Question

houses in cold countries are Windows with double Glass on walls made up of hollow bricks​

Answer 1

Answer:

In cold countries, due to climate conditions the windows hav double glass as glass is an insulator and it doesn't allow to move any heat which is present in the room and even it doesn't allow to enter the cold weather inside the room/house,thus keeping warm inside.

Explanation:

Answer 2

In colder countries it reduces the energy bill significantly. The cost of lightning is reduced as the glass helps with better natural illumination and also the heating due to green house effect reduces the need for extra heating. These are essentially the same reasons that lead to higher energy consumption in the hotter countries like India. As the sunlight is very hot the curtains and blinds remain perpetually drawn resulting in a need for extra illumination and the green house effect increases the need for higher cooling. The Air Conditioning systems feel inadequate most of the time. It is like living inside a large inefficient Solar Cooker.Read more on Sarthaks.com - https://www.sarthaks.com/330516/houses-colder-countries-have-windows-with-double-glass-walls-made-hollow-bricks-give-reason

Hope it helps