First thing you have to proceed is to exchange your old, wooden windows. They aren't keeping warm air inside of your rooms. And you do not need to waste a lot of money, just regular PCV
products will be enough. You only need to check out the offers in the internet and find one that will be the best for you. You can have windows in any shape you like, so do not be worried about it. Another step is wall insulation, interior and exterior, you need to invest in some modern finishing coat. It is much bigger cost, but you do not need to do it at the same year, next spring will be also fine. Because you are going to live in your house for the rest of your life, so you have enough time for changes.
Newest technologies are whole focused on environment. People are far more aware about all actions and how it influence on Earth. When you spend enough money for wall insulation, you will save many of your funds and help to guard our environment from impurity. You will see the virtues in the time of future winter, into your warming costs