We just moved into a house that has a Honeywell RTH230B thermostat. The house is a two story with the old style heating registars. We have no idea how to use this thermostat or set it appropriately because there was no manual in the house anywhere. Do you have a users manual or know somewhere to get one??

Here is a link to your user manual. It is near the bottom.


Default - Honeywell Environmental And Combustion Controls


Click on the Installation and User Guide and make sure you down load the english version. Have a good day.