How old is your furnace? Most furnace operate reliability are between 20 to 30 years
What is the efficiency of your furnace? Older furnaces can be 50% AFUE while new furnaces are 92% AFUE or higher giving you more heat for less money. AFUE stands for Annual Fuel Utilization Efficiency which means how much heat that furnace will generate in a average year compared to the amount of energy it will consume to do it. The furnaces blower fan is not included when calculating the rating yet it is a substantial contribution to the furnaces operating costs. Optional variable speed ECM blower motors can reduce electricity use as much as 75% less contributing to lower electricity expenses.
Signs that may indicate furnace replacement:
Is your furnace 20 years or older?
Is your furnace a mid efficient 80% AFUE or lower?
Is your furnace noisy? Rattles, squeaks, humming or banging?
Do you have humidity problems?
Are some rooms hotter or colder than others?
Does your furnace cycle on and off frequently?
Are your energy bills going up despite usage staying the same?
Has you furnace needed repairs more frequently?
If you have any of these warning signs you may want to have a HVAC professional inspect your heating system and provide you with the necessary information to make the right decision.