Furnace Blowing Cold Air in Las Vegas? 9 Causes (And Which Ones Need a Pro)

It’s that moment every Las Vegas homeowner dreads when winter sets in. You turn your furnace on, and you get nothing but cold air from the vents. Don’t panic. In many cases, the fix is simple. In others, it’s a sign you need furnace repair that Las Vegas homeowners can trust. Below, we’ll cover some of the most common causes.

9 Common Reasons Your Furnace Is Blowing Cold Air

1) The Thermostat Is Misreading the Temperature

Thermostat issues are surprisingly common. Low batteries or a wiring issue can also cause incorrect signals.

Replace the batteries and make sure you’ve got the right settings. If that doesn’t help, you’ll need Las Vegas heater service.

2) The Filter Is So Dirty the Furnace Is Overheating

When airflow gets restricted, the system can trip a safety switch and shut the burners off, but the blower keeps running, pushing cool air.

Replace the filter and make sure vents aren’t blocked. If it keeps happening, call a professional for heater service.

3) Your Furnace Is in “Warm-Up” or Delay Mode

Most systems run the blower a little after ignition to avoid pushing cold air through the house. Wait a few minutes and see if it warms up.

4) The Pilot Light Is Out (Older Furnaces)

If you have a standing pilot and it’s out, the furnace won’t heat, so you may only get fan air. Follow the manufacturer’s relight instructions exactly. If it won’t stay lit, the thermocouple may be failing.

5) The Igniter Isn’t Working (Newer Furnaces)

Modern furnaces use electronic ignition. If it fails, burners won’t light, and you’ll feel cold air. This isn’t something you should fix yourself, and is one of the most common Las Vegas service calls.

6) Dirty Burners Are Preventing Proper Flame

Dirty burners can mean poor ignition or no ignition at all. Burner cleaning is part of professional heater service.

7) A Dirty Flame Sensor Is Shutting the System Down

The flame sensor verifies that the burners are lit. If it’s dirty, the furnace may light briefly and then shut off. The sensor is inside the burner compartment, and only trained technicians should replace it.

8) The Blower Motor or Belt Isn’t Doing Its Job

The blower motor is what moves the heated air through the ducts. If it’s not working, you’ll notice less (or no) airflow. Motors, capacitors, and belts are heating repair items best handled by trained techs.

9) It’s Not Actually a Furnace, It’s a Heat Pump in Defrost Mode

Some Las Vegas homes use heat pumps. During defrost cycles, a heat pump can temporarily blow cooler air as it prevents ice buildup.

When to Stop DIY and Call Right Away

If you notice any of the following, call a professional right away:

• A burning or “electrical” smell
• Repeated cycling (turning on/off over and over)
• No ignition after multiple attempts
• Unusual banging/boom sounds
• Any gas smell (leave the home and contact your gas provider)

If your furnace is blowing cold air, we’re here to help. Reach out to Elite Heating & AC Repair to schedule furnace repair that Las Vegas homeowners can count on.