"Rich" wrote in message
g.com...

"TURTLE" wrote in message
...

"RJ" wrote in message
...

I live in an air-conditioned mobile home.

There are no return ducts.
Air is returned to the furnace in the utility room.

Some rooms are quite cooler than others,
so I've closed the outlets in those rooms.

Friends tell me that if you close the outlet ducts,
theres a chance of freezing up the cooler coils.

Possible ??

Any rule-of-thumb for measuring/avoiding this ?


rj

This is Turtle.

Years ago there was 2 rules of thumb about closing vents.

1] don't do it.

2] Never close more than 1/3 the volume of air off or 1/3 of the number
of vents in your home.

TURTLE


I could never understand this, when you close off unused rooms aren't you
lessening the load on the system over all? In heating and
air-conditioning? Or is it worse for one verses the other??

Thanks, Rich


You unblance the air flow that was designed into the ductwork.
Now, that said, mobile home units are different animals.
What the OP needs to do, since the air handler that is in the unit is made
to operate on a higher static, is to start with the ducts closest to the air
handler, and almost close them, not fully, but almost. As he gets farther
from the unit, (air handler) the ducts should be progressivly open till the
registers at the farthest end, are open all the way. Air, being fluid, goes
for the path of least resistance, and this will insure max air flow to the
farther ends of the home, while still allowing for cooling and heating to
take place.