Image 1: Different layers of a wall (Source: SCEP) 

Asset Score Report Recommendation:  Add Wall Insulation

Cost: $$ to $$$ (based on the difficulty of adding insulation to the existing wall)

Heat naturally migrates from warmer to cooler areas. During winter, heat travels through exterior walls to the outdoors, while in summer, it moves from the outdoors through exterior walls into the building. Incorporating insulation into exterior walls reduces the workload on the HVAC system, enhancing interior comfort. If a building lacks wall insulation, adding it will optimize potential energy savings.

Choosing the right wall insulation to enhance performance relies on several factors, such as the wall construction material, existing insulation, and available space. Tailoring insulation options to the specific conditions of the walls is key. If your walls have open spaces, like wood or steel frame structures, blown-in insulation is a great choice to fill those gaps. For other walls, like masonry or metal panel, you can explore options for interior or even exterior surface insulation.

Interior choices include fiberglass, reflective bubble pack, or foam with varying thickness. Determining the best amount of insulation for cost-effectiveness is heavily influenced by factors like the building's location (climate zone) and energy prices. When upgrading wall insulation, it's crucial to also address methods to minimize air leaks through the walls and around windows, ensuring you get the most out of your energy savings.

This measure involves adding insulation (increasing the R-value) for the exterior walls. 

Resources:

1. https://www.energy.gov/energysaver/adding-insulation-existing-home