Heartland Collection

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At The Heartland Collection™ (STI), we strive to provide our customers with product of the highest standard. We monitor our vinyl replacement windows for quality and consistency, using computer-controlled manufacturing processes and revolutionary quality management systems. It's no wonder we're an industry leader in vinyl window manufacturing.

Building Code Considerations

Due to the varied State and Local Building Codes, it is the sole responsibility of the individual purchaser, and/or contractor/builder to insure the windows/doors comply with existing building codes, I.E. Ingress-Egress requirements, safety glazing requirements and location of products. Please contact your Local Building Codes Official prior to purchase.

Replacement

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U-Value

SHGC w/grids

Product
Series

D-P
Rating

Size
Tested

Clear

Low-E

E Argon

Clear

Low-E

E Argon

5650DH

44x60

0.48

0.34

0.31

0.54

0.28

0.27

7150DH

44x60

0.48

0.35

0.32

0.52

0.27

7150PW

48x72

0.46

0.32

0.28

0.55

0.29

0.28

7150SL

72x48

0.48

0.35

0.32

0.52

0.27

7250 Csmt/Awn

36x72

0.44

0.31

0.28

0.52

0.32

New Construction

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U-Value

SHGC w/grids

Product
Series

D-P
Rating

Size
Tested

Clear

Low-E

E Argon

Clear

Low-E

E Argon

2350SH

44x60

0.49

0.36

0.32

0.56

0.35

2350SH

44x60

0.49

0.35

0.32

0.56

0.35

2350PW

84x60

0.47

0.33

0.29

0.59

0.37

2350SL

72x60

0.49

0.35

0.32

0.56

0.35

2350SL

72x60

0.49

0.35

0.32

0.56

0.35

2450DH

44x60

0.49

0.35

0.32

0.55

0.35

2450PW

72x60

0.47

0.33

0.29

0.59

0.37

2250Csmt

36x72

0.44

0.31

0.28

0.52

0.32

3550DH

48x74

0.47

0.33

0.30

0.54

0.27

3550DH

48x74

0.47

0.33

0.30

0.54

0.27

3550SL

72x60

0.46

0.33

0.29

0.52

0.27

0.26

3550SL

72x48

0.46

0.33

0.30

0.52

0.26

3550PW

73x72

0.47

0.33

0.29

0.59

0.31

0.30