I would increase the CFM (VFD) to it's highest setting. The will force the unit to work on more air thus causing the supply temp to be higher. This should reduce sweating.
The biggest concern with low temp air distribution is insulating the ductwork properly to prevent condensation. Even specifing non permeable insulation will not garantee that the installer will fit and seal it right. In todays low bid competitive market the workmanship associated with the many...
15 Hp pump? The actual water hp is probably in the range of 10 to 12 (assuming the pump is powered thru the curve). At this hp it is not worth time or energy to convert to VFD. The amount of saving will probably be minor, the potential for new problems to arise (the hydra effect) are more...
Generally when a pump is ordered it is powered thru it's curve meaning that for the impellor size no matter what the pressure or flow (since they are related) the pump will not overload. Increasing the hp without changing the impellor will not do anything. If you change the impellor more than...
