At our homes, we need everything to be clean and in a working condition. We always make sure that all the household gadgets we have in our homes should be working properly and free from any dust or impurities. The heating system available at our homes should be well-efficient and absolutely clean so that we remain free from germs and do not fall ill. Although we keep the servicing of our heating devices done time to time, some parts of the furnace may be requiring some repairing. How do we know about that? 
There are a few proven signs, which we need to consider in order to get furnace repairing or cleaning done. These signs are described below:
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Thermostat does not work
When we keep on turning up the heat and the furnace does not heat up, it means or furnace either needs repairing or it needs a clean-up. It can sometimes be due to a loose wire or electric malfunction but that can only be confirmed when we call a HVAC technician to home for checking the furnace completely.
Different Noises
If you hear some strange sounds such as, popping, banging, screeching, or humming coming from your furnace. You should understand that some parts of the furnace need to be replaced. 
Using an old furnace
Although the life expectancy of a furnace is approximately 20 years, still it is required to be repaired and cleaned properly after 15 years so as to maintain its longevity. Also, the age of the furnace does not matter in some cases. If the repair costs are more expensive than the cost of a new furnace, then it is better to invest in buying a new one instead of getting the old one repaired. 
Dust all over the house
If you notice dust and dryness all over the house, it may be the reason for your furnace being unclean or having some faults. This furnace malfunction can cause many health issues including certain allergies and asthma.
Increase in heating bills
If your furnace heating system is not working at its highest efficiency, it can cause a rapid increase in your electricity bill. This is because the heaters in the furnace loses out their effectiveness and the electricity consumption becomes on a higher side. When such changes are noticed, it becomes mandatory for us to get the furnace cleaned and repaired. Knowing the reasons for the repair and cleaning of your furnace, you should get it analyzed from a well-trained HVAC technician in a timely manner to avoid the hassles associated with it. The HVAC systems should be serviced timely so as to increase the time span of your furnace. After all getting the repairs done in a timely manner can save us from ending up without a working heater in extreme cold conditions when the heating services are much needed. This can also save you from spending a higher amount in buying a new furnace if you get the timely servicing done.
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