The place that I live in is suffering some heat waves, with outside temperatures reaching 37 degrees Celsius. I live in a house that heats up a bit, possibly reaching temperatures higher (just moved in, don't know the temperature ranges yet) It does not have a thermostat or air conditioning.
I have found plenty of information about safe temperatures outside (eg, https://www.dogtipper.com/heat-stroke-in-dogs, with a nice infographic) but I am looking for safe temperatures indoors.
My dog is 27.5 kg, 9 years old, and is not too active around the house. I provide her with constant water and occasional ice as treats (she likes it). But, of course, general information is also useful and appreciated.