You can take matcha as you like, both hot or cold. The benefits of taking matcha are not altered by the temperature at which it is drunk.
We recommend that you try making matcha with hot water or milk and then pour it into an ice glass to take it cold.
If you want to know how to prepare matcha tea I will teach you about it and also with various variants.
Since it is a delicious warm tea but it can also be taken cold in the hottest months and also lends itself to be taken with or without milk, which would be the famous matcha latte.