Well, last year saw the purchase of a Whynter ARC-14S 14,000BTU A/C to replace a 12,000 BTU unit. In combination with an air recirculator (fan) the front room temps were kept between 75º and 85º on the hottest days. I work from home and the computers are all fine, so this temp was something I could deal with. The summer of 2020 had us at front room temps of 85º to 95º. The main problem is that there is only a small wall between the kitchen and the front room. In it's entirety, the space is too large for the A/C unit. But I only need a specific area kept cool. Any use of the stove is done after 5pm during July and August.
The A/C has a timer and during those months it's set to kick on at 4am. As long as we start cool, we stay cool.
The other rooms all have A/C units that can handle the size so sleeping and activity there is just fine. It results (during July and August) with several hot zones between the front room and the bedrooms, but we aren't hanging out in the hallways.
This was June 18th, 2021.
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PS. The lows are what kill you in August. When the low is 95º at 4am there hasn't been any chance to cool down. That means you start the day with a deficit you have to make up (because the A/C was off at night when no one was downstairs and thus did not keep the room cool).