How Long Does It Take to Replace a Furnace?
Replacing a furnace isn’t something most Calgary homeowners do often, but when the time comes, you want to know how long you’ll actually be without heat. The short answer: most standard furnace replacements take between 4 and 10 hours, but several factors can stretch that timeline.
This guide walks you through what affects installation time, whether replacement can be done in one day, the best time of year to schedule, and how to prepare. By the end, you’ll know exactly what to expect so you can avoid those chilly surprises.
What’s the Average Time for Furnace Replacement?
For most Calgary homes, furnace replacement takes one working day. A straightforward swap like replacing an older natural gas unit with a new high-efficiency model usually wraps up in 4 to 10 hours.
However, if your home needs ductwork upgrades, venting changes, or electrical modifications, the job can stretch to 1–3 days. This is more common in older homes in neighborhoods like Inglewood or Mount Pleasant, where duct systems don’t always meet modern standards.
What Factors Affect Installation Time?
Not every furnace install is equal. A few key factors can shorten or stretch out the process:
Age and size of the home
Older Calgary homes often need extra work before a new furnace can go in. Outdated duct systems, smaller venting, or unconventional layouts can add hours to the job compared to newer builds with modern setups.
Condition of existing ductwork
If your ducts are leaky, corroded, or undersized, technicians may need to repair or replace sections before installing the furnace. This adds time but pays off long-term, since efficient ductwork helps the new system run better and lower energy bills.
High-efficiency furnaces cost more upfront but can reduce heating bills significantly. Plus, local programs may help offset costs. You can check our page on furnace rebates in Calgary.
Furnace type and efficiency
A basic natural gas furnace is usually a straight swap, but high-efficiency models often require new venting, drainage, or electrical adjustments. These upgrades improve performance and comfort but naturally extend installation time.
Accessibility of the furnace area
A furnace located in a spacious basement is much quicker to replace than one tucked into a crawlspace or tight mechanical room. Limited access means technicians spend extra time maneuvering equipment and completing the job safely.
Permits and inspections
Calgary requires permits for new furnace installations, and inspections may be scheduled once the work is complete. While this step adds a bit of time, it ensures your installation meets safety codes and is properly documented.
Does Furnace Removal Add Extra Time?
Yes. Removing your old furnace and safely hauling it away usually adds 1–2 hours to the project.
This step can take longer if the old unit is oversized or corroded. It can also be a struggle to remove it if the furnace room is in a tight space with limited clearance. Also, Asbestos-lined ductwork or older venting will need professional handling.
Most Calgary installers, including our furnace installation service, include disposal of the old unit in the quoted price, so you don’t need to worry about surprise add-ons.
Can Installation Be Done in One Day?
In most cases, yes.
In most cases, yes. A skilled Calgary furnace installation team can remove your old unit and install the new one in under 10 hours. For homeowners, that usually means heat is restored the same evening.
Complex installs like switching to a high-efficiency furnace that needs new venting or a condensate drain may spill into a second day.
Is Winter a Good Time to Replace a Furnace?
It might not seem ideal, but yes, you can replace a furnace in winter. Technicians often use temporary heating solutions during the day, so you won’t be left freezing.
That said, spring and fall are the sweet spots. Scheduling is easier, prices may be more competitive, and you avoid making rushed decisions during a –25 °C cold snap.
How to Prepare Your Home for Furnace Replacement
You don’t need to do much, but a little preparation goes a long way:
- Clear space around the furnace so technicians can move freely.
- Keep pets and kids away from the work area for safety.
- Ask your installer about permits and inspections. Calgary requires them for new installs.
Confirm disposal of the old furnace. Reputable companies (like us) include this service.
How Much Does Furnace Replacement Cost in Calgary?
On average, furnace replacement in Calgary costs $5,000 to $7,500.
The price depends on furnace brand and efficiency level, size of the unit (measured in BTUs), and whether ductwork or venting upgrades are needed. For Issues with Goodman units or Carrier repair services, we can help you assess whether repair or replacement is the right move before committing.
For a deeper breakdown, we’ve also covered new furnace costs in Calgary in detail.
Frequently Asked Questions
How long should a furnace installation take?
Most jobs finish in 4–10 hours. If ductwork or venting needs upgrades, expect up to 3 days. Comfort Union always provides clear timelines before starting work.
Can a furnace be replaced in one day?
Yes, most replacements are done in a single day. Only complex installs (like high-efficiency conversions) may require a second day.
How long will I be without heat during installation?
Usually 6–8 hours. If it’s a winter replacement, technicians can provide temporary heaters so your home doesn’t get too cold.
Is it safe to replace a furnace in winter?
Yes, Calgary HVAC teams handle winter replacements regularly. The key is planning: avoid waiting until the furnace has completely failed to prevent emergency rush installs.
How much does furnace replacement cost in Calgary?
Most homeowners spend $5,000–$7,500, depending on brand, size, and installation complexity. At Comfort Union, our quotes are upfront and transparent, so there are no surprises.
When’s the best time of year to replace?
Spring or fall is ideal. Scheduling is easier, you avoid rushed winter emergencies, and you may catch seasonal promotions.
For more about furnace efficiency and safety, see Natural Resources Canada.
If you’re considering replacement, Comfort Union offers furnace repair and installation services tailored for Calgary homes, so you always get the right solution at the right time
Affordable and reliable furnaces offering lifetime heat exchanger warranties. Ideal for homeowners prioritizing cost-effectiveness
Affordable and reliable furnaces offering lifetime heat exchanger warranties. Ideal for homeowners prioritizing cost-effectiveness
Affordable and reliable furnaces offering lifetime heat exchanger warranties. Ideal for homeowners prioritizing cost-effectiveness
