Having run a 1000 watt in an even smaller area, getting rid of the heat can definitely be a problem. But there are a variety of things you can do to rid this issue; unfortunetly they all cost money and some are impractical (to much noise, etc).

First and foremost, I am going to assume that your 1000 watt hood is aircooled (meaning that air is pulled from the hood, over the bulb, and exhausted out of the grow room. If not, well then obviously this is your biggest problem. If you are venting the hood already, consider making sure that you are getting the absolute most efficient power out of the fan. This can include taping the glass (painters tape leaves no residue and can handle the heat) and the seems, using 90 degree hard elbows where your ducting makes a turn, and setting up the fan with the least amount of turns and distance from the hood. In my experience, you need about 300cfm to vent a hood well enough to provide major cooling (ie a 4" inline fan or a speed controlled 6").

With a Cooltube hood, you can get even more efficient airflow over the bulb resulting in even cooler temperatures. Consider insulating your hood as well. Are you using a passive intake or an active intake? Where is your intake being drawn? Your not drawing intake from the same place your exhausting are you? Im my experiments, I found it is much more efficient to use 1 single powerful fan to exhaust in conjunction with a "sealed" room. With a 300-500cfm fan pulling air from a small closet, all you need is a passive intake and youll have a LOT of air moving through.

A circulating fan inside the room will move air around and help with circulating, and having the fan pass over the hood will also help cool it (but only with dissipation). Finally, make sure your ballast is outside of the grow room; this is a large source of heat.

Aside from that, some people just dont have a cold enough intake charge so your fighting a loosing battle. You can get a small portable A/C to help this problem, or some ingenuity concerning where to pull the air from. Some of my friends pull air from the cool basement and vent into the already warm attic.

Finally...if you can afford to have 2 fans, you can seal the light from your room which will cool the most. Pull air from outside the room, through ducting, through the hood, and then out ducting to outside the room. This means that all the air cooling the bulb and hood is cooler then the ambient temp inside the grow room. You then will need a seperate exhaust fan to exhaust the room itself. One 300cfm inline fan will exhaust a room much better then a 150cfm squirrel cage intake and a 200cfm squirrel cage exhaust.