Yes, there are hot tubs that can also be cold. They use a combined chiller and heater to run the same water hot or cold on demand, usually from about 37°F up to 104 to 107°F. One unit gives you a warm soak and a cold plunge, which is the basis of contrast therapy. The Modouge All-In-One covers 35 to 107°F in a single tub. Here is how these units work and what to look for.
A hot tub that can also go cold is exactly what it sounds like: one tub, one body of water, that you can set to a warm soak or a cold plunge whenever you want. Instead of buying a hot tub and a separate cold plunge, you get both functions from a single machine. For anyone interested in contrast therapy, alternating hot and cold, that is the efficient way to do it.
Here is how these combo units work, the temperature range to expect, and why one tub usually beats two separate ones.
Can a Hot Tub Also Be a Cold Plunge?
Yes. A combined hot-and-cold tub pairs a heater with a chiller, so it can warm water for a soak or chill it for a plunge from the same fixture. You set the temperature, and the unit drives the water hot or cold. Typical ranges run from about 37 to 39°F on the cold side up to 104 to 107°F on the hot side, which covers both a proper cold plunge and a relaxing hot soak.
This is different from a traditional hot tub, which only heats, and from a basic cold plunge, which only cools. A true hot-and-cold unit does both, switching between modes on demand. The Modouge All-In-One is one example, running the full 35 to 107°F range from a single tub.
How Hot-and-Cold Tubs Work
The key part is the temperature system. A combined unit has both a chiller and a heating element tied to a smart controller. You pick a target temperature, and the system either pulls heat out of the water or adds it until the water matches. Filtration runs the whole time to keep the water clean across both modes.
Most are app or touchscreen controlled, so you can schedule a warm soak for the evening or have the water cold and ready for a morning plunge. The better units hold the temperature steady through your whole session rather than drifting, which matters for both a comfortable soak and an effective plunge.
How Combo Units Compare
| Unit | Temperature range | Notes |
|---|---|---|
| Modouge All-In-One | 35 to 107°F | One tub, 1HP chiller + heat, ozone filtration |
| Renu Cold Stoic 3.0 | 37 to 104°F | 0.5HP chiller and heater, app control |
| Inergize Hot & Cold | 37 to 105°F | App-controlled, smaller capacity |
| Aquavoss Model 2 | 39 to 104°F | Often two separate bodies of water |
Ranges drawn from each maker's listed specs and 2026 roundups. Note that some combo setups, like the Aquavoss, use two separate tubs with two controllers, while a single-tub unit like the Modouge does both from one body of water and one footprint.
Why One Tub Beats Two Separate Ones
A hot tub plus a separate cold plunge means two purchases, two footprints, two sets of maintenance, and two power draws. A single hot-and-cold unit collapses all of that into one. You save space, you save money, and you get the contrast cycle without stepping between two machines.
It also makes contrast therapy practical at home. Alternating hot and cold is the protocol many athletes and recovery fans use, and it is far easier when one tub does both. You can soak warm, then drop the temperature, or run two tubs side by side if you have the space, but most people do not need to.
The Modouge All-In-One: Hot and Cold in One
The Modouge All-In-One Cold Plunge is built exactly for this. Its 1HP chiller and heater cover 35 to 107°F, so the same tub gives you a 37°F cold plunge or a 104°F-plus hot soak, set from the app or the touchscreen. Ozone and 3-stage filtration keep the water clean for about a month across both modes.
And it installs like an appliance, not a spa. It plugs into a standard 110V outlet and fills with a hose, with no plumbing or electrician, so it goes on a patio, deck, or garage the same day. At $5,290 it costs less than buying a hot tub and a cold plunge separately, and far less than a premium two-tub contrast setup.
The Bottom Line
Hot tubs that also go cold are real, and a single-tub version is the simplest way to get both a warm soak and a cold plunge. Look for a true chiller-and-heater unit with a wide temperature range and steady control. The Modouge All-In-One covers 35 to 107°F in one tub with no plumbing, and the Nomad chiller adds cold to a tub you already own.
Shop the All-In-One Hot & Cold Tub See the Portable Chiller
Frequently Asked Questions
Are there hot tubs that can also be cold?
Yes. Combined hot-and-cold units use a chiller and a heater to run the same water warm or cold on demand, typically from about 37°F up to 104 to 107°F. The Modouge All-In-One covers 35 to 107°F in a single tub.
How cold can a hot-and-cold tub get?
Most reach 37 to 39°F on the cold side, which is a proper cold plunge temperature. The Modouge All-In-One goes to 37°F and holds it, while also heating up to 107°F for a warm soak.
Is one hot-and-cold tub better than buying both separately?
Usually yes. One unit means one footprint, one set of maintenance, and one purchase, and it makes contrast therapy easy. Buying a hot tub and a cold plunge separately costs more and takes more space.
Do hot-and-cold tubs need plumbing?
Self-contained ones do not. The Modouge All-In-One plugs into a standard 110V outlet and fills with a hose, with no plumbing or electrician. Permanent built-in spas are the exception.
What temperature should I use for hot and cold therapy?
For contrast therapy, a warm soak around 100 to 104°F and a cold plunge around 50°F, alternating, is common. Always ease into cold water and check with a doctor first if you have any heart or circulatory condition.
This article is for general information and is not medical advice. Hot and cold water therapy carry risks. Talk to a healthcare provider before starting, especially if you have a heart condition, high blood pressure, are pregnant, or have a circulatory disorder.
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