Your question is not very clear but here’s our answer based on our interpretation.
There are electric forced-air heaters that may be set to low or mild weather or high or cold weather.
There is a set button on the heater to adjust the heater’s output. The mild weather setting only uses a fraction of the power (generally half of the maximum output). The cold weather setting uses the maximum output.
The thermostat controls the heater, regardless of the setting. When the temperature controlled by the thermostat requires heating, the forced-air heater will start. The duration of the heating cycles vary according to the outdoor temperature AND the generator setting. If the generator is set to mild weather, when the outdoor temperature is low, the cycles may be very long and never entirely meet the heating demand.
Neither of the settings is energy-efficient. Long, low-power cycles provide moderate but steady heat and shorter high-power cycles provide more intense heat in less time. The settings depend on your personal preference but do not impact your consumption.