3 Chilly Reasons Why Your Furnace is Blowing Cold Air

If you furnace is blowing cold air in Massachusetts, we’re sorry! No one should have to weather (pardon the pun) 20-degree weather while your vents blow cold air.

Good news: this problem may be easy to solve and won’t cost a dime.

Here are 3 reasons why your furnace is blowing cold air—and what you can do about them.

1) Thermostat is on the wrong fan setting
Does the furnace only blow heat sometimes? Is the blower running constantly?

Most likely, your thermostat’s fan setting is set to “ON”, meaning the fan is always on whether the air is being heated or not. Set your thermostat to “AUTO” so that only heated air will come out of the vents.

2) Pilot light is out
Older gas furnaces have a pilot light. The flame may have gone out, causing the furnace to keep blowing air, but it’s not heating it.

Follow these steps to re-light the pilot:

Step 1: Locate pilot light assembly and switch
The assembly and switch are usually located at the bottom of the furnace near a small knob that usually has these 3 settings:

  • “Pilot”
  • “Off”
  • “On”

Your furnace’s user manual should have a diagram to showing you where it is. If you can’t find your user manual, find it online.

Step 2: Turn the switch’s knob to “Off”
After turning the knob to “off”, wait 3-5 minutes. Make sure no gas coming out of the pilot.

Step 3: Turn knob to “Pilot”
This re-starts the flow of gas to the pilot.

Step 4: Hold down reset button and hold a light at the pilot opening
Hold down the reset button on the pilot control panel and hold your lighter to the pilot opening until the flame lights. The flame should be a steady blue cone.

Step 5: Turn the knob to “On”
The furnace should ignite and should only blow hot air.

If the pilot flame won’t light or won’t stay lit then the pilot light opening may be dirty and needs cleaning. Or the thermocouple, a gas safety device, may be malfunctioning and needs to be replaced. Luckily, a new thermocouple is not expensive.

3) No supply of gas to the furnace
There may be a lack of supply of gas to the furnace due to:

A closed gas valve. The furnace’s gas valve switch should be in the “On” position (parallel/in line with the gas supply pipe.)
Your gas supply company is having problems. Call your local gas supply company. They may be having issues supplying gas to your home.

Did none of these solutions help? Schedule a service call with us and we’ll be out ASAP.

Whether you need heating repair in Hopkinton, Ashland, Framingham, or anywhere else in our MetroWest service area, give us a call!

Nicholson Heating, Air Conditioning and Plumbing gladly serves the Framingham-area. Contact us online to learn more about our services.

Our level of commitment to our customer and superior service is the reason you can find comfort in choosing Nicholson Plumbing, Heating & Air Conditioning.

Book Online

We Take Pride in Our Work

Read about all the great things our customers have to say about us!
  • Francis from Nicholson Plumbing and Heating was excellent. He was here to evaluate HVAC in our home. He was very patient and answered all my questions. He is also polite and easy to communicate with him. He explained technical concepts to me in layperson terms!

    - Shelley S.

  • Nicholson offered what is possibly the best customer service I have dealt with in a home repair situation.  I called them because I was looking to replace my very old furnace.  They came out to do an initial estimate, and then came back when I had some further questions about my options.  After installing the furnace, they ran into some problems with my air ducts.  This happened on a Friday, and the problem was fixed by Monday afternoon.  In addition to their excellent service, they did quality work at a fair price.  I would recommend them to anyone looking for an HVAC company in the Framingham area!

    - Melissa T.

  • Recently used these guys because my HVAC unit AC wasn’t working (first hot day of summer).  Showed up on time, wore booties, fixed the unit.  During the visit we talked about how my unit was having problems in the winter – which was resulting in NSTAR service calls of maybe 3-4 times per season (I am on a service plan with them).   He was the first guy to tell me WHY the problem was happening, and HOW to fix it.  I find it strange that all of the NSTAR guys etc. no one took time to point out how to fix the source of the problem…Very professional, smart.  I would use them again, and plan to for the fix on my heating unit!

    - Ben J.

Read Our Reviews

We’re Ready to Help!

(508) 881-1500
Call Now

Our Brand Partnerships

Nicholson Plumbing, Heating and Air Conditioning is the best and most reliable source for electrical service. We are proud to be Mitsubishi Electric Diamond Elite Contractors, that have gone through extensive accreditation and training in order to provide proven high-quality service. Get in touch with us whenever you need to have electrical work done in Framingham!

Learn More