A poultry house environmental controller’s temperature sensors are in a sense its eyes. In order for the controller to properly control the environment within a poultry house it must be able to “see” what is happening throughout the house. For instance, if a house has only one temperature sensor a controller can only see what is happening in one very small area of the house. This means that conditions in another area of the house may be very different and the controller may not be aware of... it. On the other hand, a controller does not need twenty temperature sensors to get an accurate picture of what is happening throughout the house. You could think of it as how many places you personally would have to stand in a house to get a good idea of what is happening. In most cases five or six locations throughout the house would prove sufficient and therefore five or six temperature sensors are required in order for the controller to get a good picture of what is happening over the length of a poultry house.