March 29, 2015
Wonder Windows is proud to install and distribute Okna Double Hung Windows. Okna Windows have been designated as "Most Efficient 2015" 
by energystar.gov
Compare Okna with other "Most Efficient 2105" Double Hung Windows below.
* for more information on understanding performance ratings see (Understanding NFRC)
*data source: http://www.energystar.gov/index.cfm?c=most_efficient.me_vertical
OKNA Windows & Doors
| Product Line |
CPD Number |
U-Factor |
SHGC |
Frame Type |
PG |
Climate Zones |
|
Insul Tec – 500 / 5500 Series |
OKW-K-18 |
0.15–0.19 |
0.23–0.26 |
Vinyl | 50 | N, NC |
|
Insul Tec – 505 / 3500 Series |
OKW-K-20 | 0.20 | 0.23–0.26 | Vinyl | 50 | N, NC |
|
Precision Weld – 400 Series |
OKW-K-22 | 0.20 | 0.26 | Vinyl | 50 | N, NC |
| Enviro Star – 800 Series | OKW-K-23 | 0.16-0.20 | 0.23–0.26 | Vinyl | 60 | N, NC, SC, S |
| Starmark – 900 Series | OKW-K-32 | 0.15-0.20 | 0.22-0.24 | Composite | 45 | N, NC, SC, S |
Champion Window
| Product Line |
CPD Number |
U-Factor |
SHGC |
Frame Type |
PG |
Climate Zones |
|
Comfort 365 Extreme Energy |
CHW-A-8 |
0.20 |
0.25 |
Vinyl | 30 | N, NC, SC, S |
Marvin Windows & Doors
| Product Line |
CPD Number |
U-Factor |
SHGC |
Frame Type |
PG |
Climate Zones |
|
Wood Ultimate Glider |
MAR-N-400 |
0.20 |
0.21–0.21 |
Wood and Clad Wood |
50 | N, NC, SC, S |
Pella Corporation
| Product Line |
CPD Number |
U-Factor |
SHGC |
Frame Type |
PG |
Climate Zones |
|
350 Series Sliding Window (Nail Fin) |
PEL-N-192 |
0.18–0.19 |
0.22–0.42 |
Vinyl | 40 | N, NC, SC, S |
|
350 Series Sliding Window (Pocket Frame) |
PEL-N-201 | 0.18–0.20 | 0.22–0.24 | Vinyl | 40 | N, NC, SC, S |
|
Pella 250 Series Sliding Window with Advanced Low-E |
PEL-N-210 | 0.20 | 0.22-0.25 | Vinyl | 25 | N, NC, SC, S |
Soft-Lite LLC
|
Product Line |
CPD Number |
U-Factor |
SHGC |
Frame Type |
PG |
Climate Zones |
|
Barrington |
SSL-A-12 |
0.18–0.20 |
0.18–0.27 |
Vinyl |
40 |
N, NC, SC, S |
|
Barrington |
SSL-A-46 |
0.18–0.20 |
0.18–0.27 |
Vinyl |
40 |
N, NC, SC, S |
|
Bainbridge |
SSL-A-36 |
0.17–0.19 |
0.18–0.27 |
Vinyl |
40 |
N, NC, SC, S |
|
Classic |
SSL-A-60 |
0.17–0.20 |
0.17–0.26 |
Vinyl |
35 |
N, NC, SC, S |
|
Pro |
SSL-A-61 |
0.17–0.20 |
0.17–0.26 |
Vinyl |
35 |
N, NC, SC, S |
|
Imperial LS |
SSL-A-30 |
0.17–0.20 |
0.15–0.24 |
Vinyl |
55 |
N, NC, SC, S |
|
Elements |
SSL-A-28 |
0.16–0.20 |
0.15–0.24 |
Vinyl |
55 |
N, NC, SC, S |
