Cold Plunge & Sauna Financing: Affirm, HSA/FSA & More
Saunas and cold plunges are real investments, so it’s worth knowing your payment options — and the honest math behind each. Total the project first with our sauna cost and cold plunge cost guides.
1. Paying outright
Simplest and cheapest overall — no interest, no eligibility checks. If you can, it’s the lowest total cost. Just remember to budget the running costs too (a chiller’s electricity, a sauna’s heating), not only the sticker price.
2. Brand financing (Affirm & similar)
Most major brands offer monthly financing, frequently through Affirm. Qualified buyers sometimes get 0% APR; otherwise rates range up to around 36% APR depending on credit and term, and a down payment may be required. As an illustration brands cite, a $6,500 purchase at 0% over 24 months is about $271/month.
3. HSA/FSA with a Letter of Medical Necessity
This is the option many buyers miss. Saunas and cold plunges aren’t automatically HSA/FSA-eligible, but if a licensed clinician issues a Letter of Medical Necessity (LMN) for a diagnosed condition, the purchase can become a qualified medical expense — letting you pay with pre-tax dollars for roughly 30% effective savings.
Brands commonly enable this through TrueMed. The flow:
- Select TrueMed / “Pay with HSA-FSA” at checkout.
- Complete a brief health survey; a licensed provider reviews it.
- If approved, you receive an LMN within 24–48 hours.
- Pay with your HSA/FSA card — or pay normally and submit the LMN + receipt to your administrator for reimbursement.
Eligibility and what your plan accepts can vary by administrator, and you should generally only submit expenses dated on or after the LMN. It’s a tax-advantaged benefit, not a discount — and not a guarantee. (We’ll cover this in more depth in our dedicated HSA/FSA guide.)
4. Spend less in the first place
Financing aside, the cheapest money is the money you don’t spend: consider a DIY build, a smaller unit, or a budget pick from cold plunges under $5,000. A right-sized purchase beats financing an oversized one.
FAQ
Can I finance a sauna or cold plunge?
Yes. Many brands partner with Affirm (and similar lenders) to spread the cost over months, sometimes at 0% APR for qualified buyers, with rates typically ranging up to around 36% APR depending on credit and term.
Can I use HSA or FSA funds for a cold plunge or sauna?
Potentially. They aren’t automatically eligible, but with a Letter of Medical Necessity (LMN) from a licensed clinician tied to a diagnosed condition, a sauna or cold plunge can qualify as a medical expense. Services like TrueMed facilitate this at checkout.
How much can HSA/FSA save me?
Because you’re spending pre-tax dollars, the effective saving is roughly your tax rate — often around 30%. The exact amount depends on your tax bracket and your plan administrator’s rules.
How does TrueMed work?
You select TrueMed at checkout, complete a short health survey, and a licensed provider reviews it; if approved you get a Letter of Medical Necessity within 24–48 hours. You can pay with an HSA/FSA card, or pay normally and submit the letter plus receipt to your administrator for reimbursement.
Sources
- Truemed — How to make a sauna HSA/FSA eligible (LMN process, ~30% savings). truemed.com
- Plunge — HSA/FSA eligibility via TrueMed (survey, LMN, reimbursement). plunge.com
- Redwood Outdoors — Affirm financing terms (0–36% APR example). redwoodoutdoors.com
Educational only. Codes and conditions vary — confirm locally and consult a licensed professional.