In winter, generated heat rises and escapes through the roof. Polycarbonate, with a typical u - value of between 2.3 and 3.0, whilst generally having better insulation than glass, is still the principle cause of heat loss.

M G Sun Control Systems solar inserts reflect radiated heat back into your conservatory, lowering the u - value, which slows the rate of heat loss during winter months. This helps to make your conservatory more comfortable.