I have a Bryant 60k BTU gas furnace(about 6 years old) and no AC. I can manually turn on just the FAN or leave it on AUTO for heating. I have the RITETEMP 6025 thermostat.
At the moment I am cooling the house in the summer by manually turning on the FAN from my gas furnace in combination with some open windows in my livingroom. The livingroom cools down quick from the open windows and the intake for my furnace is in the same room, so it picks up cool air and sends it to all the other rooms.
I do this by turning the fan on at the thermostat and letting it run for about 4 hours or until the bedrooms are cool, then I turn it off manually again, usually around 4AM.
Can I rewire my thermostat in a way I can achieve this automatically? For example, the house is at 85F, I select COOL on my thermostat and set the temp to 78F. The FAN runs until the house cools down to 78F then it stops.
When it gets close to the winter I will rewire for Heating as below. At the moment I have 3 wires connected (G -Fan control, RH - Heater power and W - Heat control)
Here is the link for my thermostat manual: http://www.ritetemp-thermostats.com/60XX/images/6025_installation_guide.pdf