6 Common Reasons Why Your Heat May Not Be Working and Estimated Repair Costs

Kenneth Wilson

If you go to turn on your heat only to realize that your system isn’t working, it’s a worrying time. Not only will your house be cold, but you will potentially face a costly repair bill to troubleshoot and then rectify the issue.

With this in mind, what are some of the reasons that your heat might not be working? And how much can you reasonably expect to pay for repairs? Let’s dive in and take a look.

Six Reasons Why Your Heat is Not Working

1. Poorly Maintained System

For your heating system to work efficiently and effectively, it’s so important to maintain and service it regularly. If you have spent a long time without maintaining, cleaning, or servicing your heating system, it’s little surprise that it doesn’t work as it should.

Here are some of the reasons why a poorly maintained heating system might not be working:

  • The air filters are dirty or blocked, which has affected the efficiency of the system. It’s advisable to change your air filters a couple of times every year, so if you’ve never changed them, this is the first place to look for an issue.
  • Another cleanliness issue is that of the blower motor. If it’s dirty, the heat exchanger won’t work as it isn’t exposed to enough moving air. Again, checking and cleaning the blower motor regularly is an important maintenance task but is often neglected by homeowners.
  • If the burners within your heater are dirty or dusty, they won’t work as well as they should. And while dirty burners might not necessarily render your system broken, it certainly won’t work as efficiently as it should.

Ultimately, a poorly maintained heating system is so often the root cause of your issues. Fortunately, the solution is straightforward. We’d advise you to check and replace the air filters a few times a year and clean out the system before the winter months kick in.

It’s also a good idea to pay for your system to be professionally cleaned and serviced once every year, so you can rest assured that your heating system will work as and when you need it.

2. Inexpertly Installed System

In some cases, the reason that your heating system isn’t working might be a direct result of the way it has been installed. This is often a problem for people who have installed the system themselves or might result from shoddy work from building firms who have worked on your behalf.

The primary determinant of a heating system that has been inexpertly installed is the configuration of the ductwork. If your system doesn’t have correctly sized and installed ductwork, it cannot possibly operate at the desired level of efficiency.

And while an inexpertly installed heating system might work in the short term, it will almost certainly break down in the future. If you call in an engineer to take a look at your system, and they advise you that the system has inadequate ductwork, the best thing to do is to repair or replace it as soon as you can to prevent the system from breaking down completely.

3. Broken Heat Pump

Naturally, one of the most integral aspects of a heating system is the heat pump itself. If the pump isn’t working, you will be able to tell right away as your system won’t kick in as it should. Equally, you might hear a whirring sound from within the system that indicates that the heat pump is about to go.

In most instances, you can replace the component parts of a broken heat pump, particularly if the issue stems from dead starting components, which is one of the most common issues that occur within the pumps themselves. However, if your system is particularly old and your pump is working inefficiently, it might be time to replace it.

While you have no choice but to fix a broken heat pump, performing regular maintenance throughout the year will reduce the risk of the pump breaking in the first place. It’s a good idea to think of your heating system as being like a car – if you don’t service and maintain its core components, it will break down!

4. Inadequate Refrigerant

Following on from the last point, if there’s an issue with your heat pump, it might be due to the fact that it has inadequate refrigerant. Refrigerant levels within a heat pump are directly tied to the heat strips, and if your refrigerant is too low, the strips will kick on more frequently than you would like.

When this happens, your heating bills will skyrocket, as the pump has to work harder and more frequently to heat your home. It can also cause your compressor to overheat, and it will eventually break down.

Heat pumps in older homes are typically installed with inefficient refrigerant that doesn’t last as long as that within newer models. Newer refrigerant (R-410A) is much more efficient and is less likely to leak and lead to a breakdown of your system. This type of refrigerant is also much better for the environment.

So, while inadequate refrigerant might not cause your system to stop working completely, it will mean that your heat pump is much less efficient and costlier to run. Repairing or replacing the refrigerant within a heat pump is a job for the professionals.

5. Faulty Draft Inducer

Within your heating system is a device known as a draft inducer. Its primary role is to clear the heat exchanger of leftover has from previous cycles and to vent all gas that is produced when the furnace combusts. When the draft inducer is faulty, it will have to work much harder to function, which will eventually cause it to burn out.

There are several reasons why your draft inducer might be faulty, but it often stems from the fact that dirt and debris have been allowed to accumulate for too long. Sometimes, a simple clean will solve the issue with your draft inducer, but other times, it will need to be replaced.

And with this – you’re probably noticing a pattern! The more you leave dust, dirt, and debris to accumulate within your heating system, the more likely it is to become broken or damaged.

6. Damaged Heat Exchanger

One of the key components of any home heating system is the heat exchanger within. (Related: What Is A Heat Exchanger In A Furnace?) And a common issue with heat exchangers is that they may well crack, particularly if the system is old and poorly maintained.

And while a damaged heat exchanger might not immediately render your system ineffective, it will have the following negative effects:

  • Your system will not be able to work at full capacity and is likely to cost more in heating bills.
  • Typically, a damaged heat exchanger is indicative of another issue within your heating system. It can then lead to the overall failure of your system.
  • A damaged heat exchanger is dangerous because of the level of carbon monoxide within. When it’s damaged, carbon monoxide can leak into your home, which is dangerous for your health.

If your heating system has a damaged heat exchanger, it’s so important to replace it right away.

How Much Does It Cost to Repair a Damaged Heating System?

According to Home Advisor, it typically costs homeowners between $131 and $485 to repair a damaged heating system, but it can be considerably more (or less) depending on what needs to be replaced.

Relative to the common issues that we’ve introduced above, below is how much you can expect to pay to make the necessary repairs:

Required Repairs

Estimated Costs

Air filters

$10- $50

Blower motors

$400 - $1,500


$75 - $250

Re-installation of air ducts


Heat pump



$225 - $500

Draft inducer

$200 - $1,500

Heat exchanger

$500 - $1,500

The cost of repairing your heating system will be influenced by various factors, including the cost of labor in your region, as well as the overall condition of your heating system, and the extent of the work that is required. You can expect to pay anywhere between $50 - $150 per hour for heating repair costs.

For best results, we would advise you to have your home heating serviced and cleaned once every year, which is likely to cost between $250 and $500, which you should account for in your annual budget.

As we’ve explained throughout, regularly cleaning and maintaining your heating system will reduce the likelihood of your system breaking down or becoming damaged, so it’s well worth investing in an annual service to ensure it is operating efficiently.

Final Thoughts on Maintaining Home Heating Systems

The most important takeaway from this article is that a broken heating system is most likely to be caused by a system that has been poorly maintained. As such, it’s so important that you schedule service once a year in order to improve the efficiency of your system and to ensure it works at full capacity.

And if you’ve noticed that your heating system isn’t working efficiently for any of the reasons introduced above, it’s best to call out an engineer to investigate before your heating system packs in completely.

Kenneth Wilson
December 20, 2021

Kenneth Wilson

Retired contractor. Currently residing in Southwest Florida. Now in semi-retirement, I write and manage this blog focused on helping home owners make savvy decisions when it comes to finding contractors and getting their projects done. I also operate remodeling design service for homeowners.

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