Pull the last twelve months of electricity and gas statements, recording cost, usage, billing days, and average daily consumption. Note unusual events like vacations or heatwaves. If possible, add local degree‑day data, occupancy changes, and major appliance purchases to anchor comparisons and reveal seasonal patterns clearly.
Scan for rooms and routines that drive usage: extended HVAC runtimes, always‑on electronics, garage freezers, or space heaters. Compare weekdays to weekends, and mornings to evenings. Mark suspected culprits on a floor plan, so your walkthrough follows a purposeful route and uncovers the biggest opportunities first.
Block an hour, grab a notepad, sticky flags, an incense stick or thin tissue for draft detection, a tape measure, and a phone for photos. Invite another household member to help test switches and doors, speed data collection, and keep the process enjoyable and thorough.
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