You fully expect your furnace to provide you with warmth during the chilly season, so a lack of heat from your furnace is certainly a cause for concern. You should expect a consistent, efficient performance from your furnace. A decline in heat can be caused by a multitude of factors, so it is recommended to contact an HVAC professional to diagnose the cause of low heat.
Doing so will prevent further damage and a costly repair bill. Below, we have provided a list of potential issues that can cause low heat.