Re: Seeking Advice on Drafty/cold house
To a point it may be possible adding the attic venting is creating more drafts.
Basically , the attic now has more negative pressure which is good for venting the attic space .
Unfortunately it also now shows all the weak points of air leakage in your home.
Chances are there are points of air infiltration from the inside living space into the attic which need to be sealed. Simply adding blown in insulation doesn't air seal the penetrations from things like the plumbing vent stack , electrical boxes and duct work ( if equipped ).
With an increased negative pressure in the attic --- air from the living space is drawn up through leaks into the attic --- meanwhile this also draws in air from outside from other leaks in walls , electrical boxes , windows , doors , etc..
Air sealing leaky areas is one of the most important steps for making the home comfortable.
More than likely your home was always cold ( relatively speaking ) since it isn't well insulated ( well at least the walls now ) however, you probably didn't feel the drafts as much before. Cold drafts can make you feel more uncomfortable because of moving air across your body tends to cool your body temperature.
Adding insulation to the walls is a definate advantage for keeping the home comfortable but , you must also find and seal the source of air leaks to complete the picture.
"" an ounce of perception -- a pound of obscure "