They have 2 thermometers to check the temp. One is this thing they swing around; I think that checks the room/hallway temp. They also have this laser pointer looking thing; they shoot it at the vents to check the temp of the air coming out.
When it's really hot in a room, it takes a while to start feeling a difference to me, but not a couple of days
. What does the air coming out of the vent feel like? If it were me, if I couldn't tell a difference by in the morning, I'd be calling them back.