Yes, if you get it done professionally, insulation can be quite an expensive affair. A professional setup would see you hiring a contractor who would charge you for the material, the labour, and for his services. All of this would require tearing down certain portions of your existing interiors and installing additional layers so that they can retain heat. This is a complex and tedious process which can take quite some time to get done with. However, if you decide to do it yourself, you can save quite a bit of money but you need to know exactly what you are doing.