6 Reasons Why Your Heater Is Not Blowing Hot Air

why heater not blowing hot airWinters in New Jersey often bring plenty of cold weather, snow, and ice. Staying comfortable during frigid temperatures usually requires a functional furnace, so the last thing you would want is for your heater to break down when you need it most. 

So, why is your heater not blowing hot air? The top-rated HVAC professionals at Davis Home Services understand that there are several reasons why a furnace stops producing warm air. You can stay warm all season long with heating services in Cherry Hill by Davis Home Services, but if your furnace isn’t blowing hot air, you can find out why in this article. 

Why Is Your Heater Not Blowing Hot Air?

1. The Furnace Is Off

The answer to why your heater is not blowing hot air might be your thermostat. With the temperatures changing, it is not unusual to unintentionally set the thermostat incorrectly when shifting from using the air conditioner to using a heater. 

When your heater stops blowing warm air, you should first check the thermostat and furnace. Make sure the switch on the heater is in the “on” position. If you have a gas furnace, you might need to use an extender lighter to ignite the pilot light before turning the system on. Then, ensure that you set the thermostat to “heat” and “auto,” not the fan setting. 

2. The Air Filter Is Dirty

It is best to change your HVAC’s air filter at least once every three months, but it is easy to overlook this maintenance step. However, furnaces, heat pumps, and air conditioners require plenty of airflow to maintain indoor temperatures. It doesn’t take long for the screens to clog with hair, dust, pollen, pet dander, and other airborne pollutants.

Unless you change the filter, the debris from it will dirty the system and cause a reduction in performance. Components within the heat pump or furnace can overheat and cause the system to break down. As a result, the warm air will stop flowing into the house.

3. The Heater Has an Electrical Problem

Sometimes, a furnace can trip your home’s electrical circuit and stop working. A gas furnace with problems may also shut down as a safety precaution. 

You can check your electrical box to see if the system tripped a fuse when that happens. If you are uncomfortable handling this task, you should call an HVAC professional. You likely won’t need an electrician, but a heating and cooling technician can safely troubleshoot the system. 

4. The Heat Pump Is Leaking Refrigerant

Your heat pump will act as an air conditioner in the summer and a heater during the winter. It relies on refrigerant for its heat transfer to cool your home and heat production to warm it. A refrigerant leak in the system will prevent the heat pump from sufficiently heating your home. 

If your home remains cool because its heat pump does not produce hot air, your refrigerant levels could be too low. A heating technician will need to add more refrigerant after finding and fixing the leak. Unless you address this issue, the refrigerant leak could increase humidity in the house, making it feel colder than average. 

5. The Ductwork Has a Leak

Hot air from your furnace travels to every room in your home through ducts and vents. Rooms will feel colder than you may like if there is a leak in the ductwork. Even if the heater produces sufficient heat, the warm air will not circulate through your house if air seeps out of the ducts due to cracks or holes. 

Inadequate ductwork insulation could cause leaks. Rodents inside your attic can also get in your ducts and weaken the system. 

Drafts from a lack of insulation can also rob the air inside your home of warmth. The combination of a compromised ventilation system and poor insulation will prevent heated air from having a proper distribution throughout your home. 

6. The Vents Are Blocked

Another reason your heater is not blowing warm air could be blocked registers or vents. Some people unintentionally block vents with furniture or intentionally block them to drive additional warm air to specific areas in the house. Unfortunately, obstructing or closing the registers prevents the furnace from receiving enough airflow to work correctly. 

Unless the heater has enough airflow, the system will overwork to compensate for the loss. An overworked HVAC system will have a premature breakdown, which will prevent the unit from distributing warm air. 

Always check your registers to ensure that each one is open to expel air. If you close one vent, that should be the only room that feels cold. If multiple rooms lack warmth with one register closed, you likely have a ventilation issue on your hands. 

How to Keep Your Electric or Gas Furnace Blowing Warm Air

Ignoring your heating and cooling system is one of the worst things you can do as a homeowner. These systems require regular maintenance to function correctly. It is a good idea to schedule a professional HVAC tune-up twice a year, once in the fall and again in the spring. 

When heating experts tune up your furnace, they will check all its components to ensure that everything is working correctly. The technician will examine the electrical and gas components, change air filters, and make necessary repairs so that the furnace blows warm air through the house. 

Call an HVAC Contractor You Can Trust

If your furnace is not blowing hot air, you might want to troubleshoot the issue to keep temperatures comfortable indoors. Some troubleshooting options are simple. For instance, you could check the thermostat to ensure correct settings or change a dirty filter for maximum airflow. 

However, it is usually a good idea to reach out to a professional HVAC contractor to handle extensive furnace repairs because working with gas and electrical appliances can be dangerous. If you want to know why your heater is not blowing hot air or learn more about heating repairs, reach out to the team at Davis Home Services by calling 844-226-9872.

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