Zeedman
Garden Master
If the favas are in pots, they might benefit from wrapping the outside of the pots with aluminum foil, to reflect heat & keep the soil cool(er). Based upon my experiment of mulched vs. unmulched last year, favas are more likely to be damaged by warm soil than warm air.I've decided to take a wait an see monitoring stance. As it happens, the pot of favas is close enough to the dining room window that I can keep an eye on it without actually going outside. At the moment, I'll leave it where it is and just keep watering it. If I see any sign of drooping THEN I'll brave the heat and lug it inside.
And to echo @heirloomgal 's observations, I too found the Crimson Flowered favas to be more heat sensitive. They showed little improvement after mulching, unlike the Black Russian which revived & produced some seed.