Re: humidifier or dehumidifier for sinus infection??
If it is sinus dryness.. humidifiers never worked that well for me. However my latest ENT who is top notch recommends sinus rinsing with Pretz PH balanced sinus saline solution OTC use it in the morning when you wake then use any steroidal sinus sprays you might be on ore medical sinus sprays like Nasonex and Astelin.. then use it periodically as need through the day. On really cold dry days 4x seems to be the sweet spot for me.
Also there is a great OTC Nasal oil. It is called Ponaris. You can order it online or have the pharmacy get you some. But you put half to a quarter of a dropper full up each nostril morning and especially at night before bed and you are golden. This is an iodine fortified oil and it is known to fight all the rhinitis's as well as fungal irritants and infections.
My regime is wake.. Pretz, Ponaris.. don't even need Nasonex anymore.. maybe about lunch if it is cold and dry.. Pretz.. home wash face Pretz before dinner.. then Pretz after my shower followed by Ponaris and zyrtec and the rest of my meds. I have a humidifier built into my CPAP, but other than that I have no need for them in my house or at work.
If we learn by our mistakes, I am working on one hell of an education.