Lighting plus induced cooling energy savings calculator

Combined lighting and cooling electricity saving is calculated as ΔE_light × (1+1/COP). Use the stated system boundary and matching input units.

{\Delta E_{\text{total}}} = {\Delta E_{\text{light}}} \times \left(1 + \frac{1}{\mathrm{COP}}\right)

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

{\Delta E_{\text{total}}} = 100 \times \left(1 + \frac{1}{0.8}\right) = 225

Symbol	Meaning	Unit
${\Delta E_{\text{total}}}$	combined lighting and cooling electricity saving	kWh
${\Delta E_{\text{light}}}$	indoor lighting saving during cooling operation	kWh
$\mathrm{COP}$	cooling coefficient of performance	—

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.