Substitute one of the two pieces of glass with a specially coated glass ( Low E), or a colored piece of glass, (tinted), and you dramatically slow heat transfer even further. Gasses like argon or krypton can be added to the airspace to add a bit more insulating value to the window. 

The methods for constructing an insulated glass unit for residential use differ from glass units used in commercial settings. Seal durability is the primary focus. Commercial glass units use different types of sealants and are more time consuming to build but they are the most durable under the widest range of weather conditions. This is the basis on which we build our glass units.

We build our insulated glass units to commercial performance standards rather than the residential methods commonly used by most window makers. This produces the most durable glass unit that will hold up against the widest range of weather conditions. We are one of the few window manufacturers that offers this type of unit to the residential customer.

We are proud to offer the new high performance glazing from AFG, the Comfort Ti-AC36 Spectrally Selective Low E Coated Glass . This special glass provides maximum heat blockage with minimal visible light loss. Many other quality glasses are available as well. Ask your representative.