Are dehumidifiers effective in hot and humid conditions - about 40 degrees celsius and 80% humidity?

Question

From the month of June to Septmeber the temperatures in north India are around 40 - 45 degrees centigrade and the humidity levels are about 70 - 85%. Would dehumidifiers be effective in these conditions to ease the humidity levels. Air conditioners are useful, but sometimes all one wants to ease the discomfort is to lower the humidity levels. Air conditioning one or two rooms in the house doesn't really help and it also increases the risk of exposure each time you step outside. If dehumidifiers are suitable in such hot and humid conditions - what make and size would be suitable for a room size 20 feet by 15 feet?

Answer 1

This is when they should be *most* effective:
1. Because that is when they are needed.
2. Cold air does not have much moisture, so it is hard to get any more out.

Dehumidifiers work much like air conditioners, except they do not pipe the heat *out* of the room. The dehumidifier will likely make your room *hotter* but it may feel cooler because the air is dryer.

"The operating cost of a dehumidifier is fairly expensive."
http://housing.cce.cornell.edu/f-sht-pdf%20libraries/HOUSING%20F-SHTS/home%20envir-pdfs/dehumidifier.pdf