SunSwitch - installation and design guide The key to successful heating for your terrace area is to install enough heaters of the right power output and type. We include guidelines for mounting heights and the size of area you can expect to be heated on our products pages. > GO TO PRODUCTS PAGES NOW In theory, in perfectly still open air, SunSwitch infra-red heaters should be comfortable to sit under in temperatures as low as 7-8° C. However, air is rarely still and we find that the heaters work very effectively from about 12-13°C. This means your outdoor covers should be productive from early March to late October. In fact, we have seen customers outdoors in the UK under SunSwitches in early January. Mounting your SunSwitch infra-red heaters under an awning or parasol will tend to trap some of the warmth, making them feel warmer (so heat regulation may be required). Similarly, providing protection from the wind, for example with Terrazzo terrace screening will greatly increase comfort levels. Example of an installation The diagram and picture below show typical installation of 1.3kW heaters along a restaurant frontage.