When trying to manage heat throughout your home, we always say that you should start from the outside before working your way in. Although it may be easy and a quick fix to hang blinds or curtains internally, external shading solutions are far more effective at preventing the build-up of heat that occurs through windows and other openings.
Indoor solutions certainly have their place, of course and are best used in combination with external shade provided by louvres, shutters, awnings or simply trees, if you are lucky to have established landscaping.
We recommend blinds to solve issues of light and shade (where heat is not a concern) and privacy, to name a few. If you believe that heat may be a mild issue, it is best to consider a fabric with a reflective backing that will direct excess light and heat outside again.
Windows are the single-greatest source of solar heat to your home. Glazing allows the sun’s rays to directly enter your home, which may be lovely when natural light is desired, however this light brings heat. During this process, the light hits furniture and occupants and is converted from short wave radiation to long wave radiation, which is re-radiated by those objects and travels through glass far less readily.
Heat therefore builds up within the room. If internal blinds are used to shade the room, the space between the glass and the blind is the perfect environment for this process and can therefore often reach temperatures of up to 20°C greater than the room itself.
Adding a source of shade outside the window instantly reduces the amount of light that can travel directly through the window and if full shade is provided, only diffuse light will be able to enter, vastly decreasing the temperature inside your home, and likewise, your cooling expenses.
Hella’s External Venetian Blinds have the capacity to reduce the effects of outside temperatures by up to 95%. In Summer, they are able to achieve this because the blinds reflect heat and UV rays before they are able to permeate the glass. In winter, the blinds create an air cushion between the blades and the glass, preventing the circulation of air and reducing energy consumption required for heating by up to 30%.