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