The diagram illustrates several ways of heat loss and energy waste in a house due to the airflow in building. Overall, it can be seen that cool air enters from slits in the pottom part of the house. Meanwhile, hot air runs out the house through its upper structure.
Fresh air from outside the structure get into the house through several ways, which causes the house becoming cooler. Some small slits between the wall and window or door can be passed by air from the outside so that the house is filled by cool air. Air also is able to leak into a house through several gaps which unintentionally are made for circulation, such as around the dryer vent, kitchen fan vent, and and electrical faucet. Crawl spaces also is filled by cool air because small slits around outdoor faucet.
The heat inside the building is carried out by the air which leaks out of the house. As such air enters the bottom part of the house, prior air within the house which was previously is warmed by energy waste such as recessed light, is pushed into the upper side of the building. After that, attic hatches and small gaps between the ceiling and the wall, bathrom fan vent, or lamp, allow this air leaking out.
