Not sure about the parent post, but my lease also has a similar restriction. In my case, it's just re-asserting a restriction passed through via an HOA covenant

Not sure about the parent post, but my lease also has a similar restriction. In my case, it's just re-asserting a restriction passed through via an HOA covenant[1]. But I'd also restrict it as a landlord. An improperly installed window unit can easily lead to water damage through improper sealing or installation, can stress the window frame if it isn't braced appropriately, and be a major falling hazard if installed on upper floors. Not that it takes advanced skills to avoid most of those potential problems. But there's a reason many apartment complexes nowadays deadbolt utility closets and require maintenance calls for something as mundane as periodically changing out air filters[2]. Making any presumption about the sensibility and competencies of your tenants is a recipe for costly disasters. [1] https://www.nolo.com/legal-encyclopedia/what-the-difference-between-association-bylaws-ccrs-hoas.html https://www.nolo.com/legal-encyclopedia/what-the-difference-... [2] For those less familiar with HVAC units, there are one or more air intakes somewhere in the house. Inside the air intake is a filter that traps dust and other particulates so they don't recirculate through the house. These filters get clogged up over time and need changed out every 1-3 months.