Okay I didn't read the whole thread so I am likely missing some parameters.
What's your total Watts? In each space? Goals?
In summer, put as much of your grow as you can in your basement. It always helps. If you have to choose, put the bloom in the basement; the veg can handle the heat better.
If you are growing at any kind of scale, the options I can offer grow exponentially.
I should of rephrased a bit. I have issues that I solved but they throw curve balls. So if I heat my veg area I may lose the ability to hold a 25gal reservoir dtw coco. Its a legit issue with my biome etc I solved by just swapping 5 gal buckets with new solution but same pump and lid.
Its gone in 24hrs each bucket each plant. So no chance of rot its as clean as can be. I will have 6 plants max so 6 buckets refilled every morning. Its tedious but for 32oz Im game.
So I think Il leave the veg area be so I can at least have that last a week before refilling. Also grows slower clones which can help as idk about you but I never have a smooth lineup. Chopping early is common.
I tried exausting outside and may try that again but it will warm up house. Maybe ok if its mild outside since thats the problem. Flower room will get too hot is still an issue but might get by but may lose terps. Terps are crucial for good rosin.
Maybe turn the fan on in the hvac system? Maybe dim lights to 50%. I already have the curcuit fully used 80% of 15amps. Only thing not grow related is tv and console I run a lead for since its temperary.
So if I get a minisplit it needs its own circuit or plugged in in like one room downstairs that doesnt have a lot plugged in. I already perpetuate light schedules for the amps but could use to my advantage. I do 9/15 at that.
My grow is pretty symmetrical. 3 tents on during day 450w max brightness and same with 3 more tents during the night. 3 plants each side. Two 380w dehueys on 24/7 if a tent or two is too packed otherwise 1 dehuey placed well.
Well idk, the cluttery room of tents had humid spots would be ok if tents not over packed but damn. Just realized my 2.5x5s are small, I want 3x3 or 3x6 or 6x6. Hard to answer without typing too much Im a bit a wild card. But my grow is lol.
Small room is easier to control and I live with people so I have to get what ever I can take. It has its perks I can go on about like bath tub faucet near by that makes filling water quick/easy. If 1500w heater cant raise temps in basement a single lick, I think rh will suffer.
Goals are 25 to 30oz per 10 wks perpetual to all flower rosin its my thing. 125 to 150gs flower rosin dab 40gs save 80 to 100 gs and maybe just grow only during the right seasons probably winter. Look for new gems just keep my equipment and self active.