Hi all.
I'm testing the limits of what temperature differential I could maintain with 9980 btu's (about 2925 watts total between fan based heaters, and one oil filled of 484 watts), between outdoors and inside the RV.
The RV is a Class C 28'5" Kustom Koach with enclosed tanks, and dual pane windows. Three vent cushions are in use but there is a skylight over the shower--and another one in the main living area. I need to rig a covering for the sky lights.
The delta T, with 9980 btu's of electric heaters, between outside and inside the RV appears to be 23.2C. For example the temperature out side is -8.2 and the temperature inside the RV is 15 C.
This suggests about 430 Btu's per 1 degree delta T, or about 126 watts of heating.