Who said anything about not venting the condenser exhaust to the outside?It would be very wrong not to vent the Condenser air to outside. The point of refrigeration is to collect heat in the space, then either passively or by forced air from the space being refrigerated. In this case driving the condensate heat outside and away from the room.
Sucking air from the outside would only be relevant if the air outside is lower than room air. The evaporator water dripping down will lead to the condensate via drip tube to the hot air and be evaporated. Humidity would be a problem, here in Utah it's not an issue, it's so dry here it's less expensive to run a swamp cooler, effective until July and August when temps rise as and humidity increases. Then it's miserable, a well insulated home work well year round with an air conditioner, although the evaporator freezes up during lone runtimes. Again July to August, if liquid refrigerant makes it back to the compressor you will bend valves unless it's rotary, typically you won't see rotary in Air conditioners because you can't move enough volume quickly enough.