Adjusting garb: Halachic minimum in maximal heat

This morning, I did something that I've never done before--I delayed putting on tallit and tefillin until right before the Matbeiach shel Tefillah (required part of the service), putting them on just before the b'rachah (blessing) Yotzer Or ( [Praised is the One] who creates light), and took them off after the Amidah. (According to the notes in the Koren Sacks Siddur [prayer book], the minimum requirement for tefillin, per Jewish religious law/Halachah, is that they must be worn during the Sh'ma biblical quotations and the Amidah prayer.) This enabled me to give Consolidated Edison, our local electric company, a break, as they've been requesting since the heat wave began on Sunday, by delaying turning on the air conditioner and turning it off after less than half an hour. It also kept me from passing out--our living room air conditioner is no match for a wool tallit. The temperature was already 84 degrees Fahrenheit (28.89 Celsius) when I began davvening/praying, and is expected to go up to 90-something (32.22-something Celsius).

The air conditioner won't stay off for long. :(