Replacement Window GuideA garden window is a small projecting greenhouse set into a wall opening, most often over a kitchen sink. It combines shelf space for plants with operable side panels for ventilation, and its sloped top is built from tempered glass for durability.
The projecting box and its shelves
Unlike a flat window, a garden window extends out past the wall to create usable interior depth. Window World lists adjustable shelves available in numerous configurations, which is what makes the style a home for potted plants and herbs.
The structure is built to hold up to weather while projecting from the wall. Window World states the unit provides superior strength and durability against wind and weather.
Side vents and a tempered top
Ventilation on a garden window comes from the sides rather than the front. Window World states that the functional side windows are easily opened for access to fresh air.
The angled top is a safety-glass component. Window World states the sloped top insulating glass unit is tempered for improved integrity and durability, and describes an energy-efficient design that helps keep a home comfortable.
Judging the glass on the label
A garden window has a lot of glass area, so the glazing spec drives its comfort. ENERGY STAR explains that Solar Heat Gain Coefficient measures the fraction of solar energy transmitted, with lower meaning less solar heat let in, which matters for a sunny sink-side box.
ENERGY STAR also notes that U-Factor measures the rate of heat transfer and tells you how well the window insulates, and that certified products are independently tested, certified, and verified.