A DIY cold plunge can cost less upfront than a bought one, but it usually costs more in time, ice, and risk. A stock tank or barrel filled with bagged ice is the cheapest way to try cold water, while a chest freezer conversion adds electrical and safety problems that a purpose-built tub does not have. If you plunge a few times a month, DIY with ice can make sense. If you plunge most days, a tub paired with a real chiller is usually the more practical buy.
Prices below are our listings at the time of writing and can change, so call to confirm before you order.
What a DIY cold plunge actually means
People use “DIY” for four very different setups:
- Bathtub with ice. No build at all. You fill your tub with cold water and dump in ice.
- Stock tank, barrel, or large bin with ice. A standalone container you fill and chill with bagged ice each session.
- Chest freezer conversion. A freezer that is sealed, lined, and filled with water, using the compressor to cool it.
- Tub plus a separate chiller. Any suitable tub hooked to a standalone chiller. This sits between DIY and buying.
Plunge, a cold plunge maker, points out in its DIY cold plunge guide that a regular bathtub is shallow, poorly insulated, and has to be drained and refilled with ice every time you want to plunge.
Chest freezer cold plunge: the risks to weigh
A chest freezer cold plunge appeals because the box already cools, but a freezer is built to hold food, not a person in water next to a compressor.
Plunge’s guide lists the build steps: insulating the walls and lid, sealing every seam, adding a liner, drilling a drain, and installing a pump, filter, temperature sensor, GFCI outlet, and timer. It does not recommend the method unless someone else is with you, because forgetting to unplug the freezer before getting in, or the lid closing while you are inside, are both dangerous.
The University of Tennessee’s environmental health and safety office explains in Water and Electricity Don’t Mix that a GFCI cuts power when it detects a current imbalance of about 5 milliamperes, within as little as 1/40 of a second, and that outlets within four feet of a water source should be GFCI protected. A GFCI is a minimum, not a guarantee: have a licensed electrician check the circuit. Local code has the final word.
DIY ice bath vs cold plunge tub: cost comparison
The table below puts the DIY routes next to bought options. DIY numbers are first-year estimates from Plunge, which sells finished tubs, so treat them as one company’s view.
| Option | Upfront | Ongoing | Effort | Temperature control | Sanitation |
|---|---|---|---|---|---|
| Bathtub or bin with ice | Low | Ice every session | Haul and drain each time | Ice only, drifts warm | Fresh water each use |
| Chest freezer conversion | Plunge estimates $2,500 to $4,000 first year | Power, filters, sealant repairs | High build effort | Compressor, needs sensor and timer | Add-on filter and sanitizer |
| Barrel or inflatable with chiller (DIY assembly) | Plunge estimates $3,500 to $6,000 first year | Power, filters | Moderate | Chiller | Add-on filter |
| Tru Grit Fitness Inflatable Ice Bath | $999 | Ice, or add a chiller later | Low | Ice unless you add a chiller | Drain and refill |
| Cedar tub plus Penguin chiller | $2,554.50 plus $2,641 | Power, filter | Low, hook up hoses | Chiller, low 40s F | Filter kit included |
| All-in-one hot and cold tub | $7,999 | Power, filter | Lowest | 37 F to 104 F | Ozone and filter |
The hidden costs of going DIY
Ice adds up fast
Plunge puts ice at $1,000 to $8,000 per year depending on usage. Your number depends on your local price and habits, so do the math yourself: bags per session times price per bag times sessions per month. As a worked example, if you use 6 bags at $4 each, that is $24 per session, or $288 a month at three sessions a week. Plug in what ice costs near you.
Compare that with running a chiller. Penguin states its chiller costs $18 to $28 a month at $0.12 per kWh. Our cold plunge electricity cost guide works through that math at other rates.
Water sanitation
Unfiltered ice water has to be dumped often, and adding a pump, filter, and sanitizer pushes DIY totals up. Our guide on how often to change cold plunge water covers what filtration buys you.
Insulation and lids
An open container warms up and collects debris. A fitted cover, insulation, and a hose drain all cost extra when you build them.
Electrical work
If your outlet is not already GFCI protected, budget for an electrician either way.
The middle path: buy the chiller, keep the setup simple
If you like the idea of DIY but not the build, pair a ready-made tub with a standalone chiller.
- The Dundalk LeisureCraft Baltic Plunge Tub CT33BP is Eastern White Cedar with an HDPE liner, holds up to 150 gallons, and works with a chiller or ice. Listed at $2,554.50.
- The Dundalk LeisureCraft Polar Plunge Tub CT362PP holds 190 gallons, measures 71 x 33 x 25 inches with angled sides, and includes a drain that fits a garden hose. Listed at $3,444.
- The Penguin Cold Therapy Chiller with Filter Kit is 3/4 HP, rated at 7,500 BTU/hr, runs on 110 to 120 volts at 3.9 amps, and has a 10 foot cord with GFCI protection. The maker says it holds the low 40s F and can reach the high 30s F in good conditions. Listed at $2,641.
- The Gale 3/4 HP Cold Plunge Chiller and Heater cools to 38 F, heats to 104 F, is ETL certified, and has an ozone generator and filter. Listed at $2,999.
- The Coldture Water Chiller cools to 37 F, heats to 105 F, and has Wi-Fi control. Listed at $3,824.
Not sure which chiller fits your tub? See our guide to cold plunge chiller size.
The cheapest bought route is the Tru Grit Fitness Inflatable Ice Bath. It measures 60 x 30 x 37 inches and inflates in 2 to 5 minutes with the included pump. It is listed at $999. See more from Tru Grit Fitness.
If you want no assembly at all, the 69 in. All-in-One Cold Plunge and Hot Tub has a built-in chiller and heater from 37 F to 104 F, listed at $7,999.
Who should DIY and who should buy
DIY with ice makes sense if you want to test cold water a few times before spending much, you plunge occasionally, and you are fine hauling and draining.
Buying makes sense if you plan to plunge several times a week, you want a steady temperature without ice runs, or you do not want to wire anything near water yourself.
Skip the chest freezer conversion if you often plunge alone. Our cold plunge buying guide walks through every tub type in more detail.
A health note: makers describe benefits like recovery and circulation, but those are manufacturer claims. Cold water immersion is not right for everyone. Talk to your doctor first, especially if you have a heart condition, high blood pressure, or are pregnant.
Frequently asked questions
Is a DIY cold plunge cheaper than buying one?
Upfront, a bin with ice is cheaper. Over a year, Plunge estimates $1,000 to $8,000 for ice alone depending on use, so frequent plungers can spend more than a tub and chiller would cost.
Is a chest freezer cold plunge safe?
It carries real risks. Plunge warns about forgetting to unplug before getting in and the lid closing while you are inside. Use GFCI protection, never plunge alone, and have a licensed electrician check the setup.
DIY ice bath vs cold plunge tub: which holds temperature better?
A tub with a chiller. Ice melts and the water warms. The Penguin chiller, for example, is rated to hold the low 40s F.
Can I add a chiller to a DIY tub?
Often yes, if the tub can take the chiller’s inlet and outlet hoses. The Gale chiller says it works with any cold plunge or hot tub with standard connections. Confirm sizing before you buy.
Questions about building or buying? Call us at 866-777-2590, Monday to Friday, 9AM to 6PM PST. Orders of $999 or more ship with free freight, and smaller orders ship for a flat $200. See our return and refund policy before you order.
