I have contacted the heating and cooling contractor and he has installed some dampening material in the cold air return of the master bedroom. The noise level has been reduced by about 50%, but at times it still can keep one awake.
I want to make the following suggestions to the heating and cooling contractor.
1. Install a double vent, in the wall, in the hallway opposite the one in the master bedroom.
2. There is room to install double vent in one of the other bedrooms. No air rush noise in this bedroom.
3. In the other bedroom, where there is air rush noise, there is no room for a double vent, but I believe dampening material in the cold air return would be enough.
4. In the basement, in the cold air return duct, near the blower,install a cold air return vent to "bleed" off some of the air.
5. The most drastic action would be to block off the cold air return to the master bedroom and one of the other bed rooms, but I do not know what this would do to the air balance, but at least we could get some sleep.
I have programmed the thermostat to go to a lower temperature when we go to bed and hope to fall asleep before the blower comes on.
We live in Up State N.Y. and the heating season is longer than the so called cooling season.
I am open to any other suggestions. That's it.