Not exactly my sentiment, but some similarity here...
I don't have a dehumidifier in my room/house, nor do I keep the aircon on 24/7. I just make sure I keep my guitars in their cases after I'm done playing. Wipe 'em down and keep them covered, is my policy.
I actually kinda like the fact that the guitar is affected to some extent by humidity levels...it gives me a good reason to pamper my guitars every once in a while by taking them to a good luthier for a setup. Then they come back all nice and pretty and feeling good again.