Plunge All-In vs DIY Chest Freezer Conversion: True Cost Comparison
I built a DIY chest freezer cold plunge and bought a Plunge All-In. Here's the honest cost comparison and which setup is right for which type of person.
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I am uniquely positioned to write this article because I’ve done both, at the same time, in the same garage.
My DIY chest freezer conversion — a Frigidaire 7.0 cu ft chest freezer with a Penguin Chiller connected to a re-purposed stock tank — sat on the left side of my garage for eight months. My Plunge All-In sits on the right side. I plunged in both. I tracked the costs. I know which one I use now.
Let me give you the completely honest breakdown.
The DIY Cold Plunge: What You’re Actually Building
A chest freezer cold plunge is a misunderstood category. You’re not plunging inside a chest freezer — you’re using the chest freezer’s compressor to cool water in a separate tub.
The standard DIY setup:
- A stock tank or large tub ($200-400) — the vessel you actually plunge in
- A chest freezer ($500-700) — or a dedicated Penguin Chiller ($600-800) as the cooling unit
- Pump + hose kit to circulate water from the tub through the cooling element and back ($80-150)
- Filtration ($50-100)
- Miscellaneous fittings, sealing compound, etc. ($30-50)
Total DIY build: approximately $960-$1,400 depending on choices
Alternatively, you skip the chest freezer conversion entirely and use a purpose-built Penguin Chiller connected to a stock tank. This is cleaner and more reliable than a converted chest freezer, though slightly more expensive than the chest freezer alone.
Specs Comparison
| Feature | Plunge All-In | DIY (Penguin + Stock Tank) |
|---|---|---|
| Price | ~$4,990 | ~$1,200-$1,600 |
| Setup Time | 30-45 minutes | 3-8 hours (half-day project) |
| Interior Volume | ~65 gallons | ~80-120 gallons (stock tank size) |
| Chiller Power | 1/2 HP proprietary | 1/4 HP Penguin (1/3 HP available) |
| Min Temperature | 37°F | ~50°F (1/4 HP Penguin) |
| Filtration | Built-in ozone + filter | DIY filter setup |
| Warranty | 5 years | Penguin Chiller: 1 year; tub: none |
| Aesthetics | Polished, designed | Functional, industrial |
| Electrical | 110V, 15A | 110V, 15A (Penguin) or 220V (chest freezer) |
| Drainage | Drain valve included | Depends on tub selection |
| Cover | Included | DIY or aftermarket |
The True Cost, Year by Year
Let me be rigorous here because the upfront cost difference is so significant it obscures the total cost picture.
Plunge All-In:
| Cost Item | Amount |
|---|---|
| Purchase price | $4,990 |
| Electricity (chiller, year 1) | ~$360 |
| Water treatment chemicals | ~$120 |
| Filter replacement | ~$60 |
| Water (2-3 changes/year) | ~$30 |
| Year 1 total | $5,560 |
| Year 2 total | $570 |
| Year 3 total | $570 |
| 3-year total | $6,700 |
DIY Build (Penguin Chiller 1/4 HP + stock tank):
| Cost Item | Amount |
|---|---|
| Penguin Chiller 1/4 HP | ~$700 |
| Stock tank (Rubbermaid 100 gallon) | ~$300 |
| Pump and hose kit | ~$120 |
| Filtration setup | ~$80 |
| Miscellaneous (fittings, sealant, etc.) | ~$50 |
| Year 1 build cost | ~$1,250 |
| Electricity (year 1) | ~$420 (Penguin runs less efficiently than Plunge chiller) |
| Water treatment chemicals | ~$120 |
| Filter replacement | ~$40 |
| Repairs/adjustments (year 1 average) | ~$80 |
| Year 1 total | ~$1,910 |
| Year 2 total | ~$660 |
| Year 3 total | ~$660 |
| 3-year total | ~$3,230 |
The math: Over three years, the DIY system costs ~$3,230 vs the Plunge All-In’s ~$6,700. You save approximately $3,470 over three years with the DIY approach.
