The first thing you should do is to change the attitude about not spending any money,i realize that not everybody has the same resources but you need to think in terms of what conditions your plants will thrive in,not what conditions you can make happen with what you have on hand.
Second,any peice of equipment that you presently own or will add later onn should be tested & any isseus like heat should be measured & doccumented before even thinking about installing it in your room.
Heres my advice,get the ballast out of the grow room,it can be done even if it requires drilling or cutting a hole in the wall large enough to fit the power cord through,this will knock atleast 5 degrees off your temps.
Next you need proper ventilation,you must have a way for fresh cool air to be drawn into the room & a way for hot stale air to be pushed out,fresh air should come from floor level & hot air pumped out at ceiling level.
At the bare minimum you are going to need to install an exhaust fan to vent out heat,if the exhaust fan is pushing enough CFM then in such a small space you might be able to get by with just the powered exhaust & install a passive air intake at floor level.
Watch the seeymorebuds video & see how he takes care of ventilation issues to get ideas of how to set up your exhaust/intakes,he streesses many times in his video the importance of air circulation for just such reasons,if your having heat issues now while its cooler outside wait till july when its hot as hell.
You need to correct this issue asap with the right equipment.
