New split AC System impact on sound.

@ghdprentice

I’ve had a basic one stage AC since 1992, tempstar, and I’ve had no maintenance except to change out a few fuses which I did myself, no annual visits for fear freon would gradually be released. Capacitors never been changed out. Only thing I’ve done is to change out the filters which are exceptionally important to not interfere with airflow as a clogged filter could lead to freezing of coils which could lead to the death of a system via leaks, etc.

10 years ago I added 3 pounds of Freon and since then everything has cooled really well but after a lot of cycling last year cooling robustness has diminished and at this point decided to replace it I think outcome of selling the house Will improve with a new AC otherwise I’d have a mark down to the closing cost.

In today’s world all the systems have a db rating. 
While not a heat pump last summer a new Trane (air conditioner/furnace) hvac system was installed. The a/c unit sits right below a large window on the rear of the house. No clue when it is running. 

OP,

That is great. Congratulations on such a great long run. We sold our last house with an ancient heat pump.

You are in for a treat. The new heat pumps are unbelievably quiet and efficient in comparison to older technology. Out exterior unit is right off our porch... as in I could drop something on it from my porch. Generally I can’t hear it in lower cooling modes... we can talk easily at full on. Now the neighbor’s unit is about thirty years old and on the other side of the wood fence thirty five feet away and that is MUCH noisier.

Not sure how it works, but if memory serves, a slightly warmer coolant means more dehumidification.  The problem with very cold AC is it cools quickly without removing humidity.  I think.

I'll leave this to actual experts. :) 

But this is why they recommend you do not oversize your AC unit/heat pump. 

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. It’s the cycling on and off that wears it out faster. I believe the rule of thumb is one ton per 1000 square feet.