I am a lifetime environmental allergy sufferer. Been getting shots since I was a kid. Never married, I am still single at 54 because I can't find one single woman out there who doesn't have pets. In recent years, my biggest challenge has become WINTER allergies. That is — constant issues with indoor air quality. For whatever reason, my body CANNOT tolerate forced air furnace heat (especially when sleeping at night). As soon as winter arrives, my life becomes miserable.. constant drainage, sore throat, stuffy nose, ears, etc. I sold my first house, which I loved, because something in it was causing constant allergic reaction in the winters. Then bought a new house and was met with even worse reactions to the forced air heat. Needless to say, I've grown to hate winter.. and forced air.Some of the things I've tried:– Getting the air ducts cleaned.– Good filters for the furnace– I got one of those really expensive Aprilaire filters installed in my furnace, and noticed ZERO difference in my issues– Removed all carpeting– Humidifier installed on furnace– Sleeping with window cracked open– Honeywell air cleaner in the bedroom– Increased the "dust" in my allergy injections– Sleeping under a little makeshift "tent" on my bed, to reduce the inhalation of air flowing out of the ductsAfter all of these measures, it remains a complete mystery to me. What is causing this reaction? I am completely fine in the summer, when that furnace is not running. So what is coming out of those ducts that is so bad? Wondering if I should have them cleaned again.This is an older house, and so was my previous one. I wonder if that could be a factor. I spend my winters pondering a multitude of such questions, and constantly trying new things, in hopes that someday I might stumble across something that works. I would love to hear from anybody that has suffered with similar issues.