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