Hourly load research data for residential customers is used to calculate diversity factors and KWHR-to-peak-KW factors. The customers are grouped into two classes based on their type of heating. The class-based diversity factors are a function of the number of customers, month and type of day. The class-based KWHR-to-peak-KW factors are a function of the month and type of day. With the use of control samples, comparisons are made between estimated and measured peak KW. Estimated daily load profiles are also calculated and compared to measured daily load profiles.