Attic Fan Thermostat Replacement
Trying to replace the thermostat on the attic fan in our attic. I know I have to turn the power off in switchboard located in basement. there are two boxes near the fan. One is medium size circular box and other is rectangle smaller box. I had one of those free estimates guys come in and look at that thermostat and he said i need to replace the thermostat and he took out the small rectangular box and handed it over to me (by the way this has two black wires coming out). He said 350 dollars for changing so I said no thank you to him and let him go. Help from you guys can save me this money. I know thermostats are cheap at may be 20-30 bucks so I have opportunity to save some money for my son's PS3 need here. Any help with diagrams appreciated. I will shut power off dont worry. To give you backgroud, there is fan already installed and two boxes as stated above. also there is on/off switch wired in. so literally i just have to change the thermostat. let me know guys. thanks.