Vīrya वीर्य means “energy”.
Vīrya is the heat or cold that the infusion creates in your body.
Indeed, although your infusion is hot in temperature, it may create hot or cold sensations.
Thus, Vīrya can be hot, cold or balanced.
Here is the list of infusions and their Virya:
Kala Pushpa: hot.
Rakta Pushpa: cold.
Nava Vasanta: cold.
Hima Paka: cold.