But main problem you must to think about is your windows. Possibly you got, vintage, wooden ones? They are looking very cute, for sure, but it is not enough. When you will exchange it for some modern, PCV pieces, you could be able to keep many of warm air inside of your rooms. You do not need to replace each piece at ones, you could do it in several steps, to avoid too much expenditures in one week. Different relevant issue is your roof. If you will cover it with any fibreglass mesh, it could also keep your house far warmer in the time of winter, cause most of the air is escaping trough it, possibly.
Next, you may invest some of money in external wall insulation. It could be very huge cost, but it is worth it, read more here: solix (solix). During several years, costs of it would come back to you into the warming expenditures. Beside, if you wish, you could at the end make some interior insulation as well, exerting also fiberglass mesh – it is the best item for all this kind of works. But where you could buy all the materials? It is really easy, go to the nearest building department. You will find there all the stuff you require, from screwdrivers to fibreglass mesh.
If you are scared of cold season, because of big expenditures for healing, there is a nice solution. You must to organize an external wall insulation and exchange vintage windows with PCV ones, read more: finishing coat (finishing coat). It could help you to save many of money, and it is fantastic for environment, cause you should waste a lot less energy. And the finest season to start overhaul like this is spring. So maybe you will consider it?