I too have allergies. We have a humidifier on the furnace BUT we have a programmable thermostat and drop the temp during the day and at night for sleeping. Consequently, it does run enough to really help me.

I bought a room humidifier for the bedroom -- at an estate sale for $10.00. It makes a WORLD of difference. We keep the humidity around 45%.

BTW -- it wasn't working well at the beginning of this winter season. Finally checked the filter and it was COVERED in gray and white fur. New filter and voila!