Delete all rows from a temporary table except those meeting a selection criteria

I have a temporary table #SearchTbl in my procedure that is filled with data.  I have a SELECT statement that selects some of the data from #SearchTbl.  Instead of putting the selected data into a new table, how can I simply delete the rows that do not meet the select statement criteria?

Current method:

INSERT INTO #LoopTbl SELECT * FROM #SearchTbl WHERE Var1 = X AND Var2 > Y AND Var3 < Z

I'd rather end up with the selected data in the #SearchTbl (deleting the rest that was in the #SearchTbl), without having to use the #LoopTbl.  Is there a simple way to do this?

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Gina