these plants can handle more than you think,i run with a 2x4x5 tent,2/300 watt led,1 fan and 1 400cfm exhaust and filter,day heat running at 99 to 106 outside,adverage is 87 in tent at night with no ac,or heat other than light in what is called winter in these parts,main thing is air exchange,match what coming in and out,if you are in a room and your house is air conditioned,that exchange is a hell of a lot better than running in a utility room to the outside,aint no way i would run co2 in the house unless it was for sure a sealed room,if what i described above is fact,the co2 is already there,every time you open a door or window the draft alone exchange it,if your room has a ceiling fan,run it and just crack a window about a inch,co2 issue done,even better is a draft from that room that filter threw whole house,i ran and breed 2 plants last year in the sun with blistering heats outdoors,and threw hurricane and all still had a awesome run,yes the plant will shut down a bit in the heat,but keep in mind under those circumstances,the plant might shut down a bit during daylight hours,but most every plant does it nutrient uptake in the dark,in daylight it is transpiring to off set that damn thing in the sky,lmao,you dont believe this,just wait till you get really hot there,and wait till some outdoor plants are stressed out from heat,water them and watch what happens over night,try a squash plant,they are the best to do this with,what you seen the day before as stress will be flowers come morning and i swear if they get rained on you will have fruit to pick in the morning,all said it isnt impossible to grow them in heat,i do and have been for a year in the tent,outside the offset is the long days and cool nights