Dometic Thermostat accuracy?

The accuracy of your system is 5 degrees Plus or Minus per Dometic. There is NO adjustment anybody can make. The problem is the OEM. They mount the remote sensors in places that do not reflect true accurate temps. Another problem is when you have Roof Heat Pumps. The system must be installed where the Hot/Cold air coming down from the roof can sense the cabin temp and also the Hot air from the furnace that comes from the bottom up to sense the cabin air temp. They try to get a medium, but usually fail. The temp sensors are just small bulbs on a wire. Remove the sensor cover and remove the plastic wire clamp if Monaco installed it. Hang the probe outside the cover and see if it is more accurate. That plastic wire clamp if pushing on the temp sensor end can cause false readings. Do NOT install that plastic wire loom clamp, but make sure you do bot allow the temp probe to fall into the wall. Monaco used to install the front remote sensor by the front overhead CRT TV and by the back side of the drivers chair overhead compartment. Both of those locations were "Hot" areas due to the TV and the front windshield and caused temp control problems. Monaco allowed us to relocate under warranty if that was the case. You can also buy 2 new remote sensors and install them in the roof a few feet from the AC control area. You run the wire down the overhead duct and then out and mount on the ceiling between the exhaust grills. Both Tiffin and Fleetwood mount theirs in this location. Doug