I suppose that the cold could effect health
but remember that the germ or virus has to be present regardless of the temp. The cold temp does not of itself make a person sick
A body fighting the cold may be more susceptable to desease so avoid crowds and stay warm by adding more clothing. Temps of 65-70 should save a lot of fuel and be sufficient for good health.
I take 1000mg of C each day and hope that helps.