Good Sam Club Open Roads Forum: Does closing most A/C vents create back-pressure?
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 > Does closing most A/C vents create back-pressure?

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way2roll

Wilmington NC

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Posted: 07/16/21 06:27am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Dick_B wrote:

Just slightly off topic but too large an A/C can cool off the air without reducing the humidity which leaves one cold and clammy.


Which can be solved by running an electric heater.


Are you suggesting running a heater and the AC at the same time?


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profdant139

Southern California

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Posted: 07/18/21 09:48am Link  |  Quote  |  Print  |  Notify Moderator

Lots of helpful comments -- thanks! Although we do live in southern Calif, we live in the semi-humid part -- a few miles from the coast. (Can't afford a house on the beach!) But the a/c does reduce the humidity -- it puts out plenty of condensation that drips off the roof.

It is true that this a/c unit has no ducts -- it just has several small vents that can be opened or closed.

We could put up a baffle, but I am baffled about how to do that without destroying our already-limited headroom -- I am 6'3" and can't stand up under the a/c unit, although I can stand up in other parts of the trailer.

We tried the solution of closing most of the vents a couple of times, running the a/c for about 90 minutes at a stretch, during the hottest part of the afternoon. As far as I can tell, we did not experience any icing. We haven't tried running it during the whole night -- the temps where we live get down to about 70 at night, so we just leave the windows open.

Thanks again for all of your collective wisdom!


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01tundra

Middle, TN

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Posted: 07/22/21 07:27am Link  |  Quote  |  Print  |  Notify Moderator

If you close too many vents you restrict airflow across the evaporator coil.

If you restrict air flow across the evaporator coil the evaporator coil will start to freeze up.

If you freeze up your evaporator coil you run the risk of slugging the compressor with liquid refrigerant because it doesn't have a chance to flash to a gas in the evaporator.

If you slug the compressor you run the risk of it failing.

Now your too high of airflow problem is fixed because you no longer have an operating AC unit.


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