Sum values to display total (running total)

I apologize for posting such a rudimentary question but I haven't been able to find an answer by searching the forum.
Basically, I have several sensor inputs that are all factored into an equation that yeilds heat output (btu/hour). I need to take this value, which I have iterating once every second, and add it to itself every time it increments. In other words, say the first value is 10 (btus), the next second the value is 16, the code calculates and displays a value of 26 on the front panel and waits for the next second (or whatever iteration I choose) at which time it will add the new value to the running total.
Thanks for your input
Jake 
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