Heat Tests - U & R Values

Width of the overall glass unit is 1 3/8" top rating in energy efficiency.

Understanding the terminology
R-value & U-factor
are the two common measures to rate how well a specific material or system resists or conducts heat flow. 

U-value  rate how much heat is conducted through the combination of materials, which means how much heat the component allows to pass through it.

  • Low U-value indicates good energy efficiency - U-0.35 would be better than U-0.43.
  • U-value is based on scale of zero to 1.

R-valueused to rate how well a material resists the flow of heat through it. The higher an R-value is, the more heat loss it resists, and therefore the more energy efficient window is. For example, R-19 is better than R-11.

Converting from U-values to R-values
You may have noticed that U-values tend to be very small numbers. Because R-values rate heat loss resistance and U-values rate actual heat loss, they are the opposite - or reciprocal - of each other. Therefore, you can convert from one to the other using the following formulas:

  • 1/R-value = U-value, or 1/U-value = R-value.

Solar Heat Gain Coefficient (SHGC)measures a window's ability to reduce heat gain by blocking the heat-producing rays. It's based on scale of zero to 1.

  • A high coefficient will allow more sunlight and warmth in to the house.
  • A low coefficient will block more sunlight to reduce summer heat gain.

Visible Transmittance (VT) is an optical property that indicates the amount of visible light transmitted. While VT theoretically varies between 0 and 1, most values are between 0.3 and 0.8. The higher the VT, the more light is transmitted. A high VT is desirable to maximize daylight.

The following is a list of our Energy Star Qualified products. It also includes the energy ratings and the corresponding U and R values.

OSTACO 2000 WINDOORS INC (ENERGY STAR)


