Many homes come with an appliance to keep warm. One of the most popular heating devices can be the furnace. They can be difficult to fix heaters, so be sure you take all precautions. In this article we'll discuss some preventive maintenance will help you avoid the need for repairs to your heater. If you are checking the furnace, first thing to be doing is to check the filters. Air filters are used to clean your furnace's air before it can enter your house. Air filters are prone to collecting dust with time which can make them less efficient. It's not difficult to replace an air filter. You can simply check the type of filter to see if it needs replacement. Visit any hardware shop and buy the same filter…