That's exactly what I'm thinkin about doing. I'm gonna share my thinking before yawll tell me how nuts I am.

First off I run a sealed room and basically have a co2 burner(hot water heater). I have heat issues no matter the time of day or year. Obviously they compound somewhat during the summer. Just so we are clear it's the flower room we're talking about here.

I have installed 2 central air vents last summer and there is a portable down there. Last summer I ran the lights at night like 11 pm to 11 am trying to beat the heat of the day. But what happened is the room got so hot at night that I had to run the central air full time, all night long. Now there are nights here where you need the air running but it will usually shut down some. In that scenario I had the air going full blast 24/7. At night to cool the room and in the day to cool me.

Just recently I have done one other thing. The veg room was getting to warm to clone and also to run the aero veg machine. Rather than run a small chiller for the cloners and a big chiller for the machine. I opted to buy the largest 110 window air available. The veg room is 10 x 12. That window air will chill the shit outta that room. Sooooo, I took some ducting and ran it to the window ac. Ran the duct into the flower room and connected it to a 6 in" in-line fan, like a Can fan.(this really helped.

My thinking is these ac's all will run more during the day why not have them lights come on in the day time. Then there will be many nights that the air will shut down at least for a while and sometimes for extended time. Does this shit I been typin make any sense to anybody other than me????

Where I live I run my days as nights and nights as day for flower room. I understand your thinking but my lights do not come on til 8 pm and thus skip the hottest parts of the day. Why? Electricity is at a premium in pricing here during the heat of the day and if there is going to be an overload blackout, it will be mid afternoon. Therefore I am dark during that time, saves me $$$ and possible problems.

Saving juice is one of the reasons I'm making the switch Dawg. My central ac shuts off quite often at night. But if I run my lights at night I have to crank the ac down and force it to run through the night. I don't see the need to have my house at 68 degrees while I'm sleeping. I'm gonna give this a go and see if there is a difference in my bill. I'm gonna settle in at 4am-4pm or 5 to 5. Not sure which one yet.

dont you grow in the basement Nuto?

day or might should not matter to much below the frezze line

I can't believe they price energy differently depending on the time of day!?? Glad I live where I do, I guess? I too switched from 8pm to 8am to 8am to 8pm because of the same issue.

My main reason for changing to daytime was safety. I would rather be awake if anything fucks up or catches fire. Just me but I sleep like a dead man, nothing wakes me.

By 10pm or so my a/c is cycling like normal and I do believe that I save a little.

Its worth a try, your up that early anyways.

why not run the lights at night and use the window A/C to cool everything this will be cheaper then running the central air in your house this is what i do and i can use just a small 5000btu a/c to cool the room with and it is a 6x8 foot room

Nutogrow, you say you're running a sealed room with co2 burner, but how on earth are you doing that if that room is connected to your central ac? Your co2 is being pulled out of the room every time the ac comes on? Then every time that happens, the controller kicks the burner back on, producing way more heat? So you're adding co2 to your house, and making all your systems fight each other? Not to mention, how does your house possibly not reek like weed? And, not to mention, if you have an exhaust fan with a carbon filter to keep the room at a slight vacuum, it's just pulling fresh air in through your ac vents, also making the co2 and ac run more. Same thing if you have a single hose portable ac, those things are a fail on the drawing board.

I recommend you truely seal the room, so when the exhaust fan is on, it pulls the door shut, even when turned all the way down, like with a dimmer. That's how mine is. Then run a mini split AC with modern electronics, that should cut your operating cost tremendously. You can further save by running the room at night.

My biggest reason for running lights at night was for cooler air intake. I never used AC, I just ran a light cooling/carbon filtered exhaust line to outdoors and a dust filtered intake from outdoors.

In your situation Nuto, I think you are on the right track. Since you are not using the outside air to cool the room I imagine it will be the same temperature with the lights on no matter what time of day, therefore if you don't run lights at night the AC won't have to be running 24/7 to cool the heat of the day and the lights at night.

No, he is not on the right track! The room needs to be truely sealed, separate from the house, with its own AC system, so the co2 burner and AC aren't fighting each other. Another window AC, or a modified (internally sealed with expanding foam, tape, etc) dual hose portable AC would work, if the mini split is too much $$.

May not be on the right track. But it sure is workin like a dream. been able to keep the room in the upper 80's and the veg room right at 70 and the living area at 72. And I do have a dual hose portable in there already. I may run a lil bit bigger room than some. Looked into mini splits and that woulda been the next step but I don't think I'm gonna need it.