Quote:
Originally Posted by Donks
Double checked with the dealer and both the ac layouts are accurate for the two in-stock units I am looking at.
Also have been having conversations on this subject and one person (who is anti-duct) said this about ducted ac in a 5er: Your ceiling does not have that much insulation around the duct work because, keep in mind, the space from ceiling to roof is only +/- 6 in at most. This causes the ducts to warm up in really hot weather increasing the temp of the air coming out of the ducts. Additionally, the further the chilled air has to travel from the unit through the duct to the vent, the warmer it is compared to the temp if it was being dumped straight out of the unit. Another point he had was that all the shifting and jolting around that occurs during travel time causes duct leaks in the ceiling making you lose cold air that way as well.
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In theory that sounds correct, but with 2 A/Cs that cooled air from each unit will not travel more than 1/2 the length of the rv, 25% in either direction of the A/C before mixing with air from the other unit. If there were only 1 A/C I could see the air warming when traveling the length of the rv through the ducts.
IMHO the direct dumps may cool down the rv quicker, but very loud especially at night, where as the ducted units are much quieter with more even cooling.
Plus I would suggest removing all the ceiling vents & tape, or retape, the gap between the outlets & the duct work to prevent any air lose into the attic. This is an issue in most ducted A/C systems on RVs. Also check under the A/C unit to confirm it's sealed between the outflow air & return air, the folks building these things get a bit stingy with the tape at times.