Cold Air Through Vents

[George Stump]

We have a fairly new home (5 years old). On cold windy days when the heater is not blowing warm air, cold air will come through the vents. It's not particularly strong but it's noticeable and I'd like to fix it if I can.

The air ducts under the house appear to be tight. My garage door allows air into the garage and since the furnance is out there I was wondering if that air can blow into the house through the (gas) furnance?

Any ideas of where this cold air might be coming from will be much appreciated!

GS

[Hube]

Welcome to the forum... Since you say "its not particularly strong" could mean that the house is under a very slight "negative" pressure.This can happen when the house is very tight and has exhaust fans,(bathroom- kitchen) or a clothes dryer operating. Also ,depending on the DUCT lay-out,adding external insulation to any supply or return ducts that are in a cold area (garage) will help to eliminate this air inducement. Let us know what you find, and good luck, Hube