I have used a formula from an earlier discussion to count the number of
unique number appearing between E2:E1000.
=SUMPRODUCT((E2:E1000<"")/COUNTIF(E2:E1000,E2:E1000&""))
Column E being house numbers.

I would now like to count how many entries between A2:A1000 =1.
Column A is the number of days a repair is outstanding.

The result would show the number of houses that had repairs outstanding.
Each house can have a number of repairs each with a different number of days
outstanding.

Can anyone help me with this please?

Many thanks.