help, apartment is 85°F with A/C!

hi folks! posting this on behalf of a friend who doesn't have reddit, let's call them K.

my friend K lives in an attic apartment that they moved into around a year ago. in their living room, the temperature is currently 85°F (29.4°C) with a window A/C unit (hisense portable unit, the kind with a hose) and a box fan running. this is the coolest area in their apartment right now, as the kitchen and bathroom regularly reach temperatures of 95°F (35°C). their bedroom reaches temperatures similar to those in the living room, and it has a frigidaire A/C unit in the window.

by all accounts, K is doing everything right. they have windows in the living room, bathroom, and bedroom, which they open at night and keep closed during the day. the window placement is less than ideal for an attic, with them sitting quite close to the ground and at the "back" of all rooms. their blinds are almost never open. they have recently cleaned the filters on all of their A/C units. despite all of this, their apartment is untenably hot.

their landlord and the landlord's maintenance team have not offered any solutions beyond what has already been tried (blinds, windows, A/C filter cleaning). K renewed their lease and must stay in this apartment for another year. there is no clause in their lease about maximum apartment temperatures in the warmer months. what can K do? their quality of life has suffered massively during this heatwave, and they have a longhair cat who is coping well enough but clearly not enjoying the temperatures. does K have any legal recourse? if there was to be more maintenance done to help with the heat, what could it be?

thank you all in advance!! i'm happy to answer any questions in the comments.