Replies

1. 
   Frank R|May 31, 2011 09:56pm|#1

   I would not call small duct - high velocity systems green. By thier nature they have a high pressure drop which uses more fan energy for the same cooling effect. The "dehumidification" they refer to is because there is less airflow across the cooling coil. A standard air conditioner would get the same effect by reducing air flow across the coil by slowing the fan down (thus saving more energy).

   As for air leakage, I don't buy that thier systems have less air leakage. Properly installed ductwork will have low air leakage, improperly installed ductwork will have high leakge. If small ductwork/high velocity fiberglass ductwork is installed improperly, it will have air leakage problems. These systems can have thier uses, but a energy effecient house is not one of them.

2. 
   Bob Coleman|Jun 01, 2011 01:36am|#2

   i'm guessing their claim on less air leakage is because they sell a package system with sealed hoses which do probably tend to leak less than a typically installed system. they pretty much only can leak at the unit connection and outlet connection if they don't use trunks.

   the only more 'green' feature is that you may be able to run all the ducting inside the envelope because it is so small whereas traditionally many homes run in in an unconditioned attic or basement.

   you could probably hit better effeciency with a better a/c condenser which is seperate from the blower, depending on which company you go with and what they install, but the high speed blower will use more juice and not help matters