Are you curious to know how much it will cost to repair your furnace? A furnace is composed of many working parts, and not all of them are complex or difficult to replace. It might be that some parts are cheaper while some others are more expensive to get fixed.

Depending on if you have to repair one part or multiple components, repair costs can be more or less high. This article list all the average costs to fix each part of your furnace, but if you want to get an accurate estimation to repair your furnace, check here.

Furnace repair costs by components

If you want to estimate the repair costs required for your furnace, it is better to figure out which of the components need to be repaired and add up the price for each part. This should give you an estimate of the total costs.

Here are the main furnace parts and their repair costs:

Blower motor


The blower motor is responsible for pushing air through the ducts. Regular cleaning can prevent unwanted damages, unneeded repairs and decrease the costs over a long period.

Repairing a blower motor can cost anything between $150 to $500. But if you need to replace the entire blower motor, it could cost you up to $2000.


At times the furnace has nothing wrong, but a malfunctioning thermostat can make it look like the furnace need to be repaired. On the other hand, if the thermostat is not working or has a problem can make the furnace work too much and increase your utility bills.

If you have to repair a thermostat, the costs can be anything between $100 to $300, and if you need to replace the entire thermostat, you could end up spending up to $600, although there are cheaper models.

Heat exchanger


The heat exchanger is an essential part of the heating system. It is responsible for getting the air wormed up before it gets circulated into the house. In some instances, the heat exchanger can get damaged or develop cracks.

Cracks are dangerous because they allow carbon monoxide to leak into the house. You might have to spend up to $200 to repair the heat exchanger and should be prepared to spend between $500 to $1000 to replace it.

Flame sensor

A flame sensor is responsible for confirming whether or not there is a flame burning inside the furnace. When there is no flame, the sensor will make sure to shut off the furnace to prevent gas leaks inside the house.

It is essential to prevent gas poisoning and explosions. However, repairing it can cost up to $250.

Draft inducer motor

The draft inducer motor has the purpose of moving air and various gasses out of the furnace and through the vents.

It is essential to determine how fast the air will flow through the heat exchanger to prevent the build-up of carbon monoxide, which can be dangerous due to fire hazards and poisoning.

If this part gets damaged, you can expect to spend between $200 and $1500.


The ignitor is a safety measure for a furnace. It is supposed to signal the furnace when it is ok to ignite. It can detect the flame and can communicate to the furnace that it is safe to turn on the gas supply.

If the ignitor needs replacement, you could spend between $150 and $250. Remember that sometimes the ignitor can be just dirty, which will prevent it from detecting the flame. Regular cleaning and maintenance can prevent unnecessary repairs or replacements.

Oil Furnace Combustion Chambers


This component can be found only in oil furnaces. It is composed of two chambers that are responsible for transforming oil into energy to heat the house. Therefore, you could expect to spend between $200 and $800 to repair or replace the chamber or one of its components.

Gas valve

The gas valve regulates the flow of gas into the system. It makes sure that there isn’t too much gas flowing and that all the safety measures are in place. To replace the valve, you could expect to spend between $200 and $600.

Control or circuit board


The circuit board is responsible for operating the furnace. It is a sort of central control system composed of circuits that control the gas valve, the flame sensor, the ignition, and the blower motor.

If you need to repair it or replace it, you are looking at spending between $200 and $600.

Flue Pipe

The flue pipe is there to make sure that toxic gasses are leaving the house. If you need to repair it or replace it, you are looking at spending between $ 400 and $800.

High limit switch


The high limit switch has to do with the electricity flow in the furnace. If you need to replace it or repair it, you are looking at spending between $150 and $300.


The transformer is necessary for a furnace to make sure that the electric flow is compatible with the system and that it has the proper voltage. If you have to replace or repair the transformer, you can spend up to $170.



The furnace is short-cycling when it constantly turns on and switches off without reaching the temperature set on the thermostat. It can happen because of clogged filters, blocked heat grates, an oversized furnace, a damaged fan, flame sensor failure, and a dirty blower motor wheel.

You can expect to spend up to $400 to repair or fix a short cycling problem.


Fortunately, it is possible to repair single components of a furnace instead of having to replace it entirely. Knowing the average costs of repairing every part can help you figure out the budget you might need to maintain your system.

If you are not sure about the state of your furnace and want to get a full inspection done, you should have a professional isolate potential problems and advice you.