Can i deduct the cost of replacing a well pump for geothermal heat system

Yes, you can !  In TurboTax Premier online program, here are the steps:

1.  Open (continue) your return in TurboTax.

2.  In the search box, search for energy improvements. (Don't search for "energy credit," as this will take you to the wrong        place in the program.)

3.  Click the "Jump to" link in the search results.

4.  On screen, Energy-Saving Home Improvements, answer Yes to the question and select Continue.

5.  Follow the on-screen instructions. 

6.  On screen, Energy-Saving Improvements for Your Home, answer No to question, Were any of these                                  improvements related to the construction of your main home?

7.  Skip through a few screens

8.  Stop at this screen, Enter Any Additional Energy-Efficient Improvements, enter information                                                  under Geothermal heat pump property

I hope the information is helpful !!