I suppose I could survive an ice age.... My house is a smallish ranch,  well insulated.   I don't have a rifle,  so I would have a slight disadvantage with hunting,   but my 357 magnum is pretty accurate for a handgun ... any animal within about 15-20 yeards should  take only 1 or 2 shots,  and I've got a couple hundred rounds of ammo ....    My snowmobiles would provide mobility If I needed speed or towing power if the roads got to the point that my subaru was grounded.  I have 2 of the same model snowmobile,  so I could use the "worse one" as a parts machine when things start going bad ....   to work outside,  without freezing to death,  I could erect a large snowfort and build a bonfire inside  ....  fuel would obviously be a major concern.   Due to the scarcity of fuel,  I'd probably stick to traveling on foot, cross country skiis or snowshoes ...   I have 4 x 5 gallon gas cans (2 are premixed with 2 stroke oil),  and a 2.5 gallon can,  and I would make it last....   Also have several trees on my property,  and over 200 acres of forest preserve under a mile away ... 
I think the first couple of months of an ice age would sort of be fun, like a giant blizzard,  though once reality set in,  it would be major suckage ....