What changes the price
- Equipment capacity and efficiency
- Ductwork or electrical changes
- Number of zones
- Climate and design load
- Refrigerant-line and permit work
Scope boundary for this calculator
This model isolates a heat-pump system as the project unit. The written proposal should identify system type, capacity, efficiency ratings, indoor and outdoor equipment, refrigerant-line work, controls, electrical changes, commissioning, and any backup heat. Duct replacement and envelope improvements are outside the default record unless a contractor lists them as separate scope.