THIS IS A FINAL REPORT OF A STUDY OVER A FOURTEEN MONTH PERIOD FROM APRIL, 1959 TO JUNE, 1960 OF HEATING AND COOLING TWO SCHOOL CLASSROOMS AND A COMPARISON WITH A THIRD CLASSROOM IN WHICH THERE WAS HEATING AND FRESH AIR CIRCULATION ONLY. ALL THREE ROOMS HAD AN AIR-FLOW DISTRIBUTION SYSTEM. A TYPHOON HEAT PUMP PROVIDED HEATING AND COOLING IN ONE ROOM AND AN ARKLA-SERVEL ABSORPTION UNIT SERVED THE OTHER. THE THIRD ROOM WAS HEATED BY A HAYES DIRECT FIRED GAS FURNACE. OBJECTIVES OF THE STUDY WERE--(1) TO DETERMINE THERMAL DIFFERENCES BETWEEN THE TWO ROOMS WHICH WERE HEATED AND COOLED AND THE THIRD WHICH HAD ONLY HEATING AND VENTILATION, (2) TO DETERMINE HOURS OF COOLING AND HEATING, (3) TO DETERMINE COOLING LOADS AS THEY VARY WITH OUTSIDE TEMPERATURE AND THE EFFECT OF AIRFLOOR, AND (4) TO DETERMINE UTILITIES CONSUMPTION OF THE HEAT PUMP, ABSORPTION UNIT, AND THE CONVENTIONAL FURNACE. NUMEROUS VARIABLES WERE CONTROLLED FOR MORE ACCURATE COMPARISON. A SUPPLEMENT CONTAINS AN OPERATING COST ANALYSIS. (RH)