Chilly Air from Your Heater? Common Causes and Fixes For San Angelo Home Owners
As temperatures start to drop in San Angelo, Texas, a functioning heater becomes essential for keeping homes comfortable. But if your heater is blowing cold air, it’s a frustrating problem that needs immediate attention. Whether you have a furnace, heat pump, or another heating system, there are several potential reasons for cold air. Let’s explore some of the common causes and when it may be time to look for furnace repair in San Angelo.
The Thermostat Is Set Incorrectly
Sometimes, the thermostat settings can accidentally get changed or might not be set to heat properly. First, check that the thermostat is switched to “Heat” mode and not to “Cool” or “Fan.” If it's set to “Fan,” the blower will circulate air even when it’s not heated, which can feel like cold air.
It’s also a good idea to check if the temperature setting is high enough to trigger the heating system. Some programmable thermostats may need a reset if the power has been interrupted recently, so checking for updates on the thermostat display can also be useful. Proper thermostat settings can prevent unnecessary calls for repair.
Issues with the Pilot Light or Ignition
For gas furnaces, a pilot light or electronic ignition failure can be a significant reason why the heater blows cold air. If the pilot light is out, you may be able to relight it by following the manufacturer’s instructions. However, if it’s an electric ignition, it’s best to let a professional handle it to avoid damaging sensitive components.
If the pilot light keeps going out or the electronic ignition fails frequently, there may be an underlying issue with the thermocouple, gas supply, or electrical connection that requires attention from an HVAC technician.
Dirty Air Filters
Clogged air filters restrict airflow, causing the heater to work harder to distribute warm air. When filters become dirty, they can cause the heating system to overheat and trigger a safety shutdown. This can result in the blower circulating cool air instead of warm air as the system tries to reset.
A good rule of thumb is to replace or clean air filters every one to three months, especially in homes with pets or high dust levels. Regular filter maintenance not only prevents cold air issues but also improves indoor air quality and keeps your heating system running efficiently.
Duct Leaks
Air ducts distribute warm air throughout your home, but over time, they can develop leaks or tears. If there are gaps in your ductwork, heated air might be escaping before it reaches your living spaces. This can lead to your heater blowing cool air from the vents even though it’s technically working.
Inspecting ducts for visible gaps or damage can help identify the issue. However, duct sealing or repair is typically best handled by professionals. A licensed HVAC technician specializing in furnace repair in San Angelo can perform a full inspection and repair any leaks or tears in your ducts to ensure warm air flows efficiently.
Malfunctioning Limit Switch
The limit switch is a safety component that prevents the furnace from overheating by controlling when the blower fan should turn on or off. If this switch malfunctions, it might cause the blower to continue running even after the heating cycle has ended, resulting in cool air blowing through the vents.
A malfunctioning limit switch is a common problem in older systems but can happen in newer models, too. Replacing the switch requires expertise, so if you notice your heater blowing cold air intermittently or continuously, it’s wise to schedule an inspection with a professional.
Insufficient Gas Supply
If you have a gas furnace, a limited or disrupted gas supply can prevent the system from producing sufficient heat. When gas flow is restricted, the furnace might still blow air, but it won’t be warm. Issues with the gas supply could stem from closed valves, low gas pressure, or problems with the gas meter.
For safety reasons, always contact your gas provider or a licensed technician if you suspect a gas supply issue. Handling gas lines on your own can be hazardous, so leave this work to the professionals for the best and safest outcome.
Heat Pump in Defrost Mode
If you have a heat pump instead of a furnace, it may be in defrost mode, especially during colder weather. When outdoor temperatures drop, ice can form on the outdoor unit, and the heat pump reverses operation temporarily to defrost. During this cycle, cool air may come through the vents for a few minutes, which is normal.
However, if you notice frequent or prolonged defrost cycles, it could be a sign that your heat pump is struggling with excess ice formation or has other issues. A professional inspection can identify if there’s a malfunction, such as a stuck reversing valve or low refrigerant levels, both of which can interfere with heating.
When to Call for Furnace Repair in San Angelo
If you’ve checked your thermostat, replaced the filters, and confirmed there’s no issue with your gas supply, but your heater still blows cold air, it may be time to call for professional furnace repair in San Angelo. A skilled technician can quickly diagnose the problem, ensure all parts are working correctly, and restore warm air to your home.
Stay Warm This Winter in San Angelo
Don’t let a malfunctioning heater ruin your winter. Regular maintenance and prompt repair can keep your heating system running efficiently and extend its lifespan. If you’re experiencing cold air from your furnace or heat pump, reach out to a trusted HVAC professional in San Angelo today.
