This calculator estimates annual heating costs for various heating systems.

This calculator allows users to perform unlimited load calculations, with the option to purchase printable reports.

This website offers several free and purchasable load calculation tools.

This tool assists contractors in sizing heat pumps and will advise "Use Manual J" if the entered characteristics fall outside the recommended range.

This calculator estimates the annual and life cycle costs and savings associated with air source heat pumps.

This calculator tool prompts users for the necessary information to generate a general sizing estimate for mini split heat pump systems.

This calculator allows energy professionals—such as contractors, advisors, and analysts—to evaluate the economic and environmental effects of green home and transportation upgrades.