I lease an apt in Texas and put a window a?
This depends on the terms of the lease and/or the laws of your state. Generally, window air conditioners that plug into a standard wall outlet are considered to be a portable consumer appliance, like a toaster or a counter-top microwave. Thus, they would belong to the tenant as the tenant's personal property, just like furniture. However, if the window A/C has been installed into the window frame with screws or bolts, or wired directly to the circuit breaker panel, it could be considered a permanent installation that would belong to the landlord upon installation and remain with the unit. It is generally legal to have different lease terms and/or uneven enforcement of the lease terms for different tenants of the same building or complex.