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Many people ask about the capacity of our portable evaporative coolers as compared to air conditioning units, perhaps this will be of assistance:
Estimation of Performance of Air Conditioners versus Evaporative Coolers
Based on design conditions for air conditioners of 80°F db and 67°F wb
Approximate Loads
Unit BTUh Sensible Latent Design Airflow
20-ton AC 240,000 171,500 57,200 6,350 cfm (est)
5-ton AC 60,000 42,700 14,200 1,580 cfm
3.25-ton AC 39,000 28,600 9,500 1,060 cfm
2.167-ton AC 26,000 19,100 6,400 708 cfm
1.5-ton AC 18,000 14,300 4,800 530 cfm
0.83-ton AC 10,000 7,200 2,400 265 cfm
PAC36 EC 97,050 97,050 na 9,600 cfm
TwistAire EC 54,540 54,540 na 5,000 cfm
Since Evaporative Cooling uses only 100% outside air the equipment does not have the component of latent load that the AC equipment must satisfy.
Comparing the EC capacity to the AC sensible capacity only:
 | Port-A-Cool 36" (9,600 cfm) would be equivalent to a 10 ton AC unit at 80/67 conditions. |
| TwistAire (5,000 cfm) would be equivalent to a 6 ton AC unit at 80/67 conditions. |
Evaporative cooling equipment’s efficiency remains constant in different climatic conditions, however the actual degrees of cooling provided will increase as the difference between the dry bulb and wet bulb temperature increases. For example, in this 80/67 condition, EC produces 9.4 to 10.1°F of cooling, in Las Vegas at conditions of 106/66 EC produces 29 to 31.5°F of cooling which means a higher sensible load capacity.