Build your own cold plunge.
Freeze on your terms.

A complete DIY cold plunge with chiller, filter, ozone, and tub runs between $520 and $850 for a quality mid-tier build. The chiller is the single biggest line item ($400–$650), followed by the tub ($80–$300). Compare that to $8,000+ for a commercial Plunge brand system with similar functionality. See our budget build guide for the full itemized breakdown.

For the first few weeks of experimenting, ice is fine — about 40 lbs of ice per session for a 50-gal tub. Long-term, that's $4–$8 per session and a daily trip to the store. A chiller pays for itself in 80–150 sessions (3–6 months at 4×/week) and lets you wake up to 39°F water every morning with zero effort. See chiller vs ice comparison for the full math.

Beginners: 55–60°F for 1–2 minutes. Intermediate: 45–50°F for 2–3 minutes. Advanced: 39–43°F for 3–5 minutes. Never go below 38°F — frostbite risk rises sharply. Read our full temperature & timing protocol for the science-backed ramp-up schedule.

With a proper ozone generator (30 min × 3×/week) and a working filter, you can go 3–6 months between full water changes. Without ozone, expect to drain every 2–4 weeks. Without ozone AND without a filter, you're dumping water weekly. See our water care guide for the full maintenance schedule.

Cold plunge is generally safe for healthy adults but contraindicated for people with cardiovascular disease, hypertension, Raynaud's syndrome, pregnancy, or recent surgery. Always get physician clearance if you have any chronic condition. Read our cold plunge safety guide for the full risk checklist.

"Ice bath" traditionally means a tub filled with tap water + bags of ice (typically 35–40°F, no temperature control). "Cold plunge" usually implies a chiller-maintained vessel at a precise setpoint (39–55°F). The physiological effects are similar, but plunges offer repeatability and convenience. See cold plunge vs ice bath for the full breakdown.

Yes — this is one of the most popular DIY approaches. You retrofit a chest freezer with a PVC pond liner, fill it with water, and use the freezer's own compressor (controlled by an Inkbird ITC-308) to maintain temperature. Total build cost is typically $400–$600. See our chest freezer build guide.

Ozone is a gas injected into the water that oxidizes contaminants without leaving chemical residue — preferred for plunges since you don't smell or absorb it. Chlorine is cheaper and longer-lasting but leaves a chemical smell and can irritate skin at cold-plunge concentrations. Most serious DIYers use ozone + a low chlorine residual as backup. See ozone vs chlorine.