I guess that brick age people l gained from the critters around them how best to keep moderate in cold weather, then staying moderate was straight-forward even before fire because they noticed how an critter’s fur became thicker as the cold weather approached.
With no PETA to intervene, they became the first to wear fur coats.
Staying cool proved to be more difficult. They got little help from the critters, but prehistoric pets really irked housekeepers of the morning by shedding fur in the cave but the real fear was the approaching tepid weather. Panting only worked for dogs and wolves and even early humans could only spend a short time wallowing in a cool pond or wallowing in a mud puddle! From those nights until the 20th century all humans could do was find shade, fan themselves, or sit next to a big block of ice which was impractical for all the people, every one of us will never be able to prove if critters helped present-day homo-sapiens with the development of Heating & Air Conditioning. Thanks to fire, oil furnaces have been around for many centuries; But there is not 1 critter that can offer advice on the thermodynamic cycle of new air-conditioning. The only critter help may have come from the prairie dog and their ventilation techniques. They build several holes in their burrows at odd heights. When a breeze blows across the land above the burrows, it moves slightly faster over the elevated holes resulting in a pressure differential that sucks the stale air away from inside the burrow. Prairie dog ancestors date to the Pliocene Epoch, approximately 2.5 to 5 million years ago, way before the first ammonia-based refrigerants were discovered that led to the central Heating & Air Conditioning systems of today’s new burrows.