Residential Furnaces are used for heating homes. Their source of heat may be electric power or fuel. The oil/gas contractor or grid is responsible for providing energy to the furnaces which are responsible for heating the water running through the radiator or the hot air blown by the blowers through the heating ducts. Furnaces can be categorised on a different basis. Their general categorization, however, can be made like this:
  1. Mid-efficiency furnaces
  2. High-efficiency furnaces

The former type of furnaces are about 80% efficient. They have a combustion chamber below the heat exchanger. It warms the air circulated by the blower through the heating ducts. The lighter combustion gases are then vented out through the chimneys.
The later type of furnaces are 90% efficient. These furnaces are also called condensing furnaces. They have an additional heat exchanger which extracts the heat from the combustion gases before they are vented out of the chimneys. Now that we're done with the general types of Furnaces, it is now the time to learn what is a Red Tag Furnace.

A Red Tag Furnace:

A red tag is a product warning tag. By warning, it means that the appliance is no more safe to use and is dangerous for human beings residing inside homes. A red tag is issued by a licensed technician placed on the gas appliances, gas
pipes or oil pipes supplying oil as a fuel to the boiler.Example of a red-tag is a gas appliance having a defective heat exchanger. If the heat exchanger is defective, gas will leak through it which may then get mixed with the gases blown inside homes. The leaked gases through heat exchanger contains carbon monoxide which is hazardous. Carbon-monoxide accumulates in the blood which lowers the blood capability to carry oxygen. When someone receives a red-tag, local utility is notified and natural gas or oil supply is disconnected for safety. So that's what a Red Tag furnace is. Clear now? Let's not move towards fixing of a Red Tag Furnace.

Fixing a Red Tag Furnace:

A red tag furnace must be repaired or replaced. After receiving a red-tag, immediately call a licensed contractor who provides home comfort services like Cosmopolitan Heating and Cooling that provides services of repairing and replacing red-tag furnaces. Remember that the severity of warning varies according to the emission of carbon monoxide. The licensed technician may identify an immediate danger and cut off the natural gas supply immediately or may give a stipulated time to repair or replace the Red Tag Furnace.


If you care for your life and the life of others, it is highly recommended to fix the Furnace whenever it is tagged red. The tagging is done for the safety and security of homeowners so the homeowners should also consider the seriousness of the matter so that neither they get harmed nor someone because of them.  

On a final note, taking a Red Tag Furnace lightly is never a good idea. Fix it as soon as possible.

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