I've a sick house! (I think)
We had a new fancy variable speed furnace installed about 3 weeks ago. Since then, we've been getting up with irritated eyes (burning), cloagged up and irritated (burning) nostrils, and slightly soar throats. My little daughters cought during the night and in the morning when they wake up and have psymtoms of a cold with slight runny noses.
Nights have been cold and the furnace has been running mostly at night. Our symptoms are mostly eliminated during the day (we have an older house that is vented pretty well through the old windows! ;0) and are totally gone about a couple of hours after we leave the house.
We also have a humidifier and 2 Hygrometers that tell us inside humidity is at 40-42% (strangely, I have set the humidistat to around 30%).
I've two CO deterctors and neither indicates anything abnormal.
The contractor sent a technician back who did a visual inspection of the humidifier (ensured it is wet and water is flowing on it) and the furnace (removed the panel and looked at the flame). He then said that the problem was very likely with the air vents not having been cleaned for a long time. He suggested I get the vents cleaned and also use a better filter (I use the kind you can buy for $3-5 at home depot) to eliminate allergens. He claimed the new Infinity Carrier has a much stronger blower and that's why we had no symptoms with the old furnace.
Does this sound reasonable?
If so, what should we look for in a vent cleaning company?
Anything else to worry about?
Thank you in advance.