It’s the middle of winter and your furnace is not working. What are you supposed to do? If you have a forced air heating system, the furnace or heat pump will be the heart of it. These different kinds of furnaces are usually reliable, but they also can break down. It is important to learn how to repair it when something is going wrong. With a little experience and proper guidance, you may well fix several furnace issues all by yourself. First of all, vacuum the area around the blower once a year. If you can, slide out the fan unit, and clean and vacuum it. If you suspect a gas leak, take care of it immediately. If the propane gas odor is strong, immediately evacuate your home and leave the door open. Turn off the gas valve, then call your utility company. If your furnace is older, it probably has a pilot light. If the light will not stay lit, the pilot orifice may be clogged. You should be in a position to clear it with a thin piece of wire, but before you accomplish this, turn off the gas to the furnace. Also, shut off the switch that controls the power to the furnace. If your furnace is supplying some heat, but not enough, be sure nothing is blocking the flow of air. Make sure that the thermostat is set properly. Make certain the registers are open. Clean or replace the air filter. A dirty filter will lower your unit’s efficiency. By troubleshooting and doing all your own repairs, you will save money and find your home heated up much more quickly than if you must schedule and wait for an HVAC repair person.