This is a my respond to Shaun's thread http://www.hvac-talk.com/vbb/showthr...threadid=89347 Didn't see a reply button.
I think your installer has it backwards.. in my opnion..
For basements, returns should be near the floor.. You would want to draw the cold air off the basment floor.. Cold air is heavy..
as main floor, I like most of them high, and one larger one near the floor.
With the higher return, it will pull the warm iar from the ceiling.. I see it helps recycles the warm air near the ceiling. and also helps pull away the heat in the summer.