Does the additional static pressure caused by the hot water coil add an operating energy penalty?
It might. However, the static pressure across the coil is only .05 inch, and the use of the variable speed drives makes the system fan power most likely significantly less than the system it is being compared against. The slight energy penalty that might be due to the .05-inch static pressure pales in comparison to the energy saved by not running the compressor in the heating mode.
