Technically speaking it is possible to use diesel fuel as a home heating oil. Oil heat is the most common means of heating homes, historically. However this is an expensive way to heat homes as the price of home heating oil is market driven. Traditional home heating oil and diesel fuel have the same chemical composition, which makes diesel fuel a possible substitute for home heating oil.
While it is possible to use diesel fuel as home heating oil in a pinch, it is not the most financially sound decision for an extended period of time. The tax rate on diesel fuel is higher than that of home heating oil.