There is no difference between our double hung and our single hung window except for the top sash of the single hung is fixed in place. There are advantages to wood single hung windows and we do recommend that configuration. Even though our weather-stripping is extremely efficient, nothing can beat sealing the upper sash in place to eliminate all possibility of air infiltration. Since the single hung window is stationary, it’s easier to get the meeting rails to properly mate and seal when closing, unlike the double hung window where it’s sometimes necessary to hold the upper in place while closing and latching the window. Since the single hung window is sealed in place after installation, it does not require weather-stripping which makes it slightly less expensive. Like all our sash, our single hung wood windows are available with all the muntin and glass configurations found under our window solutions page.
We offer a variety of glass types in any shape you need including; highly efficient and space saving Spacia Vacuum Insulated Glass, regular insulated glass, monolithic glass, and wavy glass.
There have only been a handful of predominant sash molding profiles from 1865 on. The most common profile and our standard is the “Roman Ogee”, while other profiles are available.
Our use of insulated glass, our own Window Logic weather stripping system, and high quality constant force balancing systems provide the efficiency of modern windows with historical accuracy.
We maintain historical aesthetics by setting glass 7/8″ deep into the sash from the interior to create a shadow line that helps provide character. Most modern manufacturers ignore this crucial detail.
Heirloom Ultima Windows are unquestionably the most historically accurate window on the market with contemporary performance. See how Accoya wood and VIG combine to satisfy both preservationist and conservationists.
Magnum Windows are Heirloom’s original product and identical to the Ultima except the Magnum utilizes standard IG (Insulated Glass) which makes the sash thicker. See why it’s sometimes the best option.
Heirloom Classic windows are the classic historic replica window with either standard double strength glass or even wavy glass. The Classic is the right choice if True Divided Lite construction is required and it is available with or without Heirloom’s proprietary invisible weather-stripping system.