What are the primary factors that should be considered when performing a home energy audit?

The selection highlights the importance of a comprehensive approach to understanding a home's energy performance. When performing a home energy audit, air leakage is a critical factor because it directly affects how efficiently a home maintains its desired temperature, impacting heating and cooling costs. Identifying areas where air can leak in or out helps in implementing measures to enhance energy efficiency.

Examining mechanical systems is also essential since these systems, which include HVAC (heating, ventilation, and air conditioning) units, contribute significantly to a home's energy consumption. An audit should assess their efficiency, maintenance needs, and the potential for upgrades or replacements.

Moreover, occupant behavior is a vital aspect to consider. The way residents use energy influences overall consumption patterns. For instance, if occupants leave windows open while heating or cooling their homes, it can lead to increased energy use that might not be addressed by improving insulation or updating mechanical systems alone.

Considering insulation levels and occupancy type, the size of the building, or only focusing on mechanical systems alone would not provide a comprehensive view of the factors affecting energy performance. Addressing air leakage, mechanical systems, and occupant behavior collectively offers a more holistic understanding and leads to more effective solutions for improving home energy efficiency.