When your furnace is turned on, you expect to feel a blast of warmth. The furnace has two venting options: one for heat and one for cooling. When the furnace reaches a certain temperature, an electronic sensor opens the other vent to cool air outside to keep the house comfortable. If you notice that it’s blowing out cold air, there might be a problem. In this post, we will explain why your furnace is blowing cold air.
1. The Filter Is Full
Your furnace’s filter keeps the air clean and removes dust and dirt. But when it gets too dirty, it can prevent your furnace from heating properly. The most common reason for this issue is that the filter is clogged with pet hair, dust, or debris. Check to make sure your filter is clean. If you notice that the airflow isn’t strong enough to push the air through the filter anymore, consider changing it with a new one.
2. The Heat Is Too Low
The furnace’s controls regulate the temperature of the furnace. If it is too cold, there may not be enough heat to reach a certain temperature. The heater might even cause the furnace to overheat and blow cold air. Check the temperature settings on your thermostat, and make sure they are set at a comfortable temperature.
3. The Thermostat Is Off
If your furnace is too cold, its thermostat might be off. The thermostat is set to a certain temperature. If the power comes on but the furnace has not reached the desired temperature, the thermostat will run until it reaches its set point. If you notice that your furnace is constantly blowing cold air despite having a steady flow of hot air, this could mean that your thermostat is at fault.
4. The Fan Is Dirty
The fan inside your furnace is important for airflow. If it becomes dirty, the air filters will clog, causing your furnace to stop heating or cooling repeatedly. You can clean the fan by removing the blower housing and wiping off dirt with a dry cloth. Check to make sure there are no obstructions in front of the fan blades. If not, make sure the blades are clean before reassembling the unit.
5. The Furnace or Heater Is Not Working
Your furnace or heater might be damaged. If it is not working, the parts inside are probably not functional. When you notice that your furnace is blowing cold air, check whether there are any signs of damage to the unit’s interior. There could be a problem with the heating element, blower fan, or motor that runs them.
6. Bad Thermostat
The thermostat is an electronic heat control used in most appliances. It is closely related to the furnace but located at a whole-house level. The thermostat must be working properly for the furnace to function properly and for your home’s temperature to remain comfortable. A faulty thermostat will cause the furnace to run constantly and blow cold air. For furnace repair, maintenance, and installation in Las Vegas, NV, and surrounding areas, contact Polar Air & Heating, Inc. for help. We pride ourselves on providing prompt and courteous service to all of our customers.
7. Blower Is Not Blowing
The blower inside your furnace is responsible for maintaining the airflow, and it is essential for ventilation; therefore, its operation must be of the highest quality. The blower of your furnace is responsible for maintaining airflow throughout the home, and, therefore, it must work properly and not fail to do so. If you notice that your furnace blows cold air despite having a steady flow of hot air, this could be a sign that the blower is not working properly.
8. Furnace Has Overheated
When a furnace overheats, it is no longer able to cool or heat the house anymore. Overheating is a common problem for furnace owners and can be caused by many things, including dust buildup in the system, clogging filters, poor air circulation due to blocked vents, etc. An overheated furnace can cause many problems in addition to blowing cold air. If you suspect that your furnace is overheating, contact a professional to diagnose the problem.
9. Pilot Light or Ignition Problem
Pilot lights and ignition problems can cause your furnace to constantly blow cold air, even when you turn it on. Use a magnet or a long-handled screwdriver to check for any obstructions in the pilot light area. If there is any metal object, replace it. If you find any, replace the switch, and reconnect the wiring properly. The next step is to look at the wires for any signs of breakage or damage. If there are any, replace them immediately.
10. Leaking Air Ducts
A common problem with air ducts is leaking. When they are not functioning properly, the furnace will have constant problems even when turned on. In some cases, a damaged air duct can cause your temperature to be too low. If you notice that your temperature is not being maintained properly despite having a steady flow of hot air, check to see if your home’s air ducts are functioning properly. If there are any signs of damage or leaks in the system, replace them immediately.
11. The Condensate Lines Are Clogged
The condensate lines are the pipes that drain water from the furnace. If you have a clogged condensate line, the water will build up in your furnace and cause problems with its operation. You can check whether they are clogged by inserting a screwdriver into one of the openings on the top of the furnace to push down on it. If you notice that this does not work, you should call an expert to fix the condensate lines.
12. The Thermal Expansion Gap Is Too Small
Your furnace can blow cold air despite having a steady flow of hot air due to the thermal expansion gap. The thermal expansion gap is the space between the hot and cold sides of a thermostat. If there is too narrow of a gap, the thermostat will not be able to maintain an even temperature throughout your home. To fix this problem, you must adjust the height of your thermostat.
13. The Air Filter Is Dirty
A clogged air filter will cause your furnace to leak cold air constantly. Clogged filters will reduce the amount of airflow through the furnace, causing it to stop working properly. If you notice that your furnace continues to blow cold air despite having a steady flow of hot air, check the condition of your filter, and replace it if necessary.
14. The Furnace or Heater Is Not Clean
Furnaces and heaters gather dust over time, and dust buildup inside the unit will cause it to malfunction. If you notice that your furnace is blowing cold air despite having a steady flow of hot air, it could be because the unit has accumulated too much dust. Remove the furnace cover to clean inside. Use a vacuum cleaner to clean out any dirt or other debris that is inside the unit.
15. Inadequate Gas Supply
When the furnace is not receiving enough gas, it will be unable to generate heat. To check your furnace’s fuel supply, take a look at the gas meter. If it is reading zero, the unit might not have any gas. Turn off all of the gas valves and call an expert to fix the problem right away.
It is very important to keep your furnace or heater working properly. If you notice any difficulties with it, contact our professional technicians to diagnose the problem. Our furnace maintenance and repair professionals will be able to solve the problem and restore your furnace to its previous condition. Also, if you require help in light commercial refrigeration, indoor air quality, and AC replacement and repair in Las Vegas, NV, and surrounding areas, contact Polar Air & Heating, Inc. today.