09/25/2026
FAQ:
Single stage, two stage, constant torque, variable speed.
What does it all mean?
Here’s the homeowner version.
Single stage furnaces operate at one heating output. When they’re on, they’re on.
Two stage furnaces can operate at a lower or higher heating output, giving your home more flexibility as temperatures change.
Constant torque refers to the blower motor. It’s designed to maintain more consistent airflow as conditions in your HVAC system change.
Variable speed takes airflow control even further, adjusting the blower speed to better match your home’s needs for more consistent temperatures, quieter operation, and improved comfort.
Which one is best?
That depends on your home, your comfort expectations, and your budget. And in Southern Alberta, where temperatures can change dramatically, choosing the right system matters.
Find your Lethbridge Trane Pro to explore the right furnace for your home:
https://tranecanadamidwest.com/trane-pros-lethbridge-ab/