The video explains whats happening at about minute 4:44.. The A/C temperature sensor is next to the light fixture, a regular incandescent bulb is hot and the A/C thinks its HOT in the MH.
When I was young, I worked at a TV (television) repair shop (The good ole days when TVs had tubes in them), I remember one of the service calls I went on was a complaint that it would get cold in the house when the customer turned on their brand new TV.. We sort of knew what the problem was because we've seen this before.
YUP - Their brand new color TV (round picture tube) was located against the wall with the below the furnace thermostat..
1999 Fleetwood Southwind 35S (Ford F53 6.8L V10 275hp 4R100 4 spd trans) - Toad 2003 Saturn Vue.
It won't do MACH 2, but I can get a sandwich and take a pee.