What does it mean if my cold air is coming out of the air intake vent?

by Johnathan
  14 answers
  • GrandmasHouseDIY GrandmasHouseDIY on Aug 27, 2021

    This is what I'm reading online but if this is a new development I would call a professional company: "This can be a normal occurrence if the return passages such as joist spaces, outside wall spaces, etc are used. If these passages run thru unheated areas or areas that are drafty because they are on an outside wall with no insulation, then yes, with the fan shut off this cold air will transfer to the heated area of the home via the return grille. Check out any passage that has an outside wall rim joist that is not insulated or sealed ,thus allowing cold air from the outside to come in."

  • Lindsay Aratari Lindsay Aratari on Aug 27, 2021

    I would contact a local AC repair service to take a look

  • Betsy Betsy on Aug 27, 2021

    Hi Jonathan: Yikes! I read this:

    "The first thing that needs to be done is to remove a lot of the moisture. Once that happens you will find that the house temp will begin to fall. As long as the thermostat is calling for cooling the system will not cycle on and off. That will only happen once the house cools down to the setting on the thermostat that is set to."

    Take a look at these sites and see if you can get some help:


    https://www.hometalk.com/diy/repair/air-conditioning/q-air-is-blowing-out-the-air-intake-vent-1844301 If you click on "See this discussion" below, you will get the whole scoop.

    Good luck

    Air is blowing OUT the air intake vent.
  • William William on Aug 27, 2021

    Did this just happen? Is any cold air coming out of the supply vents?! Have you had any work done in the home recently?! Are any of the supply vents closed or blocked?! When is the last time you replaced the filter?! Dirty filter would be a restriction and the air needs to go somewhere same for closed or blocked vents so the air backs up. A defective thermostat in the "on" position can switch to a higher blower speed that the ductwork can't handle.

  • Cynthia H Cynthia H on Aug 27, 2021

    I used to live in a very old house that was poorly insulated. The wall and floor grates always had cooler air coming from the ducts when the furnace wasn't running. In my current, updated home, it's going to be heating season and it's time to have things checked out before it gets cold. Good luck!

  • Chloe Crabtree Chloe Crabtree on Aug 28, 2021

    Leaks in your ductwork means that cold, unconditioned air from inside your attic gets sucked into your ductwork. That cold air mixes with the warm air from your furnace, causing the air coming from your vents to feel considerably cooler than it should.

  • Is your system on when this happens? Sometimes cold air drops out of our vents when they're open even when the system is off, since cold air drops. But not sure if that's what you're asking.

  • Kmdreamer Kmdreamer on Aug 31, 2021

    The hose came off or you have. Hole

  • You might need to have an HVAC company come out and take a look.

  • Redcatcec Redcatcec on Sep 01, 2021

    It means the air intake air valve has failed or is failing, call a professional HVAC .

  • Maura White Maura White on Sep 02, 2021

    There is a gap somewhere where cold air is getting outside instead of inside. Check to make sure everything is sealed. You may need to contact a professional AC repairman to find what is going on.

  • Mogie Mogie on Nov 14, 2022

    Does this happen when the heat is on or the ac or all the time?

  • Sameh Sameh on Dec 28, 2022

    I have an issue with my return vent in the bedroom. instead of recycling room air, it blows out hot air which makes the room temp more than 80 degrees. What also baffling is that it blows hot air even when the heat is turned on in a different Zone. That is; my bed room is in zone 2, but when I turn on zone 1 while zone 2 is off, the vent still blows out hot air. I subscribe to one of those home appliance repair insurance and when the guy check it out, he told me to clean my vents without providing any help. Any idea what is going on?

  • Mogie Mogie on Jan 01, 2023

    Time to get the unit serviced.