To reduce the temperature in your greenhouse or conservatory, apply shading to the outside of the windows; internal shading is only suitable for limiting the amount of sunlight that plants receive.

Blinds

Blinds are a versatile method of shading the greenhouse as they may be rolled up or down depending on the intensity and angle of the sun. They can be fitted to the glazing bars on the inside of the greenhouse across the whole of the greenhouse, or simply in one particular section. Automatic blinds are also available that open or close at certain pre-set temperatures. Ensure that the material is hard-wearing and the mechanisms are rust-proof.

Paint-On Shading

Shading washes are an efficient, cost effective way to reduce greenhouse heat, whilst still allowing light through for good plant growth. The traditional style of shading gives a 'whitewash' effect, and may be applied by brushing or spraying onto glass. It may simply be wiped off at the end of the season to allow enough light to reach your plants. Do bear in mind that many of these whitewash solutions are not suitable for polythene or plastics.

A more modern version of paint-on shading is weather sensitive, designed to react to the prevailing weather conditions. When it's dry, the shading turns white, reflecting the rays of the sun to protect the greenhouse from heat and glare. However, when the weather is wet, the shading becomes clearer, allowing more light to penetrate.

Fabrics and Nets

Woven and mesh fabrics and nets may be installed on the exterior or interior of greenhouses to provide effective shading. They are usually supplied in continuous lengths so that they may be simply cut to size and attached to the greenhouse frame as necessary. The amount of light reduction will vary considerably depending on the type of fabric; however, the temperature will not be significantly reduced.

Films

Dot matrix films are very effective for shading greenhouses and conservatories; this soft, flexible, perforated film can be secured to the inside or outside of windows by static electricity to reduce both heat and glare. As it is unaffected by heat, cold or moisture, it will stay attached in all types of weather. It is easy to install, easy to remove and can be re-used year after year - simply roll up and store away when not required.

Rigid Polycarbonate Sheets

Tinted polycarbonate sheets may be fixed to the inside or outside of greenhouses to provide shade. However, although they reduce the amount of light entering the greenhouse, the light transmitted may not be of sufficient quality for successful plant growth.