Natural Gas Furnaces - Product Overview
The most common way to heat your home is with a forced-air system that
distributes warm air through ducts in your home. New forced-air furnaces
are only available in high-efficiency AFUE (Annual Fuel Utilization
Efficiency) rating. The main difference between the new high efficient
furnaces compared to older mid efficient furnaces is the purchase price, operating costs, and venting.
Starting December 31st, 2009 only furnaces with AFUE equal or greater
than 90% will be sold in Canada.
High-Efficiency Natural Gas Furnaces:
only furnaces that qualify for the Energy Star* label
have energy efficiency ratings from 90-97% AFUE (Annual Fuel
deliver up to 97% (with 90% being the average) of the heat they
produce into your home, losing only 3% up the chimney
will save you up to 24% in energy costs compared to a mid-efficiency
natural gas furnace
have additional heat exchange surfaces that extract more heat
require a floor drain to dispose of the water formed during the
do not require a chimney as combustion products are vented through
PVC or ABS plastic pipe out the side of the house
extract additional heat from natural gas
are also referred to as a condensing furnace***
are the best choice for energy efficient and well-sealed homes
create less carbon dioxide
FACT - If you have a furnace that is more than 15-20 years old, it is generally 55-
60% efficient which means that you are only using 55-60% of every heating dollar.
No longer sold in
Canada as of December 31, 2009
Have lower energy
efficiency ratings ranging from 78-82% AFUE (Annual Fuel Utilization
Efficiency**), which means you’re making use of 78-82% of
every heating dollar.
Is usually vented
vertically through a lined chimney or B-vent
Energy Star is a program that helps consumers easily identify their
most efficient new products by category. Find out more details about
** The Annual Fuel Utilization Efficiency
(AFUE) rating measures the amount of fuel converted to space heat in
proportion to the amount of fuel entering the furnace. This is commonly
expressed as a percentage. Energy Star labeled furnaces must meet or exceed
90% AFUE energy efficiency rating.
*** Condensing furnace - A
high-efficiency furnace is often called a condensing furnace because it
extracts extra heat by condensing water vapour from the natural gas
combustion products. This step recovers additional heat, resulting in a
+The Annual Fuel Utilization
Efficiency (AFUE) rating measures the amount of fuel converted to space
heat in proportion to the amount of fuel entering the furnace. This is
commonly expressed as a percentage. Energy Star labeled furnaces must
meet or exceed 90% AFUE energy efficiency rating.