I need to retrieve data by a group based on a value within the group.

Hello, 

I need to develop a query that retrieves the data of a group based on one of the values in the group. I am grouping by "Run ID", within the "Run ID" group there is a "Temp" value. I need the entire "Run ID" group that has temps >800 and groups with temps < 300. Is there a way to say retrieve all the data points in the "Run ID"s that have temps > 800 and/or <300? Thank you for any help.