no way, u dont need another room at all.
build an incubator. thats what i did. and u dont want 86* thats way too hot. u want closer to 80* 82* is perfect. u have to remember that fungi do generate some heat. so if the container is 82* then its 84* inside the jar. and temps that high will make your chance of growing contaminate increase. jars can colonize no problem at room temperature 75* i guarantee it leave one jar and see for yourself.
the incubator that i built was simple. first get a large heavy duty tote.
and a cabinet organizer shelf. like this one
*click here* u can also find it at lowes
then get a
reptile heating pad and a
reptile thermostat
stick the under the undertank heating pad onto a cookie sheet. and put it in the bottom of the tote pad up, cookie sheet down.
then place the shelf, so that the jars aren't directly on the pad.
place the temp sensor on the shelf, and then your jars on the shelf.
set the thermostat to 80*-82* (86* if you really must but i dont recommend it)
also as a bonus. buy one of those
indoor outdoor wireless thermometer
and place the "outdoor" wireless sensor inside the tote. this way you can double check the accuracy of the thermostat, and u can also then monitor your incubator temps from anywhere in ur house. i put mine on top of the fridge, that way i can see it from almost anywhere. i feel this also helps satisfy the need to constantly check them to see if they are alright. i just check the temp instead. and if its right at 82* i feel better.
good luck! and ive been growing for awhile, and have grown on just about everything. so PM me if u have any questions, or need any advice.