As of 2016, thermostat user manuals are available online. ManualsOnline.com and ManualsLib.com are examples of websites that provide thermostat manuals of various manufacturers for free. Thermostat manuals are also available from most manufacturers' official websites.
To get the right manual on ManualsOnline.com, type the manufacturer and exact model number of the thermostat in the search bar. The site then opens a new page containing the specific guide if it is available. Click on the manual to proceed to download. Thermostat user manuals provide information about the devices and also help in troubleshooting. Currently, there are over 10 manufacturers of thermostats worldwide.