Originally Posted by msimonelli
Purchased a 2016 Vibe 322QBH in January at the show in Edison, N.J. First trip out in April (local campground in N.J.) the thermostat for the heater was set a 70 degrees overnight. Master bedroom was very warm (sweating) but the rear bunkhouse was a good 15 degrees cooler. Currently having the unit looked at for a blockage or kink in the duct. Service tech mentioned that it is not uncommon for the rear of the trailer to be cooler since the heater is located at the front of the trailer. (?) Anyone experience similar issues? This is my third trailer, but the first time I've had a situation like this. Thanks in advance.
When a forced-air heating system provides over-all sufficient heat but does not keep all spaces at desired temperature, the problem is generally unbalanced distribution of the forced air - the overheated space gets too much and the thermostat satisfies before the underheated space warm sufficiently. Your home has registers and/or dampers that allow the HVAC contractor to adjust the air flow room-by-room to overcome this problem. RVs generally do not, and no attempt is made by manufacturer's to balance airflow.
The position of the actual furnace is of no concern and your service tech is obviously HVAC system design illiterate.
Next time you use the system try blocking off some of the master bedroom's supply air grill. Just tape a piece of paper or thin plastic (think side of milk jug) over part of the supply grill. Through a little trial-and-error, you should reach a happy point where both the master bedroom and the bunkhouse heat up equally. Once you've found the happy point, unscrew the grill, move the block to the underside, and replace the grill.
Side point - blocking grills reduces the air flowing not only through THAT grill, but reduces the total air flowing through the furnace (the duct pressure increases and the volume of air flowing in the total system decreases). If you block too much, the furnace can start "cycling" on its high temperature limit.
Another thing to keep in mind, for even temperature control, every supply-air grill must have a clear, unobstructed path for air to flow from the supply grill to the return grill.
A hint to RV manufacturers - use supply air registers vice supply air grills, and if your design people do not know the difference get them trained.
Alfa Delta Two Eight