房屋的热量平衡取决于热量输入和热量损失。通过将熔炉和热水系统的实测燃料消耗量与居住者、太阳辐射和电器的估计热增益相结合，估算了作为室外温度函数的总有效空间热输入。热损失也作为室外温度的函数进行了计算。根据得到的图形关系，对供暖系统效率进行了估算。给出了添加隔热层的几栋房屋的燃料消耗与室外温度关系的变化。在两种情况下，在阁楼和RSI 1上添加RSI 2绝缘层。 5到地下室墙壁（以前未隔热）减少了约30%的燃油消耗。引文:ASHRAE Transactions，1984年，第90卷，pt。密苏里州堪萨斯城2A号

The heat balance in a house depends on heat inputs and heat losses. By combining measured fuel consumptions for the furnace and hot water system with estimated heat gains from occupants, solar radiation, and electrical appliances, total useful space heat inputs were estimated as a function of outdoor temperature. Heat losses were also calculated as a function of outdoor temperature. From the resulting graphical relationships, estimates were made of heating system efficiencies.Changes in the fuel consumption-outdoor temperature relationship are given for several houses to which insulation was added. In two cases, addition of RSI 2 insulation to the attic and RSI 1.5 to basement walls (previously uninsulated) reduced fuel consumption by about 30 percent.