The recommended temperature range for T-58 is 15 to 24c, so 24 is really at the high end (and if you are using a thermometer on the side of your fermentation vessel, it is possible that the beer inside can be a couple degrees warmer yet.)
I've heard that US-05 is a very clean-tasting yeast, so it is possible that it handled a bit warmer temp without off-flavors, but at similar temps the T-58 gives some not-so-great flavors. I do know that in the 20-24 c range, T-58 gives a spicy, slightly warm (alcohol) flavor, I don't know what 26 or 28 would do.
Check around here on the forum, there's plenty of people that have dealt with issues of keeping fermentation cool, and I've seen some innovative solutions (wet shirt over the bucket, making a foam box for the fermenter, etc), I'm sure one or more of them could help you out. Droppinggr the temperature down even a couple degrees might make the difference for that yeast.