Free (but crappy) Air Conditioning (Score 1)

If you have a forced air furnace and it's located in a basement, you have the the necessary stuff to circulate (somewhat) cooler air. First check to see that the furnace doesn't have air conditioning already. Second, make sure there are no stink sources in that basement. Remove smelly hockey equipment, rotting garbage, etc. Remove the door on the furnace that allows access the insides where the blower motor and fan are located. Somewhere on the frame of the door is a 'push-button' switch that prevents the furnace from operating with the door removed. Wedge this switch so that it is pushed in so that the furnace thinks the door is back on. Set the thermostat to the lowest setting to prevent the burner from turning on. Set the fan switch to 'ON'. ( If there is no fan switch, you will have to hot wire the blower. This is easily accomplished by any nerd by running an extension cord and plug to the blower connector after disconnecting this from the furnace. This should be self evident. ) Now we have the blower running and sucking cooler air from the basement and blowing out the registers! In my house the basement is usually 15 degrees F cooler than the first floor and 20 degrees less than the second floor, however, in Michigan where I live, we also have humid summers. Warm humid air condensing in a cool basement creates dampness and mustyness so a portable de-humidifier is a must. These things, naturally, blow out dryer AND COOLER air. Place this to blow into open furnace for max effect!