The heat insulation should be a priority when choose windows and doors in New York, Vancouver, Toronto, the representative regions that are cold in winter or in Phoenix, Antonio, Las Vegas, the representative regions that are hot in summer.
Recommended Series: IV68 WOOD-ALUMINUM; IV78 WOOD-ALUMINUM
Recommended Configuration: 5+12A+5LOW-E,5+9A+5+12A+5
Best Configuration: 5+9A+5+12A+5LOW-E
Recommended Basis: Thermal Calculation