Soundproofing a HVAC closet

Agree, some of the higher end stuff does come with a matching price and if it works as advertised, I'm okay with it. Looking for a 4X4 section rather than a roll. I'll take a look. Thanks.

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I did cover the inside of the door with Reflective Roll Insulation and foil tape. I also installed foam weather stripping around the door opening

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Actually, I did the same thing for the same reason you mentioned after the new unit was installed. The installers had pushed away the insulation blankets in the attic away from the unit and it didn't take long to notice the heat coming through the walls which in turn gave a false indication to the thermostat. Once I repositioned the blankets, the problem with the heat and the walls went back to normal.
Do you have any coverings at the bottom of your closet or is it bare slab?

This is also a Trane unit that replaced a Lennox. The 20 yr old Lennox was a whole lot quieter and I agree, the Trane moves a lot more air than I expected and a heck of a lot more efficient.
Sounds like we are driving on the same road trying to get to the same place.
Thanks for your input.

I have a new Trane unit that's in a second floor closet. The return is in the first floor dining room ceiling and if it's quiet in the house it's pretty noticeable. There used to be a filter there but now the filter is at the unit itself.

I've thought about using some type of weather stripping along the opening of the return just inside the grate to dampen sound but wasn't sure it would work.

What model do you have

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I wish there was a way to slow the fan speed down without sacrificing efficiency, but I don't think that is possible.

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You didn’t mention what type and size of air handler that you have but even the simplest units have a speed tap from the blower motor to the air handler control board to change the speed of the blower motor. For much of the country the speed is set at 400 cfm per ton in cooling mode (e.g. 4 ton unit would be set to deliver 1,600 cfm), so the units come with that setting, but in the deep humid south the blower motor speed can, and in many case should, be reduced to 350 cfm (1400 cfm for a 4 ton unit) or even a bit lower, to help better lower humidity, but the speed cannot be reduced so much that it causes the evaporator coil to freeze over from low air flow.

This might be best discussed with the HVAC tech who installed the system but all this information should be in the air handler manual, of which you should have been given a copy when the new unit was installed. As an aside, the blower motor often uses a slower speed when in heating mode (compared to cooling mode).

I really don’t know if this would help, at least to some degree, with noise reduction, I just wanted you to be aware it might be an viable option along with soundproofing.