If your remodeling a corner rooms outside wall and the room is curved in dust anyway, keep going onto the other wall. Even if you only plan on change out one window insulated the whole room. Many oldder home have little to no insulation in the walls. With the cost of a little more insulation and sheetrock you will get your money back in heat bill.
With a well insulated room now you can buy a larger window or two without worring about if your heater will keep up. Spend the money on materials with an higher efficiency rating and you should be saving money for years to come.
Always keep your energy savings in mind, in the long run you’ll be happy you did.
