Only the old timers know. The government and the industry are pushing for higher and higher efficiencies. The problem is that the higher the efficiency the less moisture removal.
Last year they were pushing 12 SEER. This year they are pushing 13 Seer and above. Every time the SEER is increased the system loses some more of its ability to remove moisture from the air per hour.
Three years ago I installed a 12 SEER system and immediately noticed that my house did not feel as comfortable at 78 as my 20 year old system,probably a 6 or 8 SEER. An air conditioner not only cools the air it removes moisture, and if the system removes less moisture per hour you will feel less comfortable.
So, only the old timers know that the higher SEERS suck. The newbees (less than 25 years experience)will say that if the system is design right you will not have any problem, with less moisture removable, bull.
The SEER on ac systems is like the cars and gas. They keep pushing the envelope for more and more out of these products, and they get more and more BUT AT A PRICE. The price for air conditioning systems and high efficiencies is less moisture removal per hour and less comfort in the home.
Here is one way to correct for the moisture problem. On my old system I used to keep it at 78F to feel comfortable. On my 12 SEER system I have to keep it at 74 defrees F to get the same comfort feeling. This is a law of thermodynamics and not a manufacturers design problem. So the lower moisture problem on the high SEER units in not due to any specific manufacturer. Every manufacturer will say there systems compensate for the problem. The manufacturers probably will not even consider it a problem.
Many of my customers have complained about the uncomfortable feeling with the new system. When I tell them to low the temperature 2 to 4 degrees colder, I never hear from them again. And the ones I do say that they feel more comfortable.
There are those who will say "did you do a heat load calculation, DO you have an engineer design it. Did you do this, did you do that. From my experience 99.99 % of my customers are happy making there home 2 to 4 degrees colder to compensawte for less moisture removal due to high efficience systems.
I have also experienced this solution (going colder on stat)
with many customers of other companies.
Don't make you Air conditioning system installation a nighmare. Many times something simple will solve the problem, but if you get the wrong people involved in solving your problem, you'll have a hellish nigh mare.
One company came out to a home of a 2 year old system and talked the home owners into a new system. They told the customer they had the wrong system, a lie. They said the system was not designed proberly, a lie. They put a system 20% two large in. The customer was so desperate that they had the 2 yeard old system pulled and a new one put in. The problem was worse with the new system. It was the AC from hell. It was two large for the home. The home always felt damp and muckie. It chilled ya to the bone. Very, very cold and damp.
well, good luck.