Should I amend my return?

Hello.  Last week I completed my taxes using turbo tax premier and then electronically filed my tax return.  In that return I received a residential energy credit of $70   That was for a low E energy efficient window that I had installed in my home last summer.  The cost of just the window was $700.00   When I entered the $700 in my tax return, turbo tax said I qualified for the residential energy credit equaling 10% of the cost of the window, which comes out to $70.    Where I messed up was I only included the cost of 1 window, when in fact I purchased two at a cost of $700 each.  Since I only entered one window in my return, does it make sense to amend my return to get that additional $70 credit?  I've never amened a return and if I have to pay another e-file fee or other fee's, it doesn't seem like it would be worth the trouble.  Your thoughts?   How should I handle this or should I just forget about it?  Thank you in advance for your help.