What is the temperature difference (ΔT) used to calculate BTU if the EAT is 76° and the LAT is 98°?

To find the temperature difference (ΔT) used to calculate BTU, the formula is simply the difference between the leaving air temperature (LAT) and the entering air temperature (EAT). In this case, the EAT is 76°F and the LAT is 98°F.

Calculating the temperature difference:

ΔT = LAT - EAT

ΔT = 98°F - 76°F

ΔT = 22°F

Thus, the temperature difference is 22°F, which corresponds to the correct answer. Understanding this calculation is crucial because knowing the temperature difference in HVAC systems is essential for determining heating or cooling loads, which in turn affects equipment sizing and efficiency.