Satwa flat's old split AC barely copes in summer — service it or replace on these ageing units?

Age alone doesn't condemn a split, but the pattern you're describing is the classic Satwa one: an old unit that's never been properly maintained, not one that's genuinely dead. On an ageing split, the honest test is whether one proper service restores it: a full coil and filter clean, a gas-pressure check (not a blind top-up), and a look at the capacitor and contactor, which are the parts the heat kills first. If it cools well and the current drops after that, it had years left and was just choked. If it still struggles after a genuine service, is low on gas again within a season (a leak), or the compressor is drawing high and short-cycling, that's a unit near the end and you're right to push for replacement rather than keep paying. Get AC repair in Satwa to do the diagnostic first so the decision is based on numbers, not guesswork. In these older blocks the wiring and isolator are worth a glance too, they age alongside the AC.