Troubleshoot your furnace before calling a professional. If your furnace does not seem to be working correctly, here are some troubleshooting tips. *Be sure nothing is blocking the air flow at the registers and are the registers open? *Is the thermostat set to the correct setting-heating? Is the fan on? *Does your thermostat take batteries and if it does-do you need to install new ones? *Is the air filter dirty? A dirty air filter can impede proper operation of the furnace *Check the circuit breaker if your furnace is not working *Be sure the furnace power switch is on. Look for the switch next to or inside the furnace cabinet *If you have a gas furnace, is the pilot light out? If your furnace is still malfunctioning after these simple troubleshooting steps, it is time to call a professional. De Hart Plumbing Heating and Cooling, serving Manhattan Kansas, Junction City Kansas, Wamego Kansas and some surrounding areas.