My air out the supply vent is 66F, at the return it's 76F. If you haven't had anything done to the system, and have test the system the way I said, this isn't something new, just an adjustment to the damper valves on the duck pipe running from your heater to this area you're concerned about. When the hot air is coming out of the register from the ceiling, all of the hot air will hang out around the middle of the room and up to the ceiling. I have this one bad draft that I couldn't pin point until I realized it's cold air coming from out of the return air register located in the living room (couch nearby ). 2. There are many issues that can cause your heater to blow cold air. In my home the air filters are located just inside of the two large return air registers. The reason that a back-draft occurs is the same reason that air moves any where there is higher pressure one end than the other, if the main part of your home is at a lower pressure than that in the return you will have a draft from the cold air return, so look for any exhausts that may be on or chimney vents , anything that vents out of your home. If the supply air is around 120 degrees which is about normal for a gas furnace then the return air will be around 82 so it may seem cold compared to the air coming out of the supply. Try closing some air vents in bathrooms, … If the supply ducts are high or in the ceiling, then the return-air ducts or grills should be low on a wall. My heat is on but cold air coming out vents. The vent that is for cold air return should hold the paper to the vent, the other is discharging warm air so shouldn't hold to the vent. 5 Reasons Cold Air Comes Out of Your Vents When You Turn On the Heat Check the Thermostat. When contractors first installed central air, they put in a single big return vent somewhere central in the house. It is an air inlet. The very first thing you should do when you start to notice that there is no air coming out of a vent in your home is to try to open or close the damper, just to make sure that it is working. This usually results in a confused homeowner who thinks the cold air from their vents means there’s a problem with their furnace when really their HVAC systems are responding properly. If you have a basement, the cooler air will circulate through the vents when the fan is not running. The Role of Cold Air Returns. … The exhaust is connected to a duct that leads outside where the fan distributes the hot wet air that occurs during a shower. If you have an air scuttle (a vent pipe to the exterior that brings in fresh air when the system is running) this will allow air into the system when it is off, especially if there is no … Older … Their purpose is to allow air to return to the furnace to be heated or cooled. The major benefit of drawing inside air is that it is closer to the desired room … Cold air coming out of duct work. Let’s look at some common issues that would cause your furnace to blow cold air. I had the same problem with cold drafts coming thru the ac vents that are not used for heating in the winter (I too have baseboard hot water heating and only use the ac and ducting in the summer). This post will explain what causes cold air to come out of the vents when you have your heater on, when warm air should be coming out instead. Does it hurt the furnace by blocking a vent? Especially if your furnace is blowing cold air. If your home has returns in most rooms this is the best setup, allowing for the best circulation and air flow. When a heat pump begins the defrost cycle, the outdoor fan shuts off and the system switches over to cooling mode. 6 Answers. The reason for this, is that in … I don't believe my unit (Goodman GSC 130361) 3 ton, is blowing air that is cold enough. Inspect your return air filter for signs of discoloration from mold. Keep the doors to each room open so air can properly circulate. Do … Cool air coming from some of returns instead of heat Some cold air returns draw air from outside and some from inside the structure. I installed a less restrictive filter and … Answer Save. One thing you can try immediately is this: remove the grill covering the return where you feel cold air entering the room. I have 3 returns and a lot of supply vents and covering each one individually would be time consuming and not practical. How … 2. The causes of this problem and the best solutions reveal some of the basic physics of chimneys. When the heat is on, the warm air blows, but otherwise, it's blowing cold air - it almost feels as if it's A/C air. Why Having Unobstructed Cold Air Registers Matters. But … There is a small plastic device called a damper flap that regulates the flow of air – in … Why Is My Furnace Blowing Cold Air? Does the HVAC that this return vent is connected to reside in the attic, basement, or crawl space? Is it low on the wall, high on the wall, or in the ceiling? Seems anytime the heat is on, it's nice and toasty in the house, but when it's off, there is … Don't know brand or if it is a heatpump - think it may be since it is one unit supplying AC and heat. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. The cold air return ductwork is as important to your home’s heating and air conditioning as the lines coming out. 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