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by kube-system 2 days ago
Yes, mini-splits are a good retrofit option, and they are efficient as well. They are more work to install than a PTAC, though, so cheap landlords pick PTACs to reduce labor cost.

PTACs are self contained and so they don't even require an HVAC technician to install. Simply knock a hole in a wall and plug it in. They are basically a permanent version of a window AC unit.