No heating system lasts forever. Sooner or later every homeowner is faced with the decision on how to replace the furnace. You may be thinking about doing it yourself to save money, and if you are looking at a unit located at ground level, it may seem possible. This is especially true if you are a do-it-yourself homeowner and have a history of doing many projects for your home. However, the following are just a few important reasons to work with a professional furnace installation company.