The analysis term is the number of years that are used in the calculations.  Some projects look better with a 5 year analysis term and others may be better with a 10 year analysis term.  

Change the analysis term in the Project Settings menu.
Change the default analysis term in your Profile. 

In the LightBids analysis, the proposed equipment can burn out too.  If your maintenance savings is negative, the proposed equipment is probably burning out.  Try using a shorter analysis term to see if the maintenance savings value improve. 

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