Yeah, those 1Ks heat up a lot. But, with the fan hooked up you'll get that air out pretty good. With the 1K you'll find yourself having the hood higher above the plants than a 600. 85 is pushing the limits unless you're running CO2. Ideal temps are between 72 and 75. I don't think you'll have any problems though if the room is cooled with central air. But, you'll make your central air work much harder and that'll really effect your electric bill.
I'm going to be doing something similar. What I'll be doing is covering the vent to my room and running a portable AC like this...
http://www.homedepot.com/p/LG-Electronics-8-000-BTU-Portable-Air-Conditioner-and-Dehumidifier-Function-with-Remote-Control-48-Pints-Day-LP0814WNR/204684040?keyword=8000 btu portable air conditioner
I'll have the AC in the room and my exhaust fan will bring in that air from the vents on the bottom of the tent. The cool air will then go through the plants up to the filter which is drawing in air from the inline fan. Here's the thing though, the exhaust duct from the portable AC gets really hot. What I did in my last setup with a portable AC is put an insulation sleve on the duct and it isolated the heat really well. Couldn't feel any heat from the exhaust duct at all.
Here's an insulation sleeve...
http://www.homedepot.com/p/Master-Flow-6-in-Diameter-R-6-Ductwork-Insulation-Sleeve-INSLV6/100396953
Pretty cheap at Home Depot. Only $6.45 and it makes the world of difference.
Hope that helps.