I'm trying to weigh the diferences between running the mechanical ICE A/C compressor or an electrically driven A/C. I understand the inherient loses in having the ICE run the alternator/generator to charge the battery to run the a/c but I'm curious to see if they are even with the loses running the ICE to run the mechanical a/c compressor.

The perfect or semi perfect test would be running a FEH on a course with:
1. FEH no a/c
2. FEH with a/c
3. FEH with a/c in econ mode
4. FEH running 4400 BTU 360W 30A electric a/c

A 3000 BTU unit would be preferable but I haven't been able to find one online yet.

What is the average FE drop when using a/c in both econ and regular modes?