Cooling-degree-day cost calculator

Convert cooling heat to electric energy and divide by COP.

Units

C_{c} = \frac{U \times A \times \mathrm{CDD} \times 24 \times c_{e}}{3412 \times \mathrm{COP}}

Calculator

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

Given

C_{c} = \frac{0.09 \times 4800 \times 1600 \times 24 \times 0.13}{3412 \times 3.2} \approx 197.5

Symbol	Meaning	Unit
$C_{c}$	annual cooling cost	$/yr
$U$	overall conductance	Btu/(h·ft²·°F)
$A$	surface area	ft²
$\mathrm{CDD}$	cooling degree days at the selected base	°F·day/yr
$c_{e}$	electricity price	$/kWh
$\mathrm{COP}$	cooling coefficient of performance	Btu/Btu

Symbol	Meaning	Unit
$C_{c}$	annual cooling cost	$/yr
$U$	overall conductance	W/(m²·K)
$A$	surface area	m²
$\mathrm{CDD}$	cooling degree days at the selected base	K·day/year
$c_{e}$	electricity price	$/kWh
$\mathrm{COP}$	cooling coefficient of performance	ratio

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