains, and some research suggests it may blunt certain strength adaptations if used right after resistance training, so the honest framing is a helpful recovery tool with real running costs, not a cure-all.
References
- “Effects of cold-water immersion on health and wellbeing: A systematic review and meta-analysis.” PLoS One, 2025. https://pubmed.ncbi.nlm.nih.gov/39879231/
- “Effects of cold water immersion after exercise on fatigue recovery and exercise performance: meta analysis.” Frontiers in Physiology, 2023. https://pubmed.ncbi.nlm.nih.gov/36744038/
- “Cold-water immersion (cryotherapy) for preventing and treating muscle soreness after exercise.” Cochrane Database of Systematic Reviews, 2012. https://pubmed.ncbi.nlm.nih.gov/22336838/
By Amanda Reyes
