New split AC System impact on sound.

Forgot to address the power issues.  Major appliances plus seasonal variability cause your AC to fluctuate in ways a dedicated line won't solve.  I've been watching my incoming AC for at least a decade, in apartments, condos and now a detached home.  I'm also paranoid about surge damage.  For these two reasons I recommend the Furman units with built in voltage regulation like this 15A unit or this 20A unit.  I also have a mostly dedicated AC line, with the exception of an attached internet camera.  The voltage sags and variability are NOT caused by my gear but by my HVAC especially in the summer.   Worth shopping around as some pro stores sometimes run amazing sales.

I think the main problem with oversizing your AC/heat pump is if it’s bigger than the house requires, it cools your home too quickly and cycles on and off too much instead of running for a longer duration.

Right, and these short cooling cycles are not long enough to run enough air through the radiator that captures the moisture. I think. And yes to the long term wear and tear.

Trouble for me is that the size needed for my home has just changed over the past 5 years I've lived here.  My risk assessment has gone from primarily flood and water to heat and wind. 

I have a Trane Heat Pump, variable speed, for about 10 years now.  Whisper quiet, heats, cools and dries very well.

@emergingsoul 

A couple of years ago, I bought a Mitsubishi mini split for our  “TV room” and Mud room.  The outside unit is maybe five feet from my left speaker and the ceiling air mover is maybe ten feet away. Maybe because it’s only a one ton unit, it doesn’t affect anything. While I can sometimes hear the outside unit when it’s on, I can never hear the blower part and I do most of my listening at lower levels.

I recently had a 2 ton Bosch heat pump/propane furnace combo installed and it is much better at removing humidity over the previous furnace/ac combo. Quite superior for humidity.