Sometimes it can be hard to tell if it’s time to call a repairman. Furnaces are big and complicated machines so it’s usually best to leave it to a professional to diagnose any issues. However, there are a few things you can keep an eye on to make sure your furnace is running properly.

Some that indicate you need professional help are:

• No hot air
• The system isn’t staying on
• The furnace won’t turn on
• Unusual or loud noises
• The unit is leaking water