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I'd suggest getting a humidifier. See if you can borrow one and try it out for a while and see if it makes any difference. If I'm right, then it should.
If you can't borrow one, and this is convienant for you [as long as you don't have little walkers toddling in the house] then you can put a pan with water in it on top of your baseboard heater. Soup cans with water will work as well if your heaters aren't wide enough for anything bigger.
If you have any paper work from the company that did your house, I'd read it carefully. Your warranty may not be expired, they may be just telling you this so they don't have to pay for anything. Unfortunately, a lot of places do this to people [we used to deal with an insurance company that did that to us a lot, but we read the fine print and knew better].
But I am betting tht you burn candles in your house and the sooty film is from the wicks.
Modulars tend to be really "tight"....... air/ventilation.......
Buy a CO2 detector