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Did they check your static pressure?
If so then post the numbers and you may get some insight to the howling noise as well as other potential issues.
Key1

Not sure if this has been mentioned...but if it were me, I'd ask them to check my ESP (external static pressure) when they are done. That info will provide you quite a bit of insight on your install...

Apparently the few days I was in New Orleans, the summer vanished in NJ. It is currently 63F out and the forseeable future has lows in the upper 40's at night and high's in the 70's during the day. ...

Good insights.
I am out of town a couple a days but will make some observations when I return...
Key1

I ran a test this evening. We had the windows open most of the day and closed them all just before sunset. About 8:30 PM the temp in the living room was 78F and the Humidity was 62%. I cut on...

OK??
Care to elaborate?

Key1

Did Robo mention how he keeps the plexiglas (if that is what he uses) from fogging up during operation so that he is able to see what is going on?

Key1

Consider it clarified. Beenthere is correct.
My dips are set for 350 CFM/ton and I am slowed to 80% for humidity control....which is 280 CFM/ton.
Key1

I am not clear on how I am outside of design parameters. I did not know there were parameters for the supply air temp other than don't let the coil freeze...that is why I asked if 41 is to low for...

My original plan was to bring it back to 320CFM/ton once we get through this spell of low heat load and high humidity (70F at night with 90+ percent humidity). However, it works so well this way,...

Not sure what you are saying that I should check from the statement quoted above....It appears to have been altered by the moderator.....but I assure you that the temperature measument is acurrate. ...

To reduce in-home Humidity from more than 65% to less than 45% (it worked) and to reduce static pressure from 1.2 to 0.57...

Key1

Thanks for the quick response...

the comfort R feature is not enabled. It seems to get cooler and cooler the longer it stays on and it bottoms out at 41F. It used to bottom out at 43F...then...

The supply temp inside the trunk duct about 3 feet after the coil sometimes drops as low as 41 degrees.

So far I have seen no indication of the E-coil freezing.

Some Background: In April 2008...

In a nut shell, (to save reading of dozens of old posts) My system was not sized properly or installed properly and I am uncertain if it was charged properly from the begining. For all I know the...

That's good to know. Thanks for the quick feedback

Key1

What about a drop from 400 cfm/ton down to 280CFM/ton for a 4 ton Trane XL15i??

The installers originally left me set up on 400 CFM/Ton but esp was ~1.2.

Now 1 year later....I run at 280CFM/ton...

What you may be calling an "AC" is the unit that sits outide. However the "AC" requires some way of distributing the cooled air throughout the house. That way is typically a blower (fan) and the...

I think 3 cph idealy would correspond to 10 minutes on and 10 minutes off. Which makes 1 cycle and takes 20 minutes to complete. Since 1 hour is 60 minutes.....3 of these "cycles could occur in 1...

I'm interested in the response you get on this topic as I have a 4 ton XL15i outside and a 5 ton E-coil inside. I was told the larger indoor coil increases the efficiency. As far as the AC being...

I have posted that site in the past and was scolded for doing so since it is a DIY dite........

P.S. you have no contact info in your profile....

Key1

I do not beleive you will be provided a simple answer.
In my case for example, a new 5-inch General-Air media filter Merv 10 has a pressure drop of 0.14 at about 1450 CFM in my system while a new...

you both will probally have to list your model numbers of your equipment and one of the knowledgeble people here that knows your brand will be able to tell you if it will work or not on your specific...

What type of Tstat do you have? Do you have one where the cycles per hour can be adjusted? My Tstat allows for a setting of 1 - 6 CPH for cooling. I have mine set on 1cph to maximize humidity...

I read the OP's total square footage as 3000......but I get your point on 6 tons of cooling.
Key1