The air is leaking from every ventilation and going out in the first floor, in the roof.

IELTS WRITING TASK 1 : CAMBRIDGE WORKBOOK 5.5 - 6.5 | UNIT 3 PAGE 35

The figure illustrates the process of heat lost and energy wasted that caused by air circulation of the house. Overall, while air that leaking is coming from every ventilation both in the underground and in the upper floor, air that is going out only occurs in the first floor, exactly in the roof.

The process is started when fresh air come from the outside through some holes. There are crawl space, kitchen fan vent, windows and door in the center room, vent in the drying room, and electrical outlet in the toilet. Since the rooms contains holes that connected to the outer of the home, it makes air enters to the house both in the underground floor and in the up floor.

Next, when the fresh air is already situated inside the home for replacing the heat air, so the warm air leaking out through recessed lights, attic hatch, bathroom fan vent plumbing stack vent, and chase. As a result, it makes the rooms temperature in the house become stable.

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Hi.
here are a few corrections for your writing.

... the process of RELEASING heat lost and energy FLOWING INTO THE HOUSE wasted that caused by THROUGH THE air circulation of the house .
... in the underground and in the upper floor, (...) only occurs in FROM the first floor, ...
... when fresh air comeS from the outside ...
Since the rooms contains HAVE holes that connected (...) floor and in the up floor.

Next, when the fresh air is already situated FLOWS inside the home for replacing the heatED air, so the warm air leakSing out through recessed lights, ...

As a result, it THOSE makesthe rooms temperature OF ALL ROOMS in the house become stable.

Note:
1. make sure what you write.
2. Pay attention to plural and singular
3. Order the preposition appropriately