How to Identify Under-Insulated Areas in Your HomeMany homeowners suspect their insulation could be better but aren’t sure where to start. Fortunately, there are several ways to identify under-insulated and air-leaky areas — ranging from simple DIY checks to professional energy audits — that can guide targeted improvements and deliver real cooling efficiency gains.The Do-It-Yourself InspectionCheck the attic first. Pull back any flooring or storage and measure the depth of existing insulation. Most older homes have 3–6 inches of insulation in the attic — far below the recommended 10–16 inches. If you can see the tops of the attic joists, you almost certainly need more insulation.Feel for drafts. On a hot day, hold your hand near electrical outlets on exterior walls, around window and door frames, and near baseboards. Warm air infiltrating through these areas indicates air leaks that need sealing.Check for uneven temperatures. If certain rooms are consistently hotter than others, poor wall insulation or leaky ducts serving those rooms are likely contributors.The Candle TestHold an unlit incense stick or a very thin candle flame near suspected leakage points. Movement of the smoke or flame indicates air movement — confirming a leak.Infrared Thermometers and CamerasAn infrared thermometer can reveal temperature differences on wall surfaces that indicate poor insulation or air infiltration. Professional-grade thermal imaging cameras take this further, producing visual maps of thermal anomalies across entire walls and ceilings. Many HVAC contractors and energy auditors offer thermal imaging as part of their services.The Professional Energy AuditA certified energy auditor uses a blower door test — a large fan mounted in an exterior door that depressurizes the home — combined with thermal imaging to locate and quantify all air leakage points. The resulting report provides a prioritized list of improvements with estimated energy savings for each. Many utilities offer subsidized or free energy audits; it’s worth checking with your local provider.Where to Focus FirstIf resources are limited, prioritize in this order: attic air sealing and insulation, duct sealing and insulation, window and door weatherstripping, and then wall insulation. This sequence delivers the greatest return on investment in hot climates.