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At what temperature range do many cold receptors have their strongest steady response?

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thermoreception in polar bears — Thermoreception Warm-blooded animals, such as polar bears, maintain stable body temperatures and adapt to substantial geographic and seasonal temperature fluctuations. Thermal adaptation is supported by the function of sensory structures called thermoreceptors.

In the context of thermoreception, the static activity—or steady response—of many cold receptors reaches its maximum at temperatures ranging from 20 to 30 °C (68 to 86 °F).1

While this range represents the peak for many receptors, some specific thermoreceptors exhibit lower thresholds (below 30 °C [86 °F]) and achieve their maximal activity at even colder temperatures, specifically below 20 °C (68 °F).1