Makes me wonder if the people who are complaining about loud AC units are doing so partially due to envy. I have heard of this from co-workers; complaining that their neighbour's AC is too loud. However they find it too loud because they have to keep their windows open due to not having AC.
Which brings me to a couple of other side benefits from having AC. Both are due to not having to leave windows open:
- Security. Either from intruders or from changing weather. (Rain, dust, smoke, etc.) Having central AC means you don't have to keep a schedule of opening and closing windows; nor do you have to worry about somebody using an open window to break into your house.
- Noise. In the summer it doesn't bug me if there is noise from traffic or the neighbours having a party. The windows are only open if I feel like having them open.
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