Lifecycle economics

Compare the project cost over 5 and 10 years.

Put installation, confirmed incentives, financing, energy, maintenance and expected repairs on the same timeline for two competing systems.

Scenario discipline

Keep assumptions visible.

A lifecycle result is only as useful as the inputs behind it.

Include equipment, labor, permits, electrical work and commissioning.

Use total scheduled repayment, not only the monthly payment.

Use the same weather, comfort and fuel-price assumptions for both systems.

Run conservative and optimistic cases for repairs, escalation and savings.