Home & InteriorsSomeone trying to cut a home’s energy costs

When everything promises savings, I want to know which actually pays back, so I do not sink a large sum into something that takes twenty years to break even.

Khi mọi giải pháp đều hứa tiết kiệm, tôi muốn biết cái nào thật sự hoàn vốn, để không bỏ một khoản lớn vào thứ mất hai mươi năm mới hoà.

Job context

Who
An owner weighing an energy investment
When
Before deciding
Trigger
Three quotations promising three different savings
Situation
Whoever computes the saving is selling the solution
Constraints
The investment is large and irreversible

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