I bought a small $9 heater at Walmart. It got so hot in the teardrop that the walls were sweating.
Hi,
Warmth from a heater doesn't make the walls sweat, moisture does.
Warm moist air contacts the cooler walls and ceilings, and it condenses (sweats).
It usually, in a teardrop, comes from the occupant (breathing).
It is important to vent the moisture out, even more important is to allow fresh air in, even when it is cold outside.
Most of us crack the top vent and another window just a little.
If your electric heater doesn't have a thermostat, if you replace it with one that does, you'll be able to keep your teardrop warm, but not so hot it is uncomfortable.
Rob
Waiting for "someday" will leave you on your deathbed wondering why you didn't just rearrange your priorities and enjoy the time you had, instead of waiting for a "better" time to come along...