HVAC at Walmart, direct fron dreck in Bentonville!
I'd heard our heat & a/c is controlled by our home office which explains why there are areas in my store than are dreadfully hot--the sweat pours right off of my while I work, among those complaining about the heat, to places painfully cold--such as the back of the store in the hallway where some of our lockers are...
Seems we might have similar equipment that you say are at Lowe's & Home Depot, and why there is that inconsistency, & the interior climate's unevenness...
(Well, need I say more? I can't think of much else, other than this, at the moment...)
-- Dave