What is the air temperature rise when return air is 66°F and supply air is 115°F?

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The air temperature rise is the difference between the air leaving the system (supply) and the air entering the system (return). So you subtract the return temperature from the supply temperature: 115°F minus 66°F equals 49°F. This shows the air is heated as it passes through the system.

The other numbers don’t fit because they don’t match the actual difference between 115°F and 66°F.