Ford MUSTANG 2022 Owner's Manual page 155

Starting and Stopping the Engine
The heater uses 0.4 to 1.0 kilowatt-hours
of energy per hour of use. The system does
not have a thermostat. It achieves
maximum temperature after
approximately three hours of operation.
Using the heater longer than three hours
does not improve system performance and
unnecessarily uses electricity.
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2022 Mustang (CZG) Canada/United States of America, Vehicles Built From: 27-09-2021, enUSA, Edition date: 202110, First-Printing