Daily Halacha - Shabbat Laws, 20 Iyar 5777

Is it permissible to remain in a room where Shabbat was desecrated by turning on lights or air conditioning?

If a person who doesn't observe Torah and mitzvot turned on the light in a room or a tape player for their own use, there is no need to leave the room, since one does not intend to benefit from the light or the tape player [Yabia Omer 10, 34].

Is it permissible to pour hot water from a heating urn onto tea leaves?

It is forbidden to pour hot water from a primary vessel onto tea leaves. Therefore, the correct approach is to brew them before Shabbat, and if the water runs out on Shabbat, it would be permissible to pour more onto them [Chazon Ovadia 4, 326].

Courtesy of Daily Halacha - Only Good and Kindness