Reduces heat transfer at the edge of the window
Basic physics reminds us that heat moves toward cold. This means heat from the sun in summer, and from your furnace in winter, will be drawn to the edges of your windows where they’re coldest. A high-quality spacer reduces this heat loss by increasing the window’s edge temperature, thereby improving the window’s overall thermal performance and energy efficiency.
Keeps the argon gas where it belongs.
The gas fill between window panes also contributes to energy efficiency. Gases like argon are denser than air, which slows the transfer of heat from one side of the window to the other. The spacer seals the gas inside the IGU so it can do its job. If the seal fails, the gas escapes, and takes a large part of the window’s energy efficiency with it.
Prevent moisture from fogging the glass.
On top of gas escaping, a broken seal gives an opportunity for moisture to become trapped inside the IGU, causing irritating condensation. Once condensation forms inside the IGU, it can’t be repaired.