What could this be in my friend’s house? The rental property listing mentioned only an evaporator and heat/AC duct system, but these holes are only present in the living area—nowhere else.

What could this be in my friend’s house? The rental property listing mentioned only an evaporator and heat/AC duct system, but these holes are only present in the living area—nowhere else.
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It sounds like those holes might be related to the HVAC system in your friend’s house. If the rental property mentioned an evaporator and duct system, the holes could be where the air vents or registers are located. These are necessary for conditioning the air to flow from the central unit into the living space.
If they are smaller than typical vents, they could also be access points for maintenance or cleaning. It’s a good idea to check if the vents are functional and ensure they are properly covered or fitted. If there’s still uncertainty, your friend might want to ask the landlord or property manager for clarification.