Patent ID: 7636666

Claim:
A method for generating a home energy efficiency label comprising: measuring, in real-time, said gas-energy usage of a household, said measuring comprising metering of normal volume constituting displacement of molar content per unit time by application of a gas meter compensated for temperature and pressure variations in natural gas flow; obtaining, in real time, outside temperature data by at least one of: obtaining outside temperature data from the Internet or by using a temperature measurement device outside of the household; receiving by a household computer said real-time measurements of gas-energy usage and temperature data; displaying said received data on a household computer screen; correlating, in real-time, by said computer the received gas-energy usage to the received outside temperature data by applying statistical analysis, said correlating comprising: antecedent (a) calculating a ratio HEET0 of change in gas-energy usage to change in outside temperature about a fixed reference temperature TO characteristic for cold weather when heating is required by the following formula: HEE T 0=[ y ( T 0+Δ T,{Ti })− y ( T 0−Δ T,{Ti })]/(2Δ T ), where ΔT is a temperature difference and y(T,{Ti}) denotes an approximation curve that is a closest fit to the received data on gas energy usage versus the received data {Ti} on outside temperature T by statistical analysis; (b) calculating the mean of ratio (a) over reference temperature TO given by the received outside temperature over a time period, wherein (a) expresses the degree to which gas-energy usage in heating is influenced by cold weather and (b) expresses the degree to which gas-energy usage is influenced by the most recent weather pattern; displaying the results of (a) and (b) on said household computer screen simultaneously with time history of said real-time gas-energy usage and outside temperature both for the same period of time, wherein said period of time is selected from a few minutes to a few years, generating, by a computer, the home energy efficiency label comprising in one graph said approximation curve and said received data on enemy usage and outside temperatures, and the results of (a) and (b); using the label to certify home energy efficiency on a housing market including home appraising and financing.