return setof and Temp tables

I have looked around and found that you can use return setof in a
function to return a result set, but can you use a temp table as the
setof target? I build a temp table using various select statements and
then try to return the result as a recordset. I get an error: type t1
does not exist.

If this is not possible, is there some alternative way to do this? I am
trying to translate what was done in a ms sql database.

Justin