Which makes more sense to you? CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10% ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%
So, if you're not terminating the vent for the drain above the level of the float switch, what happens when the drain clogs downstream of the vent? The water pours out of the vent before it has a chance to trip the switch. We always terminate above the height of the primary pan, even if it means drilling another hole in the deck.