Technical analysis: claims vs physics
Marketing writes the claim; thermodynamics grades it. This section shows the working, so you can check us — and every future claim — yourself.
Published analyses
- Can 45 watts cool 1,300 sq ft? We ran the numbers — the 1,300 sq ft coverage claim, audited joule by joule.
- Evaporative cooling physics: the real numbers — latent heat, wet-bulb limits, and a humidity table you can shop with.
Why a review site does arithmetic
Most marketing claims in this category are not lies. They are numbers presented without the conditions that make them true, and the conditions are where the whole story lives. “Cools 1,300 sq ft” is a real sentence about a real device — it just does not say for how long, from what starting temperature, or with what humidity.
These pieces take one claim at a time and put the arithmetic on the page. Not because the arithmetic is hard, but because nobody selling the device is going to do it in front of you. Where a claim survives the calculation, we say that too: evaporative cooling genuinely works in dry air, and a five-watt fan genuinely makes the stream in front of it cooler.
What the calculations keep finding
The same failure repeats across brands: a coverage area or a temperature drop borrowed from compressor air conditioning, attached to a device that draws a fraction of the power. A unit that pulls 5 W and one that pulls 1,000 W cannot deliver the same result, and no arrangement of ice or wicking closes a gap of that size.
That is why our reviews mark undisclosed wattage as a scoring problem rather than a footnote. Without a power figure, no claim about temperature can be checked at all — which is convenient for whoever chose not to publish it.
How these pieces work
Each analysis states the claim verbatim, lists the physical constants involved, runs the arithmetic step by step, and ends with a plain-English verdict that feeds directly into our product scores. No lab theatre, no invented measurements — where we haven’t measured, we calculate, and we say which is which.
More from this section
Can 45 watts cool 1,300 sq ft? We ran the numbers
Can 45 watts cool 1,300 sq ft, as personal-cooler marketing claims? We audit the physics: heat loads, latent heat and airflow, then say what 45 W really buys.
Read More →
Evaporative cooling physics: the real numbers behind the breeze
Evaporative cooling physics without hand-waving: latent heat of 2,260 J/g, wet-bulb limits by humidity, why ice helps, and a table you can shop with.
Read More →