Improving home energy efficiency often starts with insulation, since heat loss through poorly insulated walls, attics, and floors is one of the largest and most fixable contributors to high utility bills. An energy audit, either professional or a basic self-assessment using a thermal camera, identifies exactly where a home is losing the most energy, which prevents wasted spending on improvements that address a secondary issue rather than the primary one. Attic insulation typically offers the best return on investment, since heat rises and an under-insulated attic allows significant loss during cooler months and heat gain during warmer ones. Sealing air leaks around windows, doors, and utility penetrations is a comparatively inexpensive step that often gets overlooked in favour of larger insulation projects, despite delivering a meaningful efficiency improvement for a relatively small cost. For homes considering larger investments like solar panels, addressing insulation first is generally the smarter sequence, since a well-insulated home requires a smaller, less expensive solar system to meet the same energy needs.