Air conditioning control

Claim 1

IN AN AIR CONDITIONING SYSTEM, IN COMBINATION, MEANS PRODUCING ERROR SIGNALS OF TEMPERATURE INCREASE VALUE, CALLING FOR AN INCREASE IN TEMPERATURE, AND TEMPERATURE DECREASE VALUE, CALLING FOR A DECREASE IN TEMPERATURE, RESPONSIVE TO DEPARTURE OF THE TEMPERATURE OF A SELECTED REGION OF SAID SYSTEM IN A DECREASE DIRECTION OR AN INCREASE DIRECTION RESPECTIVELY, FROM A DATUM TEMPERATURE, HEATING ELEMENTS PROVIDING INCREMENTS OF HEAT IN STEPS, MECHANISM RESPONSIVE TO AN ERROR SIGNAL OF PREDETERMINED AMOUNT OF TEMPERATURE INCREASE VALUE ACTIVATING SAID HEATING ELEMENTS IN STEPS AND PRODUCING INCREMENTS OF HEAT IN SAID SYSTEM LARGER THAN THE AMOUNT NECESSARY TO CORRECT THE TEMPERATURE DEPARTURE CAUSING THE ERROR SIGNAL, SAID INCREMENTS PRODUCING AN ERROR SIGNAL OF TEMPERATURE DECREASE VALUE, SAID MECHANISM RESPONSIVE TO AN ERROR SIGNAL OF A PREDETERMINED AMOUNT OF SAID TEMPERATURE DECREASE VALUE INACTIVATING SAID HEATING ELEMENTS, AND PRODUCING A DEAD BAND OF CONTROL OF SAID HEATING ELEMENTS BETWEEN SAID ACTIVATING AND INACTIVATING SIGNALS, COOLING MEANS EXTRACTING HEAT FROM SAID SYSTEM, CONTROL MEANS FOR SAID COOLING MEANS RESPONSIVE TO SAID ERROR SIGNALS OF SAID TEMPERATURE INCREASE VALUE RENDERING SAID COOLING MEANS INEFFECTIVE BEFORE ACTIVATION OF SAID HEATING ELEMENTS, AND RESPONSIVE TO ERROR SIGNALS OF SAID TEMPERATURE DECREASE VALUE WITHIN SAID DEAD BAND RENDERING SAID COOLING MEANS EFFECTIVE WITHIN SAID DEAD BAND AFTER ACTIVATION OF SAID HEATING ELEMENTS.