Why is it more hot up stairs than down stairs?

It is generally hotter upstairs than downstairs due to the principle of convection, where warm air rises and cooler air sinks. As heating systems operate, warm air generated moves upwards, accumulating in upper levels. Additionally, factors like roof exposure to sunlight and limited ventilation can contribute to increased temperatures upstairs. This phenomenon can be particularly noticeable in homes with less insulation or inadequate airflow.