I was able to look it up last night and the answer is 7000BTU.
The power to the unit has a 15 amp breaker, 120V X 15 amp = 1800W. Therefore a 2200W gene will work with a little reserve.
This unit is A/C only and does not have reverse cycle heat.
1997 2400 SCR
5.7 Vortec / Bravo 2