Travis Jordan wrote:
Travis Jordan wrote:
Harry K wrote:
Same here. Even if there is water standing there, it only
accumulates while the compressor is running so the total picked up
by full on fan will still be the same as in "auto".

http://www.fsec.ucf.edu/bldg/pubs/dp_air/Abstract.pdf

For the full article:
http://www.fsec.ucf.edu/bldg/pubs/pf118/index.htm

Conclusions
The above discussion and experimental results lead to one major
conclusion. For better dehumidification and reduced fluctuations in the
indoor humidity, cycle compressor and fan together in unitary
air-conditioning systems. To increase air movement for thermal comfort,
use local ceiling or paddle fans. Also, the air conditioner
dehumidification fraction in the field is lower than what is expected
from steady-state tests due to compressor cycling.

It can also be concluded that certain duty-cycling devices, which cycle
the compressor off and let the fan operate in order to pick up cooling
from the thermal inertia of the cooling coil, would raise indoor
humidity. While it is not contested that letting the fan operate will
extract the stored cooling in the coil, it will be at the expense of
increased indoor humidity.



I would not leave the blower on for these reasons:

1 - It uses a significant amount of energy, generates heat and doesn't
do a whole lot. A couple ceiling fans use far less power and do a lot
more

2 - If the air handler and/or ducting pass through areas like a hot
attic, you are going to have significant cooling loss.


As for the humidity argument, it's hard to imagine that a unit with a
proper drain is going to have enough water left in it after the
compressor shuts off to worry about.