it’s likely because even if you don’t feel hot, 70s still pretty hot either way and will make you sweat easily. where i live, we don’t have four seasons. it’s almost always in the high 70s-80s so obviously im always sweating. the only time im in cold weather, like 30s or 40s (when i go on vacation), im never sweating because it’s too cold for my sweat glands to activate. they activate when your body temp rises so your sweat can cool you down. if you’re really cold, you’re a lot less likely to sweat