Usage Note
Thermostat is a direct technical borrowing and is spelled identically to English. The final t is silent. In cooking recipes it appears with oven-temperature markings: thermostat 6 corresponds to roughly 180 °C.
Examples
"Monte le thermostat, il fait froid."
Natural Translation
Turn up the thermostat, it's cold.
Literal Translation
Raise the thermostat, it makes cold.

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