Patent ID: 8214085

Claim:
A method for controlling a ventilator or ventilation system for the exchange of air from a basement or crawlspace of a building to an exterior environment of the building, the method comprising: obtaining temperature, humidity and/or dew point measurements of the air within the basement or crawlspace over time; determining trends in the temperature, humidity and/or dew point measurements of the air within the basement or crawlspace based on said measurements obtained over time; and adjusting a rate of air exchange from the basement or crawlspace to the exterior environment based on the determined trends, wherein the rate of air exchange from the basement or crawlspace to the exterior environment is lowered if the humidity and/or dew point of the air within the basement or crawlspace is increasing, and the rate of air exchange from the basement or crawlspace to the exterior environment is increased if the humidity and/or dew point of the air within the basement or crawlspace is decreasing.