They have A/Cs that recycle the condensation that they remove back into the air, but not every unit does this (usually the moisture is just dumped somewhere outside). But yours probably doesn't do this so like everyone else said, you need a humidifier.

Don't get one if those crappy little 1 gallon ones that create big clouds of steam; you have to use distilled water or all the junk that's in your water will get atomized and into your lungs. Buy a basic evaporative humidifier instead (the kind that use a wick), one of those giant 6 gallon ones and set it to 40-50% RH. It'll keep your entire home nice and comfortable and you can just use water straight from the sink. And you only have to refill them about once a week instead of every single day. Just make sure you don't skimp out on the bacteriostat cause they will get nasty quick if you cheap out.

Alternatively the budget option is just to take showers with the bathroom door open and the vent off. Just make sure that you're monitoring the humidity levels in your home should you go this route; keep RH below 65% or you're going to have mold. If your A/Cs thermostat doesn't report humidity levels, then you can just buy a cheap meter. They're under $10 in most parts of the world.