My first thought is that the air conditioner should be up high. Cold air falls and warm air rises. If you put the unit low, you'll have a hard time cooling the warm air up high.
SC,
Good Call! I was just explaining this to my way more intelligent wife then I and she said the A/C unit should go up high because cold air is heavier and will travel down. Hot air goes up...Duh!
Thanks for the information. 😎