RIP 20 Year old AC

Our upstairs A/C unit is officially dead. Certainly it was impressive that it apparently lasted for 20 years - it was original as far as I know (as is the downstairs one which is still running, knock on wood). They are both Carriers, so I guess kudos to Carrier for making an A/C that lasts 20 years. But anyway, it's time is apparently up :) Our home warranty company is paying a few hundred dollars for the coil , which is the thing actually broken, but it's not possible to replace the coil on a 20 year old A/C apparently and have it actually be like, up to code. So we have to shell out for the compressor, so we elected to go with a slightly larger one (2.5 tons instead of the 2 ton we had) and also to replace the furnace at the same time, both with Lennox brand models. This will enable us to claim a $425 rebate from the electric company due to it meeting a certain standard of energy efficiency, apparently. Still, the net outlay of cash on our part is north of 5k :( And also, the install isn't scheduled until a week from today, so yet another week with no A/C upstairs. Fortunately it's been overcast and low 80s mostly, so not horrible, but our window screens are also all 20 years old and most are broken so the only person who has a window screen / window fan right now is Ben and the girls have been sleeping in the bonus room with a portable A/C unit in there. But that's getting old as they claim they can't share a king sized bed without kicking each other. Sigh.