A project team needs to recommend an HVAC system to the owner. Which of the following options is the best investment over the lifetime of the HVAC system:

Question $11$ options:

The system that costs $$10,000,$ has a payback of $20$ years, has a life expectancy of $10$ years, and will cost $$20,000$ in maintenance over its lifetime.

The system that costs $$15,000,$ has a payback of $10$ years, a life expectancy of $14$ years, and will cost $$17,000$ in maintenance over its lifetime.

The system that costs $$30,000,$ has a payback of $2$ years, a life expectancy of $35$ years, and will cost $$10,000$ in maintenance over its lifetime.

The system that costs $$50,000,$ has a payback of $15$ years, a life expectancy of $20$ years, and will cost $$20,000$ in maintenance over its lifetime.