The amount of the credit is shown below from the IRS instructions.
Nonbusiness Energy Property Credit
(Part II)
You may be able to take a credit equal to the sum of:
1. 10% of the amount paid or incurred for qualified energy
efficiency improvements installed during 2016, and
2. Any residential energy property costs paid or incurred in
2016.
However, this credit is limited as follows.
1. A total combined credit limit of $500 for all tax years after
2005.
A combined credit limit of $200 for windows for all tax years
after 2005.
2. A credit limit for residential energy property costs for 2016 of
$50 for any advanced main air circulating fan; $150 for any
qualified natural gas, propane, or oil furnace or hot water boiler;
and $300 for any item of energy efficient building property.
Part I consists of solar, wind, and geothermal units installed in your home. For more information you can use this hyperlink: IRS
Instructions - Energy Credit