Use WattMizan as a starting point.

WattMizan disclaimer

WattMizan provides preliminary, automated estimates for screening purposes only. It is not a professional energy audit, engineering assessment, or financial advice, and it does not inspect your premises or equipment.

Estimates are based on simplified assumptions and will differ from actual results. You are responsible for verifying all figures and for engaging qualified, licensed professionals before making any purchase, installation, or modification.

WattMizan is provided “as is,” without warranty of any kind. To the maximum extent permitted by law, the operator accepts no liability for any loss or damage arising from use of this tool.

Safety

Do not open, wire, repair, or modify electrical panels, circuits, gas equipment, or refrigerant systems yourself. Use a qualified, licensed electrician or technician for this work.

Privacy

WattMizan does not require an account and does not store the details you enter. Please do not enter personal information, customer data, utility account numbers, or anything confidential.