In the old days, the wind and other uncontrolled forms of air leakage ventilated buildings. Most people no longer accept the cold, drafty houses of the old days. Now houses are expected to be cozy, draft free and energy efficient. An airtight home is fine, as long as it comes with a controlled ventilation system. Modern building materials tend to make newly constructed homes much tighter than old ones. Plywood, house wrap, better windows, caulk and expanding foam are a few examples of common products that tighten a house. Some builders inadvertently build houses much tighter than intended. In any home, uncontrolled air leakage is a unstable ventilator. The only way to ensure adequate ventilation is to install some type of automatically controlled ventilation system.

Ventilation standard for cooling house

Exhaust fans in the kitchen and bathrooms are standard equipment in all homes. They provide spot ventilation to expel moisture and odors from limited areas. With spot ventilation, people sense an obvious problem and then manually turn over a switch to solve the problem. The controlled ventilation is intended to maintain overall indoors air quality. It differs from spot ventilation in three ways like it affects the entire living space. It provides makeup air from outside and it is controlled automatically. It is called controlled ventilation to distinguish it from the more limited spot ventilation.

Function of ventilation to keep house cool
Ventilation systems are more than exhaust fans. They serve three important functions to keep the house cool. They expel stale air containing water vapor, carbon dioxide, airborne chemicals and other pollutants. They help to draw in outside air, which presumably contains fewer pollutants and less water vapor. It distributes the outside air throughout the house and control system operation automatically.
How it works?
The basic ventilation system has two elements. There is a fan to pull stale air out from. High moisture areas like the kitchen, utility and bathrooms. Second is the makeup air supply. Outside air is delivered around the house, with one supply point in each bedroom and at least one in the living area. By properly locating the pickup and supply points, it helps to cool the house by making outside air travel through the entire house.

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