You’re inside your home, beginning to shiver as the temperature outside dips lower and lower.
You go to turn on your furnace, looking forward to that warm, cozy air.
But instead you’re greeted with your furnace blowing cold air.
That’s definitely not right – so what’s going on?
1. Your Furnace Isn’t Warmed Up Yet
That icy blast of cold air can stir up a sense of panic, particularly if temperatures are going to drop later in the day.
If this is the first time you’re turning on your furnace for the season, make sure to wait several minutes. It’s like bringing a kettle to boil – it doesn’t happen instantly.
After approximately 10-15 minutes, if your furnace is blowing cold air, start moving down this list.
2. Your Thermostat is Set Incorrectly
Thermostats make our lives so much easier. They’re also the first place you should look if your furnace isn’t working properly.
It’s easy to have your thermostat set incorrectly, particularly when the seasons change from summer to fall and we turn on our furnaces for the first time.
You want to make sure that your thermostat setting is ‘Auto’, not ‘On’. When it’s set to ‘on’, the fan on your furnace will blow even when your furnace isn’t on. When it is set to ‘Auto’, your furnace and fan will come on at the same time, as intended.
If your thermostat isn’t working properly, check out this resource >
3. The Furnace Filter is Dirty
Air filters catch dust and debris we generate in our home. That means they need to be changed on a regular basis.
An overly clogged air filter will limit airflow to your furnace, and could cause it to overheat and turn off. Then you’ll only be getting cold air.
This is something you can check yourself – just make sure your furnace is turned off before you look at or remove the filter from the air handler.
4. Your Furnace Has Overheated
When your furnace overheats, there’s a safety mechanism that actually will shut your furnace down. So not only will your furnace be blowing cold air temporarily, but it’ll actually shut off.
There are a few reasons your furnace could be overheating (besides a clogged filter):
- Dirt buildup – if your filter was clogged, chances are dirt and debris worked its way into other parts of your furnace. If that dirt is in moving components, like the blower, it can cause your furnace to overheat.
- Mechanical failure – as a furnace experiences wear and tear, it’s possible for your furnace to overheat because one of the moving parts isn’t performing correctly (or at all).
- Age – as a furnace ages, it stops performing as well. Even with the best preventative maintenance, it won’t last forever, and could start overheating if certain parts can’t perform.
5. The Condensate Line is Clogged
High-efficiency furnaces have condensate lines that move water away from the furnace.
A clog in the condensate line will prevent your furnace from igniting. No ignition means only cold air coming through your vents.
Have Husky Come Take a Look
It’s safe for homeowners to try fixing the thermostat and air conditioner. But if your furnace is still blowing cold air after you’ve tried those, call us – don’t try to repair your furnace yourself.
The friendly professionals at Husky can diagnose and repair the problem on any make or model of furnace. We can also perform preventative maintenance after the repair is complete, to prevent this from happening in the future.Learn More About our Furnace Services