Enter the temperature of the outside air, temperature of the return air, and the percentage of each by volume into the calculator to determine the mixed air temperature.

## Mixed Air Temperature Formula

The following formula can be used to calculate a mixed air temperature.

Tm = To * %OA + Tr * $RA

- Where Tm is the mixed temperature
- To is the outside air temperature
- Tr is the return air temperature
- %OA is the percentage of outside air by volume
- %RA is the percentage of return air by volume

## Mixed Air Temperature Definition

Mixed air temperature is defined as the temperature of two different temperature bodies of air after they have reach equilibrium.

## Mixed Air Temperature Example

How to calculate mixed air?

**First, determine the temperature of the outside and return air.**Measure the temperatures of the two different volumes of air in the system.

**Next, determine the percentage of volume of the first air.**Determine the total percentage of volume of the outside air.

**Next, determine the percentage of volume of the second air.**Determine the total percentage of the volume of the return air.

**Finally, calculate the mixed air temperature.**Use the equation above to calculate the mixed air temperature.

## FAQ

**What is a mixed air temperature?**

A mixed air temperature is the expected temperature of the combination of two different bodies of air after they have combined and reached equilibrium.