I'm not sure what "rear heater" you're asking about.
There are some trailers that have a rear rooftop air conditioner/heat pump. It's normally tied into the In-Command system (on newer trailers) and is controlled by that system. On older trailers it can be connected to a separate thermostat or controlled by temperature sensors located throughout the trailer and controlled by a central thermostat.
The "other system" is a "heat strip" installed in the rooftop air conditioner. That system has a small "1500 watt loop heater" mounted in the return air box (in the ceiling). As you can imagine, "sucking cool air into the rooftop air conditioner and supplementing that by adding 4500 BTU's of heat that's subsequently "cooled" as it passes through the rooftop unit, along the ceiling ductwork and into the trailer using "fast moving air" is not a very efficient way to "heat the trailer"...
Essentially, if you have a "heat pump" you'll feel warm air at the ceiling registers, if you have a "heat strip" mounted inside your rear air conditioner, you probably won't feel any temperature difference at the registers.
Finally, for me, the "add on heat strip" is woefully inadequate to provide "noticeable heat" to any RV. It can make a difference on "cool evenings" but simply can't produce enough heat to keep the RV comfortable in "cold" temperatures.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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