What is the preferred method for measuring energy consumption in the HERS rating?

The preferred method for measuring energy consumption in the HERS rating is based on RESNET standards for energy audits. This method is highly structured and relies on established protocols that ensure accuracy and consistency in energy measurement. RESNET (Residential Energy Services Network) provides guidelines that detail how to conduct energy audits, which include specific procedures for analyzing a home's energy features and performance.

Using RESNET standards allows for a comprehensive assessment that captures different energy usage characteristics, integrating data on heating, cooling, appliances, and lighting. This systematic approach provides a reliable basis for calculating energy consumption and generating HERS ratings, which ultimately assist homeowners and builders in making informed decisions about energy efficiency improvements. The thoroughness of this method strengthens its credibility and utility in various settings, including real estate transactions and energy efficiency programs.

In contrast, relying on self-reported homeowner surveys can lead to inaccuracies due to subjective interpretation and potential biases. Historical energy bills from utilities can provide useful context but may not represent current energy consumption accurately due to changes in lifestyle or property conditions. Visual inspections conducted by untrained personnel lack the precision and expertise needed for effective energy assessments. Therefore, the RESNET standards represent the most reliable and accepted approach for measuring energy consumption in the context of HERS ratings.