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"This category [science fiction] excludes rocket ships that make U-turns, serpent men of Neptune that lust after human maidens, and stories by authors who flunked their Boy Scout merit badge tests in descriptive astronomy."
- Robert Heinlein

Heat-Suit  
  Perfect for those incredibly hot planets with breathable atmospheres.  

“How, ’Letha,” called the rider on the caterwheel steed. “Either dress for the climate or put on a heat-suit before you come out of there!”

Aletha chuckled. Bordman heard a stirring behind him. Then Aletha climbed to the exit port and swung out. Bordman heard a dour muttering from the engineer. Then he saw her greeting her cousin. She had slipped out of the conventionalized Amerind outfit to which Bordman was accustomed. Now she was clad as Anglo-Saxon girls dressed for beaches on the cool-temperature planets.

For a moment Bordman thought of sunstroke, with his own eyes dazzled by the still-partly-filtered sunlight. But Aletha’s Amerind coloring was perfectly suited to sunshine even of this intensity. Wind blowing upon her body would cool her skin. Her thick, straight black hair was at least as good protection against sunstroke as a heat-helmet. She might feel hot, but she would be perfectly safe. She wouldn’t even sunburn. But he, Bordman——

He grimly stripped to underwear and put on the heat-suit from his bag. He filled its canteens from the boat’s water tank. He turned on the tiny, battery-powered motors. The suit ballooned out. It was intended for short periods of intolerable heat. The motors kept it inflated—away from his skin—and cooled its interior by the evaporation of sweat plus water from its canteen tanks. It was a miniature air-conditioning system for one man, and it should enable him to endure temperatures otherwise lethal to someone with his skin and coloring. But it would use a lot of water.


(Heat-Suit from 'Sand Doom' by Murray Leinster)

He climbed to the exit port and went clumsily down the exterior ladder to the tail fin. He adjusted his goggles. He went over to the chattering young Indians, young man and girl. He held out his gloved hand.

Technovelgy from Sand Doom, by Murray Leinster.
Published by Astounding Science Fiction in 1955
Additional resources -

A few more details:

Dr. Chuka adjusted a small metal object in his hand. It had a tube dangling from it. He climbed into the cargo space and fastened it to one of the two tanks previously loaded.

“For you,” he told Bordman. “Those tanks are full of compressed air at rather high pressure—a couple of thousand pounds. Here’s a reduction-valve with an adiabatic expansion feature, to supply extra air to your heat-suit. It will be pretty cold, expanding from so high a pressure. Bring down the temperature a little more.”

Compare to the commuter cooling unit from The Three Stigmata of Palmer Eldritch (1965 by Philip K. Dick.

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Additional resources:
  More Ideas and Technology from Sand Doom
  More Ideas and Technology by Murray Leinster
  Tech news articles related to Sand Doom
  Tech news articles related to works by Murray Leinster

Heat-Suit-related news articles:
  - A Forced Air-Cooled Jacket?

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