Degree Type


Date of Award


Degree Name

Doctor of Philosophy


Physics and Astronomy


The Home Heating Index (HHI), with units of Btu/F(DEGREES)-day-ft('2) or W/C(DEGREES)-m('2), and related quantities have been used to evaluate the energy-efficiency of homes in Ames, Iowa during the winter of 1984-85. From these measurements, it has been discovered that the HHI can be determined to within about 10% when the energy consumption of a house is monitored for three days. However, the amount of solar radiation significantly affected the HHI of homes with a large south-glazing area, and wind speed similarly affected the HHI of homes with a high air infiltration rate. A comparison of the HHI with other indices currently in use shows that the HHI is the only consistent index when the average inside temperature of a building or its internal heat gain is varied. Most indices are flawed in that they do not take the efficiency of the heating system into consideration, or they put too much emphasis on the solar heat input. A calculation of HHI values for different types of passive solar homes from across the United States has shown that the HHI can be applied to these homes as an indicator of energy-efficiency, and that most of these homes are indeed energy-efficient.



Digital Repository @ Iowa State University,

Copyright Owner

Jonathan Daniel Huebner



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107 pages