The diagrams illustrate how natural air circulates within a house and how heat loss occurs as a result.
Overall, the airflow system shows that cold air typically enters the house through various openings, while warm air escapes through specific vents, particularly in the attic, contributing to heat loss.
As shown in the diagram, outside air enters the house through open spaces such as windows, vents, the bathroom electrical outlet, the door, and the crawl space. These entry points allow cooler air to infiltrate the interior environment.
In contrast, warm air tends to escape through areas located in the upper parts of the house. The main outlets for air leakage include recessed lighting, the bathroom fan vent, and the plumbing stack vent. These pathways enable heated air to rise and exit, resulting in energy inefficiency.