If you are looking for help creating a massive convoluted do-all in one logic mess, count me out. The correct way is to create the display function that looks at the variables to be shown perhaps every second and have that function only deal with the display.
Then have a function that ONLY deals with your keypad input and nothing else, no display, no temp, no nothing else. Get that to work so the variables will have the values for your display function to show.
Same with the temperature measuring function. Same with the power control function.
Tie them all together with the loop() function and you have a program is is 99% tested already.
Paul
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