"bucholtz-gmail-com" wrote in message
oups.com...
Basics:

Have an oversized AC unit causing a humidity problem. I have been
given many suggestions for fixing, but would like feedback on the
different options.


Solutions:

After talking with different HVAC contractors about the problem, I have
been given three suggestions. Before throwing good money after bad, I
would like input on the validity of the suggested fixes. In addition,
if there are any other fixes that could work, please let me know.

Suggestion 1: Replace unit with proper sized unit

This solution is "the proper way" to fix the problem, and was how
it should have been handled in the first place. However, I am being
told that everything needs to be replaced, including ductwork to
account for differences in blower motor output of the smaller unit. I
have been told that the duct work pressures will be different and that
everything needs to be sized according to the system as a whole. Is
this true?

Since all our new drywall will need to be ripped up to install new duct
work, I would hate to have to go down this path.

Suggestion 2: Change size of compressor

Is this really an option??? One contractor said I could just put in a
lower rated compressor, but I am skeptical of this solution. I have
been reading other posts on the news group, and it sounds to me like
the blower will still be moving air at the same rate over the coils,
and that this may still leave my house humid since the moving air will
have less contact with the coils. Is this true?

Suggestion 3: Install central dehumidification

This seems logical; with the only issues being the unit will run less
efficiently since it would still short cycle, causing stress to
controls, motor, etc. Additionally, I will be paying electricity for a
dehumidifier to run on top of my AC. On the plus side, we will get
humidity control year round, even when too cool for AC. Are there any
other caveats to this approach?


Increase the size of the area being cooled to better match the system,
install a duct to the garage. The amount of energy you waste cooling the
garage may be less than the cost to correct the problem. Not ideal but
perhaps you have another uncooled space that is not a garage like an
enclosed porch. You can close off this area during heating season.

Opening a window would have a similar effect of enlarging the cooling load
but that is an obvious waste and least preferred but it may relieve some of
your humidity problems short term. Not all the way, just a crack.

Increase the cooling load in other ways: Cut down a shade tree, open some
curtains, install less efficient windows (not). have the kids leave the
door open too often. etc.