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I live in a split ranch (3 levels.) An oil furnace with 2 heating zones was installed when the house was built some 50 years ago. One thermostat is located on the lowest floor supplying heat to that level and the second floor living room, the other in an upper floor bedroom in the center of the hallway maintaining the kitchen-dining area and remaining bedrooms. The coldest bedroom is over the garage but is not where the thermostat is located. What determines where a contractor locates a thermostat?
Interpret how I say it, not how you think it.