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Plasma TVs operate through the action of gases under pressure. Usually, they are calibrated to operate best at sea level and manage fine at most altitudes. If you live at a high altitude (7500 feet or above), you may notice some issues including increased noise and power consumption as the gas in side your plasma TV comes under more pressure.
For most people, this shouldn't be an issue. If you're concerned about it, consider buying a NEC television, which is rated to operate normally at up to 9,180 feet.