I just got a new furnace in my 800 sq. ft apartment. Single stage 80% efficiency 40K BTU Coleman. It seems much louder than my old one. The burners and the blower. And when I walk past the (single) air intake in the front room (which happens to be at head level), it seems to kind of hurt my eardrums/put pressure on my head somehow, when it's on. There is definitely a lot blowing relative to the old one. After a few minutes of it blowing, however, the "air pressure" sensation in my head goes away. Odd.
The single air intake is basically a couple of feet above the furnace itself, at head level.
A few other random clues: it sends air "down" into the ducts under the foundation, however it seems to leak from the edges of the unit and blow hot air "into" the utility closet. Also makes a ticking noise and seems to shake wall when blower on (shake it a tiny bit).
I'm also afraid of it being so loud people will have to turn the TV up and down for it. Most of the sound seems to be coming from "air" noise/volume/pressure.
Any ideas (either on air pressure or noise)? Larger intake (current is 14x20)?) Would a larger intake allow for better "heat rise" [temperature differential] across the heat exchanger?