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PIC 16F84A does not have timer1 peripherical, just timer0. In order to get one hour is better to implement delays decrementing a variable and then, multiply these short delay with nested loops. Maybe you will run out of memory with the 16F84A
DTH22 is a decent sensor for those who are starting with microcontrollers and sensors, I used it a lot because is also cheap and very easy to implement
Delays should be at the end of routines such as I2CRead() or I2CSend, a Delay_ms(20) should work, but, as everyone as stated you should debug your code on the real system and then figure out if those delays worked
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