What are some signs that my HVAC system is not working properly?

There are many indicators that a heating and cooling system is not working properly, even if it is still heating and cooling your home or business. Loud or increased noises, increased run-time, higher electric bills, higher humidity, hot and cold spots, inability to maintain a temperature. All of these are signs that your HVAC system is not working properly and may need to be serviced before a problem worsens.