Telecom Closet Cooling Calculator
Cooling capacity for a telecom or IDF closet.
Enter your values
ⓘ Live results
Results
- Required cooling
- 0.53 tons
- Heat load with margin
- 6,398 BTU/hr
- Approx supply airflow
- 213 CFM
- Recommended unit
- Ductless mini split, 3/4-1 ton
Quick answer
Telecom closets are sized by summing equipment heat load and adding a safety margin, then converting to tons.
Tons = (equipment W x 3.412 x 1.25) / 12000
How to use the Telecom Closet Cooling Calculator
- 1Add up the wattage of switches, patch panels and UPS units in the closet.
- 2Apply a 20-30% safety margin for future equipment growth.
- 3Convert BTU/hr to tons and pick the next size up cooling unit.
Worked example
Using the values the calculator loads with:
Inputs
- Equipment power draw1500 W
- Safety margin25 %
Results
- Required cooling0.53 tons
- Heat load with margin6,398 BTU/hr
- Approx supply airflow213 CFM
- Recommended unitDuctless mini split, 3/4-1 ton
Frequently asked questions
Can a closet use building HVAC only?
Only if it runs 24/7 independent of occupancy schedules — most IT closets need dedicated cooling.
What temperature should I target?
64-75F is the common ASHRAE recommended range for telecom equipment.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.