On Tue, 08 May 2018 17:20:00 +0100, Ed Pawlowski wrote:

On 5/8/2018 11:02 AM, Jimmy Wilkinson Knife wrote:

The glass doesn't provide the majority of support, the window sill does
and if it can't handle the weight of an A/C unit you have far bigger
problems. The unit is pretty much balanced there with some force being
taken by the bottom rail in a double hung window. Nothing major if
properly installed.

I'd still be concerned by vibration.

There are millions of them in use. Problems are rare, usually from
homeowner mistakes.

In my experience glass is bloody fragile. It surprises me it doesn't shatter more often.

--
I'm not a vegetarian because I love animals, I'm a vegetarian because I hate plants -- Whitney Brown