Aluminum strips alone may not be the best choice for constructing an energy-efficient wall. Aluminum is a good conductor of heat, which means it can transfer heat quickly and isn't ideal for insulation. However, aluminum can be used in combination with insulating materials to enhance energy efficiency. For instance, aluminum composite panels with a core of insulation material can provide both structural strength and thermal insulation. The key to energy-efficient walls is to use materials with high R-values (thermal resistance), such as fiberglass, cellulose, or polyurethane foam. These materials, when combined with aluminum in a composite panel, can create a wall system that is both durable and energy-efficient.