There are many ways that you might notice a problem with your heating system. One of the most common is noises: clonking or clattering, buzzing or clicking, grinding or groaning. Other possibilities include poor heat circulation, rising utility bills, or short and rapid heating cycles.
Another thing that can tip you off to a furnace issue is odor. Your heating system should not smell like anything most of the time. If you do notice a smell coming from your furnace, are repairs required? Not necessarily, but some odors indicate serious problems or emergencies.
Isn’t it great to know that whenever you need warmth and comfort in your home during the winter, all you need to do is adjust the thermostat and your furnace just switches on and starts sending heated air through the ductwork into the various rooms of your home?
When your gas furnace doesn’t come on during a cold winter day, that’s a problem. It may be a 
Our short answer to this is, “it’s not a bad idea!”
Imagine it’s the coldest day of winter, and you want into your home after a long day out to discover it’s practically no warmer inside than it was outside. Fortunately, you won’t have to deal with chilly temperatures for very much longer at the time of this blog post. But that certainly doesn’t mean you should neglect any signs you need furnace repair.