Getting back to air conditioning: an AC unit is fundamentally a refrigerator for a living space. In (let's say) 1915, nearly all mechanical refrigeration was ammonia-based and was therefore industrial in nature (ice plants; ice cream manufacture). A few other gases such as sulfur dioxide would come into play in time (SO₂ was the refrigerant in the early "monitor" refrigerators), but until the advent of the various artificial, fluorinated organic refrigerants, one had to deal with a gas that is outright poisonous (ammonia), very noxious and hazardous (sulfur dioxide) or extremely flammable (propane). None of those are anything the average homeowner would really want around too much.
Then there's the concept of ductwork: remember that most heating systems in that day were low pressure steam as opposed to hot air--and any hot air systems were gravity-based (that is, natural convection) as opposed to forced, which is necessary for efficient AC.
All in all, the technology wasn't really there until the 1930s or so. Recall, if you will, that movie theaters advertised their air conditioning in those days as a come-on for summer attendance. And the first automobile to be air-conditioned was a one-off, somewhat jerry-rigged sedan modified by a Houston (where else?) doctor, I believe, in 1930. That unit needed its own small lawnmower-sized gasoline engine, and effectively eliminated his trunk space. Automotive AC wouldn't become more or less commonplace until the late 1940s--and even then was confined largely to Packards and Cadillacs sold in the Gulf Coast states and the southwest.