for temporary use , you could wire up a dimmer switch to a heat pad. better than nothing. you have to adjust the dimmer and check temps with a thermometer alot. this would be a last resort, stats like ranco,johnsons controls, helix and herpstat are better. can you get a window ac for the house/room? a small 5000 btu 120 volt model should run you less than 100 bucks.
vaughn