Unable to exercise- how many calories is too low to lose weight?

28F, 5ft7.5, 77kg (170lbs).

It is extremely hot in my country at the moment and I dont deal well with heat, often almost collapsing when i go outside for prolonged periods of time. As a result, i can't go out running as i usually would. In addition, I would never go running at night due to my rational fear of my local area. The only exercise i can do is sit ups or step-ups inside. Squats are not good because I have a bad knee- I can usually do about 10 before it really starts to hurt.

I want to lose weight and certainly don't want to add more blubber to my frame, so how many calories would be good to consume each day to help me lose weight with this limited exercise?

submitted by /u/Thats_My_Moo
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