The Hous has an open canopy and can get quite hot.
Some of the trout will continue to feed even as the water reaches 75. Many of the Housy holdovers APPEAR to be more heat tolerant and will fight pretty aggresively even when the water is above 70. I have always suggested that people focus on the Bass during the hotter periods and use heavier tippets than normal in case you (or if you intend to) hook trout. Land them quick, take a few moments to revive them, and you'll see that most of the trout that are actively feeding are quite hearty.
The Farmington, on the other hand, only cracks 65 in the hottest of weather and those fish get quite lethargic at those warm temps and will roll belly up if played too long at 65 degrees and released poorly. So the temp thing, as with most rules, is pretty general and should be adjusted for each river.
Catch one of those big bows in the hous when the water is 70 and I'll bet you kill it. (IMHO)
It should go without saying - but of course it won't - if you see fish podding up and gasping when the water is warm, don't try to catch them >![]()