Peltier elements are technically heat pumps and can be measured with a coefficient of performance, but their COP varies dramatically with temperature difference and current applied, and in practical operating conditions the COP is between 0 and 'very bad' (approaching 0), compared to vapor-compression heat pump COP of 1-3, explaining their fundamental unsuitability for general cooling applications.
causalpending
Evidence Quote
“In theory, if everything is perfect and you can run these at very low current, you can get a COP between 1 and 2. But that will hardly generate any cooling at all, so in practice, the COP of a device using a Peltier element for cooling is somewhere between zero and very bad.”
Created: 8/13/2026, 9:53:39 AM
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