New split AC System impact on sound.

the bosch heat pump can be set to become a 2 ton unit from a 3 ton and from a five to 4 ton via dip switch but I think there's some automatic features that automatically adjust capacity between the Compressor and the air handler. And the air handler comes with two speeds so it's not fixed so that's a good thing.  It seems it's a lot of simple things going on with a lot of fancy words they sprinkle on.  Like super cooling and suction and saturation points - my favorite is liquid slogging. 

When I initially sought out a replacement thought I could just get a one stage and call it a day but then temptation grows and you learn about this new stuff on the market and it sounds compelling.  Further if I enable the heating side of the heat pump it can be supportive to my existing heating system which might be ideal on those not so cold days but I don't get ventilation into my basement but still it's kind of a neat feature.  

I have the Mitsubishi HyperHeat HVAC and it is very quiet.  

https://www.mitsubishicomfort.com/products/heat-pumps

Paul McGowan of PS Audio complains about how loud his HVAC is....

https://www.psaudio.com/blogs/ask-paul/what-are-the-best-air-conditioners-for-music-rooms

Ron

@emergingsoul

Do yourself a favor and look into a Mitusubishi mini split system, I have one in my garage, when it is running you can not hear any noise coming from the inside unit or the outside unit. When I am outside with the system running there is virtually no noise coming from the unit when I am standing right next to it.

One benefit of variable speed systems is to address the very issue that you are concerned about, humidity. Those systems will run longer but, at a reduced (varying) capacity to have more time to wring moisture out of the air. I suggest that you put your contracter on the grill to get them to fully explain all of the pros and cons of these systems to help you make the best choice for you.

Yes indeed, oversizing an a/c system will result in reduced comfort meaning you will have cold but, damp air.

After 40 plus years in the a/c business I at least learned that the above is true. 

@tomaswv 

 The one thing I regret is not having insulators put between the compressor and the concrete pad on which it sits. 

You could still do this.