Those magical days when the HVAC is off

"Power Conditioning" is a catchall term that can mean just about anything.  Many will disagree with me, but they are the same people I see arguing because they mean one thing by the term and the other person means something else.  I think of power conditioning as an attempt to filter our the noise and leave the 60hz sine wave intact--a fools errand.  

Power regeneration is the process of rectifying the incoming AC to DC, then inverting it back to a perfect AC 60hz sine wave using a very high quality inverter.  However, they aren't always called that.  PA Audio calls them "power plants" for example.  

So a regenerator is what you need and what I use.  that said, not all components benefit from the regenerated power.  I have very damaged power waveform coming into my home, usually running 2 to 4 % THD.  This isn't caused by my own load, or the load of my neighbors, but by the combined load on the neighborhood 12Kv circuit and perhaps even on the higher voltage transmission line.  

The output of my regenertor has  0.1% THD.  That said, some components seem to sound the same on wall power or regenerated power, because they have an excellent power supply that deals with the imperfect power.

My main complaint about air conditioning is the ambient noise.

Frankly, I think the widespread belief that stereo sounds better at night because the power is cleaner is a myth.  I've checked my power many times in the middle of the night and it is just as dirty (3-4% THD) as in the day time.

Jerry

Night time is the right time.

@carlsbad2 correct. Just turning off AC, what about all the other contaminating electrical devices still running in your home, all of it continuing to contaminate AC. And then think about the entire AC grid, we increasingly live in a 24 hour world, I suspect for vast majority of us, grid contamination pretty much same day or night.

The biggest variable day to night is both home generated and externally generated background noise. Also, I can understand why some dismiss this as cause so easily, many live 24/7 in  high ambient noise level environments, we subconsciously block much of it out. And think about epidemic levels of hearing loss today, likely many of us suffer from it and don't even know it. Not only certain frequencies can suffer, but low level info and micro dynamics simply unheard. Think about how many of us not really hearing full potential of our systems, between ambient noise and hearing loss, could be a lot!. people simply don't know what silence sounds like anymore. Go to an anechoic sound chamber, you'll be freaked how loud just your breathing is.

@sns 100% agree that I think the big difference is background noise, both inside and outside the home.  For a second I thought I was accidentally reading my own post.

Late night is great 'round here. '20's background until MOMA flies over...but somebody's getting saved potentially....  my ambient is low otherwise..

Night temps are drifting down into the '60's. so the AC can get shut down...