There actually is a difference between commercial and consumer types of display screens.
Consumer lines (the models you'll find at Costco and on the other retail shelves) are only designed to run 4-6 hours per day.
Commercial lines (generally a bit more $) are designed for hospitality, board rooms and digital signage.
-designed to run more than 6 hours continuous.
-more fans with increased ventilation on the units.
-engineered to handle high stress environments.
-has button lock out and other public display type features.
Plasma screens are best if they can have 3 hours cool down each day, LCD's can run 24 hours but their price tag over the 42" size goes up significantly. Thankfully they are coming down quickly.
Commercial VERSUS Consumer types of display screens