Yes, potatoes stored in an air-conditioned room at 75°F should last for two weeks without any major issues, but there are a few things to consider:

1. Temperature: Potatoes store best at cooler temperatures, ideally between 45°F and 55°F. While 75°F is warmer than ideal, it’s still acceptable for short-term storage like your two-week period.
2. Air Circulation: Make sure the sacks are in a well-ventilated area, as lack of airflow can lead to moisture buildup, which could cause sprouting or rotting.
3. Light Exposure: Keep the potatoes in the dark, as exposure to light can cause them to turn green.
4. Inspect the Sacks: Regularly check the potatoes for any signs of spoilage or sprouting. Any potatoes showing issues should be removed.

For two weeks, your 50 lb sacks should be fine, especially if you keep an eye on them. If you notice them softening or sprouting, you may want to use them sooner or adjust the storage conditions.