Just had a new furnace/AC installed, and they extended the ducts to the
previously unAC'd addition.(Formerly heated by a wall furnace, now replaced
with a gaping hole on an interior wall.) New furnace is 93+, AC is 12 or 13
SEER. It has inline humidifier, but that is turned off. Went downstairs to
do laundry, and noticed a puddle under the low point of the duct run, about
4 feet from where it goes through the very expensive hole in the poured
foundation wall, into the crawl under the addition. Outside of duct is dry,
and the water appears to be coming from a joint in the new duct. It was hot
(90+) today, with high humidity, so this is the first real stress test for
the unit. The ducts in the crawl, to my dismay, are the 2-layer insulated
flex- furnace company said that is all they will install in uninsulated
crawls. There is an air return in floor right at the archway to the
addition, and that duct is dry. Crawl is dry, as far as I know, but walls
are not insulated, and there is no plastic on the dirt, and there are no
vent holes to play with. Hasn't rained in several days, and I don't get
ponding near foundation, so I'm pretty sure the dirt isn't the cause.
Anybody got any ideas?
Also, while I have your attention- Lots of pronounced air leaks from the box
around the A-frame in the furnace stack, around where the access holes for
the plastic plugs on the coil are. Is that normal? Should these holes be
covered with plugs or aluminum tape or something?
I plan on calling the furnace company Tuesday when they reopen, but I'd like
to not look like an idiot when I call....