However: the Plunge All-In has a 5-year warranty. If any component fails after year 1 on the DIY setup, that’s an out-of-pocket repair. If anything fails on the Plunge All-In in years 1-5, Plunge replaces it.
The Setup Process: What a Half-Day Project Looks Like
Plunge All-In:
- Receive delivery (weighs ~200 lbs; plan for two people to move it)
- Position in your space
- Connect garden hose to fill
- Connect power cord to 110V outlet
- Fill and turn on chiller
- Wait 6-12 hours for initial cool-down
Total time: 30-45 minutes of active work, then waiting.
DIY (Penguin Chiller + stock tank):
- Position stock tank
- Drill hole(s) in tank for pump/return fittings
- Install bulkhead fittings and seal (allow 24 hours for sealant cure)
- Connect pump inside tank to outlet hose
- Connect Penguin Chiller inline: tub → pump → Penguin inlet → Penguin outlet → tub
- Install filtration in the loop
- Fill with garden hose
- Prime pump (remove air from lines)
- Test for leaks at all fittings
- Power on Penguin and test cooling performance
Total time: 4-8 hours on build day, plus 24 hours waiting for sealant.
Where builds go wrong:
- Bulkhead fitting not seated correctly → leak at the tank wall penetration
- Air in pump lines → pump cavitation noise or no flow
- Penguin Chiller connections not tight → minor leak at chiller fittings
- Pump too small for tub volume → inadequate flow rate, uneven cooling
I had an air-in-the-pump issue on my first build that took two tries to resolve. My neighbor who built a similar system had a bulkhead leak that required draining, re-sealing, and 24-hour wait. These are solvable problems, but they require patience and some comfort with plumbing.
Cooling Performance: The Real Difference
The Penguin Chiller 1/4 HP cools water down to approximately 50°F in a 100-gallon stock tank with ambient temperature of 70°F. Getting significantly colder requires either a more powerful Penguin (1/3 HP, ~$900) or a different compressor approach.
The Plunge All-In reaches 37°F in a ~65-gallon volume. The smaller volume combined with a more powerful, purpose-built chiller means the Plunge All-In runs colder.
Does this matter for most users? Honestly, no. The research-supported cold plunge temperature for maximum benefit is 50-59°F. Getting to 40°F produces diminishing marginal returns on physiological outcomes and primarily just makes the experience more intense. Most serious cold plunge practitioners I know use 50-55°F as their target, which both systems achieve.
Where it matters: if you’re targeting very cold temperatures (sub-50°F) for specific athletic performance protocols, or if you live in a hot climate where ambient temperature is 90°F+ and the Penguin struggles to reach 50°F.
Electricity Usage: Closer Than You’d Think
A common DIY assumption: the Plunge All-In must use more electricity because it’s more powerful. This is wrong.
The Plunge All-In’s purpose-built chiller is more thermally efficient than the Penguin Chiller for the same temperature maintenance task. The insulation on the Plunge All-In tub is also superior to a Rubbermaid stock tank, meaning the chiller runs less frequently to maintain temperature.
In my garage (Southern California, average 68°F year-round):
- Plunge All-In electricity: ~$28-32/month
- DIY Penguin + stock tank: ~$33-38/month
The DIY system uses more electricity to do a similar job. Not dramatically more, but more.
In hot climates, this gap widens. A stock tank in a garage at 95°F in August will have the Penguin running nearly continuously. The Plunge All-In’s better insulation and more powerful compressor handles high ambient temperatures more efficiently.
Water Quality: Surprisingly Similar
Both systems require the same basic water chemistry maintenance: pH 7.2-7.8, free chlorine 1-3 ppm, alkalinity 80-120 ppm. With weekly maintenance, both systems produce clean, clear water indefinitely.
The Plunge All-In’s built-in ozone system reduces the chemical chlorine burden — I maintain 0.5-1 ppm free chlorine (versus 1-2 ppm on the DIY) because the ozone handles additional sanitization. This is a minor advantage.
DIY users often set up a single-cartridge filter housing in the plumbing loop, which performs adequately. The Plunge All-In’s filtration system is slightly better but not dramatically so for single-user plunging.
