Most apartment buildings with HVAC have shared air intake and shared exhaust vents. So if my neighbor is running his A/C then he is actively exhausting hot air from his place which travels through the exhaust vents, some of it gets exhausted out the building and some of it gets recirculated. But the exhaust vents are shared, so if I’m not running my A/C then some of his hot air can end up in my place. In practice, is this a measurable effect?
In: Technology
If your neighbors, especially the one below you, are running their AC it should help **reduce** the heat coming into your apartment.
If they’re keeping their place colder than you then heat is flowing out of the walls into your neighbors places, and you’re only gaining heat from the exterior face.
As u/tdscanuck says, the AC hat exchange is normally on the roof, none of the heat from their units should affect you at all.
Latest Answers