This calculator combines monthly utility spending, home size, climate adjustment, and insulation quality to estimate avoidable energy waste and realistic annual savings potential. It is designed for planning-level prioritization before detailed contractor proposals. Pair these estimates with our energy efficiency ROI calculator to evaluate project-level economics.

Planning Guidance

Many homeowners over-prioritize equipment replacement before fixing envelope issues. In most climates, the sequence of insulation and air sealing first, then controls, then mechanical upgrades yields better cost-performance and often reduces required equipment capacity.

• Use 12 months of utility data for better baseline accuracy
• Benchmark efficiency score before and after each project
• Prioritize envelope fixes before major HVAC replacements
• Re-check savings assumptions after occupancy or schedule changes
• Combine this audit with project-level ROI modeling before spending
• Validate estimates with a professional blower-door and duct test

Sources & References