Warranty and Reliability: The Hidden Cost Factor
The Plunge All-In’s 5-year warranty covers parts and labor on the chiller unit — the most expensive component. If the chiller compressor fails in year 3, Plunge replaces it. This failure on a DIY setup would cost $700-900 in replacement parts.
The Penguin Chiller comes with a 1-year warranty. After year 1, you’re on your own.
Chiller compressors generally have long lifespans (7-15 years for quality units), so this may not matter in practice. But the peace of mind of a 5-year warranty on a $5,000 investment is real, and it’s part of what you’re buying with the Plunge All-In.
Aesthetics: Genuinely Matters for Outdoor Spaces
I didn’t expect this to affect my decision-making, but it did.
The Plunge All-In looks like a product. The clean white/gray tub with matching chiller housing is something I’m comfortable having visible in my garage or on a patio. Guests see it and understand what it is.
The DIY setup looks like a DIY project. A Rubbermaid stock tank with a Penguin Chiller attached via black hose and zip ties communicates “I built this myself” unambiguously. For a garage that’s your personal space, this is fine. For a backyard where guests see it or for a more finished space, the aesthetics matter.
Who Should Build the DIY System
- You have basic plumbing confidence and enjoy DIY projects
- You want the lowest possible cost to entry
- You don’t need sub-50°F temperatures
- You’re comfortable with the maintenance and repair responsibility
- You don’t mind the aesthetic of a functional but industrial setup
- You want to size a larger tub (100+ gallons) that isn’t available in the Plunge line
Who Should Buy the Plunge All-In
- You want a turnkey experience with zero plumbing involved
- The 5-year warranty is important to you
- You want the coldest possible water (sub-45°F)
- Aesthetics matter and you want a polished-looking setup
- Your time has significant value and a half-day build project isn’t appealing
- You can absorb the $3,500 premium for peace of mind and convenience
My Honest Verdict
I use the Plunge All-In. The DIY setup sits in my garage as a backup and as a larger capacity option when I want a longer soak.
If I were making the decision again with honest self-reflection: the Plunge All-In was the right call for me because I use it daily and I wanted the setup to feel permanent and intentional rather than improvised. The warranty matters to me on a product I use every day.
But the DIY system works. It’s been reliably producing 52°F water for eight months with minimal issues. If I were buying for the first time with price as the primary constraint, I’d build the DIY, live with it for a year to confirm my cold plunge commitment, and then potentially upgrade.
The DIY path is not the cheap path to the Plunge experience — it’s a genuinely different product with different tradeoffs. Know which tradeoffs you’re choosing.
What You’ll Need for Either Path
| Product | Plunge All-In | DIY Build | Est. Price |
|---|---|---|---|
| Penguin Chiller 1/4 HP | No (chiller included) | Yes | ~$700 |
| Stock tank (100 gal Rubbermaid) | No (tub included) | Yes | ~$300 |
| Pump kit | No (built-in) | Yes | ~$80-120 |
| Bulkhead fittings + sealant | No | Yes | ~$30-50 |
| Water test strips | Yes | Yes | ~$15-25 |
| Dichlor chlorine | Yes | Yes | ~$20-35 |
| Cover (outdoor) | Included | Aftermarket | ~$50-100 |
Check price on Amazon for Penguin Chiller Check price on Amazon for Rubbermaid stock tank Check price on Amazon for Plunge All-In
Final Thoughts
The $3,500 price gap between the DIY setup and the Plunge All-In is real. So is the 5-year warranty, the turnkey setup experience, the better aesthetics, and the colder temperature capability.
Neither choice is objectively wrong. The right answer depends on your budget, your comfort with DIY, and how seriously you approach your cold plunge practice.
If you’re reading this article and seriously considering a cold plunge setup, you’re already committed enough to benefit from either option. Start wherever your budget allows and optimize from there.
Check price on Amazon — Plunge All-In ($4,990)
Check price on Amazon — Penguin Chiller 1/4 HP ($700)