Summer Heat/Impact on System-Listening

At least in the 'States, we are experiencing a heatwave. The power grid is being taxed by enormous demands, and this must have an impact on the quality of listening. I know we have experienced voltage dips- on my home theatre, one of the power controls shows this, when in normal operation, i never see these indicator lights. ON the hi-fi, I have noticed that the Audiopax amps- which have that unique biasing feature- are less stable in settings. In other words, once the controls are set on the biasing feature, the amps are normally very stable and the settings don't drift. This week, i found that the settings were 'off' several times over a day-long listening session.
What impact does this have on your systems?
Also, we are centrally air-conditioned, but obviously, that contributes some ambient noise to the listening room. I prefer to listen in absolute quiet. How do all of you deal with these issues? No listening during the heavy heat months- listening at night, when power consumption is often lower, and temps are usually cooler- is not an answer when the temps stay hot well through the nite.
Sorry if this seems like an idiotic query. Just curious about the behavior of other listeners given what I've experienced in this heat.