Your furnace may be blowing cold air
because the filter is too dirty
. A dirty air filter blocks airflow over the furnace's heat exchanger, causing it to overheat. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack.
Why does my heat feel like cold air?
There are a few reasons your heat pump could be blowing cold air. …
Turn off the heat at the thermostat and check your air filter
. If it's dirty, change it! Make sure the thermostat is set to “AUTO”, not “ON”.
Why is cold air coming out of my vents when the heat is on?
Your Air Filter Is
Dirty
Clogged air filters could be causing cold air to blow out of your vents. A dirty air filter can block airflow over your furnace's heat exchanger, which can cause it to overheat.
What do I do if my heater is blowing cold air?
When your furnace blows cold air,
try turning the heating unit off and on
. If the air feels warm for a moment or two, then switches to cold, it may be that the flame sensor is dirty. With a dirty flame sensor, your gas burner won't stay lit, causing the air to go cold soon after the furnace turns on.
How do I know if my heat pump is working properly?
The main way to tell if your system is working as intended is to
simply listen to the unit running
. You can hear the system when it turns on, when the fans begin to work and stop, and when air passes through the ducts. Other than that, the unit itself should be quiet, without any groaning or creaking sounds.
What temperature should the hot air be coming out of the vent?
The air coming out should be
14 to 20 degrees cooler than the air flowing in
. Move the thermometer to a vent in each room or area of your home. If any of the vents are much colder or warmer than another, there may be a problem with the ductwork, or the distance may be too great from the blower.
Why is my heater not blowing hot air in my house?
First, check
to make sure the thermostat is set correctly
. You will want to make sure that the fan control is set to auto, and not ‘on'. If the thermostat appears set correctly, turn off your heater at the thermostat and check the filter. If the filter is dirty, replace it.
Why is my furnace running but no heat?
Furnace filters
Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won't warm up. If the blower is running but no heat is coming out,
replace the filter
.
Why is my furnace running but not blowing hot air?
Furnace overheating can be the cause of your cold air dilemma.
Changing the dirty air filter
can solve this problem. The dirty air filter blocks the airflow, causing the furnace to run longer to heat your home until it overheats. It is important to note that constant overheating can damage your heat exchanger.
Why is the dryer blowing cold air?
One of the most common reasons your tumble dryer decides to blow out cold air instead of hot is, rather ironically,
because it has overheated
. … If your tumble dryer does not have a reset button it is likely you will need to replace your thermostat and thermal overload cut-out (TOC).
How do I fix the heater in my house?
- Check that your thermostat is set to “heat.” …
- Change the filter. …
- Make sure the gas is on. …
- Clear the chimney exhaust flue. …
- Clean away leaves and debris from exhaust vents. …
- Flush out the drain lines. …
- Check for blocked ducts restricting airflow.
What is the average life of a heat pump?
The average life expectancy of an air conditioner or heat pump is
10–12 years
. The average life expectancy of a furnace is 15–20 years.
How can I tell if my heat pump is low on Freon?
- Leaking Heat Pump. Even though a heat pump uses refrigerant to cool or heat a home, the refrigerant doesn't dissipate during regular operation. …
- Icing. …
- Inefficient Performance.
Is it normal for AUX heat to come on?
The temperature outside is
below 35°
Usually, once outdoor temperatures fall below 35°, a heat pump will struggle to keep your home warm and will automatically switch to AUX heat. … If it's an unusually cold Arizona day, it's normal to see AUX heat on your thermostat.
How do you calculate temperature rise?
Subtract your beginning temperature from your ending temperature
to find the rise in temperature. In the example, 80 degrees minus 76 degrees equals a 4-degree rise in temperature.
Can a dirty furnace filter cause no heat?
Dirty furnace filters
Is your furnace firing up but not blowing heat as hard as normal? … That's because air filters
trap
dust, dirt and debris like hair, which over time can restrict or block vital air flow, overheating the heat exchanger and preventing your furnace from working as it should.
