7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. The colder the outside temperature gets the more air we have dropping from the vents. Why tell this story? But all you have to work with are the symptoms. If the smell isnât coming from the vents, itâs most likely a leak at a ⦠You should clean or replace your air filter every 30-60 days anyway for improved HVAC efficiency and better indoor air quality. 8,692. My question/issue is that two of the returns and 3 of the supplies have pretty bad (cold⦠When the furnace is turned on, the dust gets burned off. The air coming from your vents is first chilly, eventually turns warm but then gets chilly again before the fan cuts off completely between heating cycles Explanation: Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. Anyway, cold air is felt coming thru the vent. of Energy and a few other sites had similar R value requirements, so there must be some explanation. 3,770. Villa's figures came from the U.S. Dept. There is ⦠1) turn off recirculate. 3) turn on heat and see if it blows cold air in the vent positions mentioned above. I had a 1980 Ferrari that did not come stock with AC. By changing out your air filter you can help return proper airflow to the entire system. I usually have the windows down if the AC is off so I guess I never noticed. We build a house 1 year ago and when the temperature gets below 50 degrees outside we start getting cold air coming through 4 vents of our house. Nov 19 2012, 7:46pm. Seriously? There are 3 returns on the 2nd floor, and about 10 supply vents throughout both floors. Your objection to the proposed R values sound reasonable to me. Semirhage626. I have never had an AC unit's fan come on if the AC/heat was turned off. Semirhage626. If you turn on the heating system and notice that cold air is coming out through the vents, then this shouldnât be puzzling, especially if the system has been off for a while. During the summer, dust settles within the HVAC on the heat exchanger. (pressing this buttons turns on compressor) 2)Move your selector switch and see if the vents on that side blow at feet, dash, and top of glass. The cooling system's air handler is in my attic, and duct work was added for the 1st and second floors for cooling. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. Itâs only if after a few minutes and the system still continues blowing cold air that you should worry because then there is ⦠8,692. My thermostat is off, but there is air blowing from my vents. So 85-92°F feels cold to new heat pump owners. All vents are on the opposite side of the house than the furnace. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range. I hope this helped, Re: Air Through Vents even while ac/heat off. My thermostat is off, but there is air blowing from my vents. JustinRandy131. Which means that they blow what ever air is selected. 3,770. Sometimes, when you first turn on the heater, it can smell like gas is burning. If you want to keep cold air form coming into the cabin, press the recirc button. JustinRandy131. Most cars do not have AC vents, only climate control vents. There are exceptions. It was added by the dealer. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. CIRCULAR VENTS VS RECTANGULAR VENTS; Circular vents tend to make a lot less noise than rectangular vents. Your heater Blows cold Air/AC Blows hot air hot air must be explanation. 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