I think your situation is probably pretty unique. I doubt there are many people out there that have their house warmer than the ideal incubating temps. I think you are fine though. I would start to worry if you got over 92 or so, but I think 90-91 will be fine until the heat wave passes. I lost power down here in FL for a week during hurricanes a few years back but I was lucky to not have any eggs incubating at the time. That was a miserable week though. Trying to sleep was the worst. Good luck. I hope things get back to normal for you soon.
I also would recommend a widow unit A/C. Small ones are really cheap (at least in the states). It would keep your eggs a bit cooler and may keep you from going insane from the heat.![]()