Those magical days when the HVAC is off

Some great ideas given! 

I had planned to wrap my upstairs air handler in soundproofing blankets and I bought Dynamat to line the inside of my air handler access wood door. But at the lower air grille intake/electrostatic 23.5"x23.5" air filter is where the majority of the noise is generated. I turned down my handler's pull power but still. About 30db. I don't know how to mitigate that.

I like the simple idea of pre-chilling the house before any serious music playing. My house is concrete bricks so the helps with temperature regulation. 

This is an interesting thread.  We also are enjoying cooler weather in Chicago and yes it does sound like my system has kicked it up a notch.  My house is is 110 years old and my listening room is in the upstairs which is routinely 10 degrees warmer than the lower levels.   The tubed equipment in the listening room also pumps out heat which makes me further crank the ceiling fanI tend to listen to my HT system in the basement in July and August for that reason but it’s great to be fully enjoying the main system with the window open!

In my house of stereo, I use a whisper quiet in wall AC/heat unit. Since the construction is ultra insulated, all I usually ever use it is on the dry setting. I can't hear it even with music off. Meaning I enjoy comfort and ultimate sound no matter what the outside temp is. And I'm around Austin, Texas, no relief from heat yet, 103. It did cost a lot to build the house of stereo though. Like the saying goes, you get what you pay for.

Not going to argue whether or not a system sounds better without the AC/furnace running , but it would seem that sitting in an uncomfortable room as the temp rises would create a distraction in an of itself from enjoying the music. I live in a suburb of Memphis and it has been hot as hell and humid here the majority of the summer, I’ll take the AC with the music and deal with whatever the marginal listening impact, if any, there is.

@rock-on amazing comments you have.

Also incredibly disturbing to hear is Leaf blowers and revving of such, being used during the summer all over the place even though there’s no leaves. Very important to remove every single piece of grass on a sidewalk so it’s not too cause something unslightly.

Leaf blower use causes environmental issues where birds are less frequent in areas where use of Leaf blower use proliferates. Which is just about everywhere. Also pollen count kicks up with all the blowing in the bushes for those who have those types of problems. And it also damages hearing because it’s really really loud for those being outside.