When to use the heat pump tool
The Heat pump tool is built for practical hvac and energy planning. It helps plan heat pump capacity, efficiency, backup heat, home size, and insulation effect, while keeping the calculation tied to the actual work rather than a generic remodel assumption.
It is most useful when the project is still being shaped: measurements are close but not final, product grades are not fully selected, and the homeowner wants a clearer brief before comparing suppliers, materials, service companies, or contractor quotes.