How We Research and Correct Our Guides
Home Performance Guide covers home saunas, cold plunges, golf simulators, hyperbaric chambers and red light panels. This page explains where the numbers in our guides come from and what happens when one of them turns out to be wrong.
We review documents and do not test products
We have not tested the products in our guides, and we do not describe using them. A review here is a documents review. We read what the maker publishes about size, power, weight, clearances, warranty, shipping and returns. Then we report where those documents disagree with each other.
The documents we read
For each product we start with the maker's own publications:
- product pages
- spec sheets
- manuals and assembly guides
- help center articles
- warranty, shipping and return policies
- price tables, brochures and financing pages
For permits, wiring and floor loads we read the relevant code section or a local government's permit page.
Which sources count
A specification goes into a guide only when it traces to the maker's own documents or to a code or government source. A maker's blog counts as the maker speaking, and we label it as the blog. When it disagrees with the maker's spec sheet or support pages, we show both figures.
Retailers are a source only for their own prices. Other blogs, roundups and contractor pages appear only to show what a search turns up. We do not repeat their figures as fact.
Some code texts are behind a paywall. When we check a code figure against a state's adopted version or a secondary source instead, the guide says so.
When a maker's documents disagree
When two of a maker's documents give different figures, we print both and say which document each came from. If one is newer, we say which one to plan from. If we cannot tell which is right, we say so and suggest getting the maker's answer in writing.
Brands that pay us commissions get the same treatment. We publish what a partner's documents say even when it is unflattering to that partner. No partner approves a guide before it is published.
Dates, prices and our own math
Each guide ends with a sourcing line that names the documents we read and the month we read them, such as "Verified September 2026." Reviews of a single brand give the exact day. A price is what the store listed on the day we checked. We write it as of that day, for example "As of October 5, 2026, the price is $1,100." If a price changes after that, the date shows when we read it.
When a number is our own arithmetic, such as amps worked out from published watts, the guide says so. When a maker publishes no figure, the guide says that. We do not borrow the number from another site.
What we leave out
Our guides make no health or medical claims, and they do not repeat a maker's claims of that kind. Everything on this site is general planning information, and none of it is electrical, structural, code or medical advice. The manufacturer's instructions and your local building department govern any installation.
Photos
A photo credited "Image: SaunaKits.com" shows the model named in its caption. We use it with the retailer's written permission.
Stock photos are illustrations. We do not caption a stock photo as a specific model. Our single-brand reviews also state that their photos are illustrations.
How affiliate links work here
Home Performance Guide earns commissions on some links. Every page with affiliate links says so in its first line, before any affiliate link. Affiliate links open in a new tab and are marked as sponsored for search engines. Several products we cover pay us nothing, and those are linked normally.
Commission rate does not decide what we cover. Our affiliate disclosure page lists every partner whose links appear on this site.
Corrections
If you find an error, email hello@homeperformanceguide.com and include the source. We check it against the current documents and fix what is wrong. Manufacturers can write to the same address. A maker's email does not replace its published documents. If those still say otherwise, the guide shows both.
Keeping guides current
Makers revise their pages, manuals and prices. Before a guide is published, every claim in it is checked again against its source in a separate pass. Claims that fail are fixed or cut. Prices are checked again on the day a guide is published. Every guide is re-checked at least every 6 months, and its sourcing line gives the month of the last check.
When we find that a price, sale or document a guide cites has changed, we re-read that guide's sources. Its sourcing line then says what was re-checked and when.
Last updated October 5, 2026.