For Windows:
Style Product Name U R SHGC ER ENERGY STAR
Zone(s)
Casement (single) Enersense 0.17 5.9 0.26 34 A B C D
Product Name: ENSENSE_CASEMENT_272-CL-180, NRCan: NR5743-5097760-ES
Casement (single) Enersense 0.17 5.9 0.17 29 A B C D
Product Name: ENSENSE_CASEMENT_366-CL-180, NRCan: NR5743-5097764-ES
Awning (single) Enersense 0.17 5.9 0.26 34 A B C D
Product Name: ENSENSE_AWNING_272-CL-180, NRCan: NR5743-5097752-ES
Awning (single) Enersense 0.17 5.9 0.17 29 A B C D
Product Name: ENSENSE_AWNING_366-CL-180, NRCan: NR5743-5097756-ES
Fixed (Picture) 3 1/4 Core 0.29 3.4 0.6 39 A B C D
Product Name: CORE_PICTURE_LOE180, NRCan: NR5743-4967229-ES
Fixed (Picture) 3 1/4 Core 0.27 3.7 0.36 27 A B
Product Name: CORE_PICTURE_LOE272, NRCan: NR5743-2078722-ES
Fixed (Picture) 3 1/4 Core 0.26 3.8 0.24 21 A B
Product Name: CORE_PICTURE_LOE366, NRCan: NR5743-2079502-ES
Single Slider 3 1/4 Core 0.32 3.1 0.51 29 A B C
Product Name: CORE_SINGLESLIDER_LOE180, NRCan: NR5743-4967232-ES
Fixed (Picture) 3 1/4 Core 0.26 3.8 0.24 21 A B
Product Name: CORE_PICTURE_LOE366, NRCan: NR5743-2078733-ES
Single Slider 3 1/4 Core 0.3 3.3 0.3 20 A B
Product Name: CORE_SINGLESLIDER_LOE272, NRCan: NR5743-2078733-ES
Double Slider 3 1/4 Core 0.31 3.2 0.5 30 A B C
Product Name: CORE_DOUBLESLIDER_LOE180, NRCan: NR5743-4967225-ES
Double Slider 3 1/4 Core 0.3 3.3 0.3 20 A B
Product Name: CORE_SINGLESLIDER_LOE272, NRCan: NR5743-2078720-ES
Double Slider 3 1/4 Core 0.28 3.6 0.2 15 A
Product Name: CORE_DOUBLESLIDER_LOE366, NRCan: NR5743-2079500-ES
Single Hung 3 1/4 Core 0.31 3.2 0.51 30 A B C
Product Name: CORE_SINGLEHUNG_LOE180, NRCan: NR5743-4967231-ES
Single Hung 3 1/4 Core 0.3 3.3 0.3 20 A B
Product Name: CORE_SINGLEHUNG_LOE272, NRCan: NR5743-2078732-ES
Double Hung 3 1/4 Core 0.31 3.2 0.51 30 A B C
Product Name: CORE_DOUBLEHUNG_LOE180, NRCan: NR5743-4967223-ES
Double Hung 3 1/4 Core 0.3 3.3 0.3 20 A B
Product Name: CORE_SINGLEHUNG_LOE272, NRCan: NR5743-2078719-ES
Double Hung 3 1/4 Core 0.29 3.4 0.2 15 A
Product Name: CORE_DOUBLEHUNG_LOE366, NRCan: NR5743-2079499-ES
Fixed casement 3 1/4 Core 0.29 3.4 0.45 30 A B C
Product Name: CORE_FIXED_CASEMENT_LOE180, NRCan: NR5743-4967227-ES
Fixed casement 3 1/4 Core 0.28 3.6 0.28 21 A B
Product Name: CORE_FIXED_CASEMENT_LOE272, NRCan: NR5743-2078721-ES
Fixed casement 3 1/4 Core 0.27 3.7 0.18 17 A B
Product Name: CORE_FIXED_CASEMENT_LOE366, NRCan: NR5743-2079501-ES
Casement 3 1/4 Core 0.29 3.4 0.45 30 A B C
Product Name: CORE_CASMENT_LOE180, NRCan: NR5743-4967221-ES
Casement 3 1/4 Core 0.28 3.6 0.28 21 A B
Product Name: CORE_CASMENT_LOE272, NRCan: NR5743-2078718-ES
Casement 3 1/4 Core 0.27 3.7 0.18 17 A B
Product Name: CORE_CASMENT_LOE366, NRCan: NR5743-2079498-ES
Fixed (Picture) 4 9/16 Core Plus 0.29 3.4 0.6 39 A B C D
Product Name: COREPLUS_PICTURE_LOE180, NRCan: NR5743-4967216-ES
Fixed (Picture) 4 9/16 Core Plus 0.27 3.7 0.36 27 A B
Product Name: COREPLUS_PICTURE_LOE272, NRCan: NR5743-2078734-ES
Fixed Casement 4 9/16 Core Plus 0.28 3.6 0.45 31 A B C
Product Name: COREPLUS_FIXED_CASEMENT_LOE180, NRCan: NR5743-4967215-ES
Fixed Casement 4 9/16 Core Plus 0.26 3.8 0.27 23 A B C
Product Name: COREPLUS_FIXED_CASEMENT_LOE272, NRCan: NR5743-2078737-ES
Casement 4 9/16 Core Plus 0.28 3.6 0.27 21 A B
Product Name: COREPLUS_CASMENT_LOE272, NRCan: NR5743-2078723-ES
Casement 4 9/16 Core Plus 0.28 3.6 0.18 15 A
Product Name: COREPLUS_CASMENT_LOE366, NRCan: NR5743-2078740-ES
Casement 4 9/16 Core Plus 0.29 3.4 0.46 29 A B C
Product Name: COREPLUS_CASMENT_LOE180, NRCan: NR5743-4967219-ES
Single Hung 4 9/16 Core Plus 0.31 3.2 0.54 33 A B C D
Product Name: COREPLUS_SLOPESILL_SINGLEHUNG_LOE180, NRCan: NR5743-2078727-ES
Single Hung 4 9/16 Core Plus 0.29 3.4 0.32 22 A B
Product Name: COREPLUS_SLOPESILL_SINGLEHUNG_LOE272, NRCan: NR5743-2078739-ES
Double Hung 4 9/16 Core Plus 0.31 3.2 0.52 30 A B C
Product Name: COREPLUS_SLOPESILL_DOUBLEHUNG_LOE180, NRCan: NR5743-4967218-ES
Double Hung 4 9/16 Core Plus 0.29 3.4 0.31 20 A B
Product Name: COREPLUS_SLOPESILL_DOUBLEHUNG_LOE272, NRCan: NR5743-2078738-ES
Single Slider 4 9/16 Core Plus 0.31 3.2 0.53 32 A B C
Product Name: COREPLUS_SINGLESLIDER_LOE180, NRCan: NR5743-4967217-ES
Single Slider 4 9/16 Core Plus 0.29 3.4 0.32 21 A B
Product Name: COREPLUS_SINGLESLIDER_LOE272, NRCan: NR5743-2078735-ES
Double Slider 4 9/16 Core Plus 0.31 3.2 0.51 30 A B C
Product Name: COREPLUS_DOUBLESLIDER_LOE180, NRCan: NR5743-4967214-ES
Double Slider 4 9/16 Core Plus 0.29 3.4 0.3 21 A B
Product Name: COREPLUS_DOUBLESLIDER_LOE272, NRCan: NR5743-2078736-ES
All products presented in the chart above are Double glazed, have Metal spacers and Argon gas filling.

For Patio Doors:
Style Product Name U R SHGC ER ENERGY STAR
Zone(s)
Sliding Door Moose 0.33 3.0 0.53 30 A B C
Product Name:MOOSE_PD_LOE180_XL, NRCan:NR5743-4967182-ES
Sliding Door Moose 0.31 3.2 0.32 20 A
Product Name: MOOSE_PD_LOE272_XL, NRCan: NR5743-4877538-ES

 All products presented in the chart above are Double glazed, have Metal spacers and Argon gas filling.

 Energy Efficiency Values:
U = U-value (Btu/h*ft2*F) - The lower the number, the more energy efficient the product.
SHGC = Solar Heat Gain Coefficient – The higher the number, the higher the solar gain.
ER = Energy Rating (W/m² or dimensionless) – The higher the number, the more energy efficient the product.

Ostaco Windows and Doors Heat Tests - U & R Values - 1