Can 2 stage furnace be forced to stay in low?
The W2 wire in the thermostat controls the 2nd stage heating.  If you disconnect that wire at either end you should not get the 2nd stage.

By the way, you might also check to see if your furnace has a fan speed control.  The default setting, usually HIGH, may be too high for your installation.  I know that in my unit there is a rotary switch with labels "I", "II", "III", "IV", "V" that controls the blower fan.  I found that "V" sounds like a tornado but "IV" does the job.