Temperature problems

Hi guys, well i started to grow.. grown 1 time in diy box and it went alright for conditions.. i made some upgrades put a carbon filter with tt150 with termal control put one small 45w 100mm for sucking air from top, one circular fan and 1 tt100 for fresh air, the ducking for each is arround 5-6meters to the window.. box is 160x180(height)x80 if i told right.. i live in a house with 3 floors and ofcourse i am on top.. how much temperature is outside i get 2-3celsius less in the box, its very close to the roof and the sun heats roof very well.. i don't have money for the AC yet, but is there any chance to bring down temperature more? Cuz in the day i get arround 28-29celsius and thats way to high for the plants.. should i change something in the setup? Positioning of fans? Some trick with something? I am really strugling.. so any help would appriciate.. i am tending to buy a real grow tent and considering bringing it in the 2nd floor of the house in my room, because temp is arround 24celsius which is perfect.. is this a batter way? Because i am "scared" of the smell.. i would try to isolate more tent and but 2 carbon filters on each side and put air refreshner in the room and ONA gel.. will i still have the smell or? Thanks guys for reading.. cheers from Croatia

Right first of all, if you put it in the lower floor which is cooler then you have a better starting point.
If you use a quality filter, preferably over sized and that goes directly outside then you won't have smell other than on harvest days.

Now let's see if I can make sense of your set up.

You have a 150mm filter and tt fan. Need to see a pic of that to determine if it's a bag of bollocks. Or a link . Some of them are not good at pushing air through several meters of ducting!

Then you say you have 1x 100mm 45w for sucking air from top. I don't know what you mean by this.
Your extractor should be the only fan sucking from top.

Then you say you have a 100mm tt for fresh air, so this is your intake?
This also has several meters of ducting attached.

You do not need an intake fan and if you want to use one then you do not need ducting from the window. Either just use passive intake or cut most of the ducting off.
Too much resistance will stop your fans doing their job and if your relying on your intake which isn't overcoming the resistance then your creating a choke point for you whole extraction system.

Now the easiest way in the room it's in now would be to move it closer to the window and keep a line of ducting from your extraction as short and straight as possible.

At the end of the day the more air you exchange the closer to room temp you will be.
If its already too hot move it to a room which isn't.
Makes sure your lights are on durin the night and off during the warmest parts of the day.

You don't mention what lights your using.
All wattage will add some heat so cut out the things you don't need and your temps will lower.

Really would like to see a photo of all components to be of more help

Your high temperatures are fine if using LED.

I figured the problem.. i have too larger box for setup i got.. right now 120x100x180.. the amout of hot air could not got out, ordered 60x60x160, fan flow is 187cmf and my fans are for 120-190cmf and my box has serveral leaks so i guess thats the problem too.. i searched a bit online and asked couple of people and this was the answer.. also my light is viperspectra 450w