Sumproduct(indirect(formula needed

[srizki]

I need an sumproduct(Indirect formula that will see the headings of columns (month) and go to that sheet and sum all values from a column, a column D, if it meets two criteria of column A and column B.
so for example on sheet one where the formula is,

I want to add up all the hours of technicians who worked on "PROJECT" (Column A Heading), WIND, and they worked on "WARRANTY", (column B) in the month of 'AUGUST", (first heading of columns C through N, 12 months).

Thanks​