Keeping your home warm during a Canadian winter isn’t always as simple as turning up the heat. When the temperature really drops, your main heating system might need a little help. That’s where auxiliary heating comes in.
You may not notice it working, and that’s kind of the point—it’s there in the background, stepping in when your regular system can’t quite keep up. Whether it’s a sudden cold snap or your heat pump needs support, auxiliary heat makes sure your home stays comfortable.
In this post, we’ll explain what auxiliary heating is, why it matters, and how it fits into your home’s overall heating setup. If you’ve ever wondered why your heat runs more often on colder days, this might answer a few of your questions.
What is Auxiliary Heating?
Auxiliary heating is just a backup source of heat. It’s there to help out when your main system can’t quite keep up—usually on really cold days.
When your main system can’t keep up—usually on very cold days—auxiliary heat kicks in to help out. Most people have it and don’t even realize it. It runs in the background when needed.
If you use a heat pump, this matters more. Heat pumps work great most of the year, but in freezing temperatures, they lose some efficiency. That’s when the auxiliary heat turns on. It fills the gap so your home doesn’t get cold.
You don’t have to do anything. The system handles it on its own. You might see a message like “AUX Heat” on your thermostat, but otherwise, it’s out of sight, out of mind.
It’s not a separate system. It’s part of how your heating setup deals with really cold weather. Simple as that.
How Does Auxiliary Heating Work?
Auxiliary heating is the extra heat your system uses when your main heater can’t keep your home warm enough.
The Role of Auxiliary Heating in HVAC Systems
Most homes have heat pumps as their main heater. Heat pumps take heat from outside and bring it inside. But when it’s freezing outside, they can’t pull enough heat from the cold air. That’s why auxiliary heat exists—it steps in automatically when needed.
Also, sometimes the heat pump needs to melt ice off its outdoor parts. While it does that, the auxiliary heat keeps your home warm. This way, you never feel the cold while your system is working.
You don’t have to turn anything on yourself. The system knows when to use auxiliary heat. Usually, it’s quiet and you won’t even notice it running.
Types of Auxiliary Heating
Auxiliary heat can come in different forms, depending on your house:
- Electric heaters are common and use electricity to warm the air fast. They’re reliable but can use more power.
- Some houses use gas furnaces or boilers as a backup heater. These start working if the heat pump can’t handle the cold.
- In some places, oil or propane heaters are used as auxiliary heat, depending on what kind of fuel is available.
No matter what kind you have, auxiliary heat is just there to help out when your main heater needs a hand during the coldest days.
Benefits of Auxiliary Heating
Auxiliary heating is sort of like a backup heater that helps out when your main system can’t handle the cold on its own. It’s not something most people notice until it’s really needed.
Increased Comfort During Extreme Weather
Have you ever noticed some rooms in your house feel colder than others? Even when the heater’s on? That’s because your main system might be struggling, especially on really cold days. Auxiliary heat jumps in to warm those cold spots so you don’t end up shivering in your own home.
And it’s not just about warming cold spots — it keeps the temperature steady, too. Nobody likes it when it feels hot and then suddenly cold, right? Auxiliary heat helps avoid that by keeping things even.
Energy Efficiency and Cost Considerations
You might think running extra heat means your bills will go through the roof, but actually, auxiliary heating only kicks on when it really needs to—like during the coldest days or when your main heater is doing a defrost cycle.
Because it shares the workload, your main heater doesn’t have to work overtime, which saves energy and keeps your heating system in better shape for longer. So yeah, it might actually help keep your energy bills a little lower.
Safety and Reliability
Auxiliary heating’s kinda like a backup plan for your heater. If your main system breaks or needs fixing, the auxiliary heat kicks on so your place doesn’t turn into an icebox.
This is really important when the power goes out or if you’re getting your heater fixed. It means you won’t be stuck freezing just because something’s wrong with the main setup.
When Do You Need Auxiliary Heating?
Auxiliary heating isn’t something you always need, but there are specific times when it really comes in handy. Let’s break down when it makes sense to rely on it.
Cold Climate Conditions
If you’re living somewhere that gets seriously cold — like those freezing Canadian winters — your main heating system can sometimes struggle to keep your whole house warm. When it’s super chilly outside, that’s when auxiliary heat kicks in to help out. It’s like the extra boost you need to stay cozy when the temps drop too low.
Inefficient Primary Heating Systems
Sometimes your primary heating system might be old or just not quite right for your home. Maybe it’s too small or just not efficient anymore. In those cases, auxiliary heat is a way to keep warm without having to replace your whole heating system right away. It fills the gaps when your main heat isn’t enough.
Backup During Heating System Maintenance
Even the best heating systems need maintenance or repairs from time to time. When your main heater is off for servicing, you don’t want to be left out in the cold. Auxiliary heating acts as a backup during these periods. It keeps your home warm and comfortable while the main system is being worked on.
How to Choose the Right Auxiliary Heating System
Here are a few simple things to think about when picking the right auxiliary heat for your home.
Consider Your Home’s Size and Layout
Let’s start simple. How big is your place? A small apartment isn’t going to need the same things as a two-storey house. And think about how heat flows in your home — do some rooms get cold faster? Are there areas that stay warm no matter what? You’ll want something that makes up for the weak spots without overdoing it. No need to heat the whole house if it’s just one room that needs extra help.
Evaluate Your Existing HVAC System
Next, look at what you already have. Is your furnace newer, or does it groan when it kicks on? If your main system works fine most of the time, you might only need a small boost on really cold days. But if it’s struggling on a regular basis, then you might need a more reliable secondary setup.
Think About Energy Efficiency Ratings
It’s worth checking the energy efficiency before buying anything. A cheap heater might seem fine at first, but if it runs up your bill, it’s not really saving you much. Look for something rated well — maybe not the fanciest, but definitely something that won’t cost you more in the long run.
Consult With a Heating Professional
Here’s the part most people skip — just ask someone who knows what they’re doing. Seriously. HVAC professionals have seen it all. They’ll know what works in your area, for your type of house, and based on your current setup. A quick visit or even a phone call can save you hours of second-guessing. Better than buying something, using it once, and realizing it’s not the right fit.
Conclusion
Auxiliary heating might not be something you think about every day, but when winter really settles in, it can make a noticeable difference. Whether it’s a particularly cold week, a struggling furnace, or just that one room that never seems to warm up — having backup heat can be the thing that keeps your home feeling comfortable.
It’s not about replacing your main heater but making sure you don’t feel that cold spot or get caught without heat if something goes wrong.
If you’re not sure what’s right for your space, it’s always a good idea to talk to a professional. A bit of planning now can save you a lot of discomfort later.
You can reach out to us. We’ve helped homeowners across the GTA figure out what works best for their homes. If you’ve got questions or want an expert to take a look at your setup, we’re just a call or message away. Let’s make sure your home stays warm and comfortable — no matter what winter brings.
