The researchers studied how people feel in different temperatures when the air is warmer at the head or feet. They found that people are more sensitive to temperature changes at their upper body and feel warmer with their head than their feet. They recommend a range of -8 to 7 degrees Celsius for comfortable temperatures when the air is warmer at the head, and -7 to 6 degrees Celsius when it's warmer at the feet. They also created a new way to measure how comfortable people are in these conditions, which is more accurate than the current methods.