Spainish Town using Vine Canopies to Reduce Heat Re: 3,0000 yr old Persian Technique [View all]

Fascinating, low cost technique used by their sherry wineries. Reduces temps by 8°C. That is equal to about 14.4°F.

From The Guardian:

Green canopies of grapevines festoon the town, reducing street-level temperatures by as much as 8C. “We’re planting vines in the old city because we hope that in two or three years we’ll be able to brag that this has put an end to stifling temperatures,” said Jesús Rodríguez, president of Los Emparrados, a group of residents who aim to beautify and green the city’s streets.

For decades the local sherry producers have kept their wineries cool with emparrados (vine arbours) but now the practice has been extended to a cluster of streets in the old town.

Not only are vines part of the essence of Jerez, they also have several advantages over trees. They need to be watered only in the first two years and they are deciduous, letting in the winter sun between November and March. Within three years of planting they will form a complete canopy over a narrow street.

Just a single vine stem growing up the side of a house can offer a lot of shade. In the sherry houses, where this has been the practice for more than 60 years, the leaves from a single vine form a canopy of 60 sq metres.