On Nov 29, 3:13 pm, "prestocat" u39478@uwe wrote:
Hello. I have 2 seperate furnaces, a wood burner and fuel oil, that are
controlled with 2 seperate thermostats. I was wondering if there are any
companies that sell a thermostat that can control both furnaces? I want to
be able to set the wood burner at 70 degrees, and the set the fuel oil at 67
degrees. That way if the wood burner runs out of wood or goes out, the fuel
oil will kick on and keep the house from getting too cold. If there aren't
any companies that sell this type of thermostat, does anyone know if and how
you can modify a regular digital thermostat? If anyone can please help, I
would greatly appreciate it! TIA!!!!!

You need a thermostat with two set points. .
try http://www.thermostatshop.com/index.shtml
or just call:
ThermostatShop.com
751 Laurel Street
Suite 345
San Carlos, CA 94070
Phone: 650-591-2621 or Toll Free: 1-877-RUN-HVAC
Fax: 1-650 585-5478