device 30 and the economizer system 31 are integrated in one common economizer housing 38 or the control device 30 is integrated in a separate controller housing connected through control wires to the economizer system 31 the control device 30 is configured to reduce automatically in the economizer system 31 the outdoor air intake based on the value of a shut off control setting for a measured outdoor air quality for example the air conditioning economizer system 31 includes sensors for measuring the temperature humidity dew point and or enthalpy of the outdoor air in an embodiment the economizer system 31 may also include sensors for measuring the air temperature and or enthalpy of return air to the economizer system 31 one skilled in the art will understand that the air conditioning economizer system 31 may include other sensors and modules for determining various other types of air quality considered useful for controlling automatically based thereon the outdoor air intake in the economizer system 31 as illustrated schematically in fig3 in an embodiment control device 30 includes a data store for storing the type of sensor s 36 used by the economizer system 31 for example the type of sensor s 36 is stored in the control device 30 at manufacturing time factory settings or at installation time e g entered manually or detected automatically from the economizer system 31 or the sensors in fig3 reference numeral 32 refers to a location determination module for determining a geographical location in various embodiments the location determination module 32 includes preferably a user interface 50 for entering and receiving geographical location data defining the geographical location alternatively the location determination module 32 includes a receiver for a satellite based positioning system or an interface for receiving geographical location data from an.