In general the thermostat will not control propane usage as stated by others. However it is a switch that is closed until the inside temp at the thermostat is at the set number of degrees. Do you have another thermometer to see if the set temp is close the the actual temp. Does the new thermometer make it too warm? was the old thermostat not keeping the room consistently warm. If so you can be using more fuel, just because its now running longer or more frequently to provide the room temp you set it too.
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