I have a 20+ yo vinyl sided house in west Georgia. Nat. gas heating system with the furnace/air handler in the attic. Full ventilated soffit around the perimeter with a gable style roof. There are wall vents at each gable end of the house just under the peak. My house has always been comfortable in the Winter. This year, not so much. Its been cold somewhat in NOV this year and the interior feels chiily and drafty. The heat seems to run a bit more than last year. At the prices we're paying for fuel this year, I don't need that especially going into the dead of winter. So looking at what has changed this year vs. last. I had a new roof put on the house in July with the Cobra peak ventilation system. That is standard for roof replacement with GAF shingles in this area apparently. My sister had a similar roof put on her house, similar size and construction, a couple years ago and her house is not drafty like mine. The one difference I see between our houses is hers does not have the gable end vents on the side walls. Is my roof now "over ventilated" causing it to be drafty? If so, how do I correct it? Thanks in advance for any help.

I bought a home with a [url=https://www.faberonline.com/hoods/cristal-ss/]CRIS30SS600[/url] vent hood for the gas range. I should have spotted these issues but it is what it is. The hood is really loud and also not very effective at venting. Its a 3 speed motor rated for 335, 450, and 560 CFM. After some inspection, I noticed the builder transitioned right after the hood from 6" to 4" piping. So the 4" is def undersized and I dont have access to replace all of it with 6" pipe. Any thing I can do to fix this? Get a lower CFM motor? Replace as much of the 4" duct with 6"? Thanks.