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What size furnace should I buy?

Square FootageFurnace BTU
1,000-1,200 sq. ft. Home40,000 - 60,000 BTU
1,200-1,500 sq. ft. Home60,000 BTU
1,500-1,800 sq. ft. Home60,000 - 80,000 BTU
1,800-2,500 sq. ft. Home80,000 - 100,000 BTU
2,500-3,500 sq. ft. Home100,000 to 120,000 BTU

Furnace Troubleshooting Wizard

Furnace not working? Use our step-by-step diagnostic wizard to identify the problem and find out
whether it’s a DIY fix or requires a professional technician.
🩺 Symptom-Based Diagnosis
🔧 DIY vs Pro Guidance
⚡ Instant Results
🔥
Furnace Troubleshooting Wizard
Which furnace issue are you having? Answer a few quick questions to help identify the most likely cause of your furnace problem and what to do next.
What is the main issue you’re experiencing with your furnace?
What color is your furnace flame?
What sound do you hear from your furnace?
How is the heating performance?
When was your last professional maintenance?
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🔍 Diagnosis Complete

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Common Furnace Problems & Solutions

Most furnace problems have a handful of common causes. Before calling an HVAC technician, work through the basic checks below — many homeowners resolve their heating issues in minutes without a service call.
SymptomLikely CauseDIY or Pro?Est. Repair Cost
No heat at allTripped breaker, thermostat, pilot lightDIY first$0 – $350
Furnace won’t stay onDirty flame sensor, thermocouplePro recommended$150 – $300
Short cycling (on/off rapidly)Overheating, dirty filter, blocked flueDIY first$0 – $200
Loud banging noiseDirty burners, duct expansion, cracked HXPro required$200 – $1,500
Blower runs but no heatIgnitor failure, gas supply issuePro required$150 – $450
High gas billsDirty filter, low AFUE, duct leaksDIY first$0 – $500
Yellow or orange flameIncomplete combustion, CO riskPro immediately$200 – $1,200
Error code on displayVaries by code — see wizardWizard + Pro$150 – $800

Step 1: Before You Call a Technician — Check These First

🔌 Check the Power
Ensure the furnace power switch (looks like a light switch near the unit) is ON. Check your electrical panel for a tripped breaker labelled “Furnace” or “HVAC.”
🌡️ Check the Thermostat
Make sure the thermostat is set to HEAT (not Cool or Fan), the temperature is set above room temperature, and the batteries aren’t dead.
🗂️ Replace the Air Filter
A severely clogged air filter is one of the most common causes of furnace shutdowns. If you can’t see light through the filter, replace it immediately.
🚪 Check Vents & Registers
Make sure all supply and return air vents in your home are open and unobstructed by furniture, curtains, or debris.
🔥 Check the Pilot Light
For older furnaces with a standing pilot light — check if it’s lit. Instructions for relighting are usually on a label inside the furnace door.
🧊 Check for Frozen Flue
In very cold weather, the exhaust flue pipe can ice over. Inspect the PVC exhaust pipe that exits through your wall or roof for ice blockages.

Furnace Error Codes: What They Mean

Most modern furnaces display error codes via LED flashes or a digital screen when something goes wrong. The number of flashes corresponds to a specific fault code — look for the code chart on a sticker inside the furnace door, or use our troubleshooting wizard to decode common error codes for top Canadian furnace brands (Lennox, Carrier, York, Goodman, Keeprite, Napoleon).

When to Call a Technician Immediately

Some furnace issues require immediate professional attention for safety reasons. Call an HVAC technician or emergency line right away if you notice: a yellow or orange flame (CO risk), the smell of natural gas (evacuate and call your gas utility), a cracked or corroded heat exchanger, or your carbon monoxide detector is alarming.

💡 Maintenance Saves Repair Bills

Annual professional tune-ups ($100–$200) prevent 80% of common furnace breakdowns
Replace filters every 1–3 months during heating season — it takes 2 minutes
Keep the area around your furnace clear of combustibles and obstructions
Test your carbon monoxide detectors monthly — furnaces produce CO when combustion is incomplete

Frequently Asked Questions

Why does my furnace turn on but blow cold air?

Several causes: the thermostat fan may be set to ON instead of AUTO (meaning the fan runs even when not heating); the pilot light or ignitor may be failing; the gas valve may not be opening; or the heat exchanger may be cracked causing the furnace to shut off on high-temperature limit. Our wizard narrows down the cause based on your specific symptoms.

🇨🇦 Rebates Available
Canadian homeowners may qualify for up to
$5,000
in federal and provincial rebates on qualifying systems.
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