There is no other way to put it – The thermostat that comes with most campers absolutely suck. If you have ever camped in the cold, you know how
difficult impossible it is to get the furnace to an accurate and tolerable temperature.
The good news is, that this is a simple five minute project to fix. All you need is a two-wire (ideally heater-only) thermostat. I bought mine, an Emerson 1E78-140, from Amazon for about $20.
1. Turn off or disconnect your battery.
Now you have a better, smarter thermostat to run your furnace and so you can see the interior temperature at anytime.
A word of caution with a digital thermostat; it only works if the batteries are good. So if you are camping in the cold, remember to bring spare batteries for the thermostat. I also keep the old thermostat in my “spare parts” box, just in case.