
Find the zone where you live or where the product
will be installed. Canada has been divided into four climate zones
based on annual average temperature. Zone A is the mildest, and Zone D is
the coldest.
Make sure that the product model you are buying is qualified for the
correct climate zone, or, to save even more energy, for colder zones. If
you live in a location that is significantly higher in elevation than the
surrounding area, consider purchasing a product that is ENERGY STAR
qualified for at least one zone colder than where you live (especially in
southern and central British Columbia). 
ENERGY STAR qualified windows, are tested and
certified by an independent, accredited agency. Products qualify for
ENERGY STAR based on either their Uvalue or their Energy Rating. As
well, windows and patio doors must achieve at least an A2 rating for
airtightness. The tables below show the required ratings for windows,
doors and skylights to be ENERGY STAR qualified for each climate zone in
Canada.
Zone 
Maximum UValues and
Minimum RValues 
Minimum Energy Rating (ER)
Values (Maximum UValue 2.00 W/m²•K) 

UValue (W/m²•K) 
UValue (Btu/h•ft²•°F) 
RValue (ft²•h•°F/Btu) 

(Most Windows and All Doors) 
(Picture Windows Only) 





1998 
2004* 
1998 
2004* 
A 
2.00 
0.35 
2.9 
or 
–16 
17 
–6 
27 
B 
1.80 
0.32 
3.2 
or 
–12 
21 
–2 
31 
C 
1.60 
0.28 
3.6 
or 
–8 
25 
+2 
35 
D 
1.40 
0.25 
4.0 
or 
–5 
29 
+5 
39 
*The methodology used to calculate Energy
Ratings, as defined by the Canadian Standards Association, was
changed in 2004. All windows and doors now have positive
ER numbers.
 
PERFORMANCE
STYLE 
AIR 
WATER 
STRENGTH 
ENERGY STAR 
ZONE 
Design Casement (1700) 
A3 
B7 
C5 
31 
A, B, C 
Design Awning (1700) 
A3 
B7 
C5 
31 
A, B, C 
Design Fixed Casement (1700) 
Fx 
B7 
C5 
37 
A, B, C, D 
Regal Casement (2700) 
A3 
B7 
C5 
31 
A, B, C 
Regal Awning (2700) 
A3 
B7 
C5 
31 
A, B, C 
Regal Fixed Casement (2700) 
Fx 
B7 
C5 
37 
A, B, C, D 
Marquis Casement (3700) 
A3 
B7 
C5 
29 
A, B, C 
Marquis Awning (3700) 
A3 
B7 
C5 
30 
A, B, C 
Marquis Fixed Casement (3700) 
Fx 
B7 
C5 
34 
A, B, C, D 
Design Single Hung (1800) 
A3 
B3 
C4 
31 
A, B, C 
Design Single Slider Lift (1800) 
A3 
B3 
C4 
31 
A, B, C 
Regal Double Hung (2800) 
A3 
B5 
C4 
33 
A, B, C 
Regal Double Slider Lift (2800) 
A3 
B4 
C4 
31 
A, B, C 
Regal Double Slider Tilt (2800) 
A2 
B2 
C4 
32 
A, B, C 
Marquis Double Hung (3800) 
A3 
B3 
C5 
29 
A, B, C 
Marquis Double Slider Tilt (3800) 
A3 
B3 
C5 
29 
A, B, C 
Marquis Single Hung (3810) 
A3 
B3 
C5 
29 
A, B, C 
Marquis Single Slider (3810) 
A3 
B3 
C5 
29 
A, B, C 
One Lite (3800) 
Fx 
B7 
C5 
39 
A, B, C, D  