, I have data for you
I used an Omega HH82 dual thermocouple digital thermometer, one thermocouple measured interior ambient, one measured the A** Interface Temperature, typically abbreviated as AIT.
The type of thermocouples used were fast read film type, (Type K), pictured, very low thermal mass for minimal error contribution.
Why not use a thermal camera? Because a thermal image has no relevance to the desired measurement, with a thermal camera you are measuring the surface temperature of a poor thermal conductor being convection cooled. By using the thermocouple and placing it in the back jeans pocket, at the optimal A** to Seat contact position, we can measure the interface temperature or AIT, directly perceived by the driver occupant.
Test conditions and measurements:
The Bolt drivers side seat heater was turned on to high and the temperature was allowed to stabilize for the duration of 2.5 radio airplay rock songs, or about 10 minutes.
Outdoor ambient as reported on Bolt display 40F
AIT = 107.5
Internal cabin ambient 70.5
Subject was a 165Lb male wearing levi 505 jeans.
And yes, I can only run my stock Bolt LT seat heater on high for a very short duration before I need to reduce the power level to avoid the dreaded "seat heater swamp A**" condition that would result.