1. Able to satisfy the criteria for EnergyStar Canada: for the purposes of this directory this is considered an authoritative source of furnace test results.
2. Annual Fuel Utilisation Efficiency [AFUE] of over 95% (higher than the EnergyStar requirement of 90%, so the majority of EnergyStar approved furnaces are not included in this directory).
3. A variable-speed, electronically commutating d.c. motor for the fan.

The AFUE should be tested in accordance with Canadian Standard CGA P.2-1991.

Full current lists of furnaces meeting our criteria may be found in the "recommended models" section.

[Full EnergyStar lists may be found here]