OAR 918-440-0030: Energy Efficiency Rating (E.E.R.) System Single Family Residences

(1) Scope: These rules provide a voluntary energy efficiency rating system for single family residences to encourage voluntary energy conservation and the voluntary use in real estate transactions. (2) Definitions: (a) "E.E.R." means Energy Efficiency Rating; (b) "Single Family Residence" means a structure designed as a residence for one family and sharing no common wall with another residence of any type. (3) Energy Efficiency Rating: The Energy Efficiency Rating (E.E.R.) is to be determined by the following steps: (a) Determine the total energy used in the residence over the last 12 months' period in thousands of BTUs: (A) Determine electrical energy (KWH) used (source: Electrical bills or utility company). Multiply the total KWH by 3413 BTUs equals the total electric BTUs used. (Electric KWH) x 3413 = BTUs; (B) Determine natural gas therms used (source: Gas bills or the gas company). Multiply the therms used by 100,000 then by 0.75 (Efficiency Factor). This equals the total gas BTUs used. (Gas therm) x 100,000 x 0.75 = BTUs; (C) Determine heating oil BTU'S by multiplying total gallons by 140,000 then by 0.75 (Efficiency Factor). This equals the total oil BTUs used. (Oil Gallons) x 140,000 x 0.75 = BTUs; (D) Total the types of energy BTUs used in the residence to determine total BTUs used in the 12 months. (Electrical BTUs + Gas BTUs = Oil BTUs = TOTAL BTUs.); (E) Divide total BTU'S by one thousand equals total thousand's BTUs used TOTAL BTUs 1,000 = TOTAL THOUSAND BTUs USED (b) Determine the square footage of living (heated) space of the residence. (Source: House plans, measurement, or county assessor.); (c) Divide total thousand BTUs used by the square footage of living space. The results are the E.E.R. of the residence that year: TOTAL THOUSAND BTUs USED TOTAL SQUARE FEET LIVING SPACE = E.E.R.