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  1. #1
    Join Date
    Feb 2011
    Chicago suburb

    HVAC Fan - Run Continuously or Auto?

    Recently had the Carrier Infinity system installed- what an AWESOME unit!!

    Is it better to leave the fan on continously (low) or put it on auto?


  2. #2
    Join Date
    Mar 2011
    Galveston Texas
    i usually tell my customers it's a personal prefrence. The downside to having the fan run all the time is it dosen't allow all the water to run off of the coil in the cooling mode. When this happens it gives the house a more humid feeling...esp. if you live in a humid environment and that's what it's trying to do anyway is get rid of the humidity.

    Personally i have mine on an intermitent setting where it'll cycle off for a short period and then the fan will come back on. whether or not the system is calling.

  3. #3
    Join Date
    Jan 2002
    Quote Originally Posted by BPChiIL View Post
    Recently had the Carrier Infinity system installed- what an AWESOME unit!!

    Is it better to leave the fan on continously (low) or put it on auto?

    Let the Infinity do it's job. Just use it for awhile until you get used to the new feel of having a v/drv unit...
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  4. #4
    Join Date
    Jul 2004
    How you use the system is for you to decide. As to the pros and cons, there are a few considerations. For example:

    During the cooling season, at the end of a cooling cycle the fan should turn off for about 2-3 minutes, then restart. The 'off' cycle is to allow water condensed on the indoor coil to run off the coil and out the system drain. That keeps evaporation of that water to a minimum, thus enhancing the dehumidification process. If you elect to have the fan continue to operate absent a cooling call, you'll likely be comfortable at a slightly higher temperature setting due to the movement of air in the rooms aiding in evaporation of moisture from your skin. If you elect to have the blower off absent a cooling call, when sitting still your body may warm the air surrounding it, thus making you feel warmer than the room temperature. For that reason, continuous fan operation is a plus in the cooing season.

    If you use the same system for heating, you may prefer to have the blower cycle 'off' absent a call for heating.

    But if you have IAQ products installed, their operation is improved substantially when the blower is turning slowly, as it does with the Infinity variable speed products.

    So depending on the season, depending on the system components and depending on your personal preferences, it's all very clear and simple, right?
    If YOU want change, YOU have to first change.

    If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!

  5. #5
    Join Date
    Jan 2007
    couldnt have said it better myself

  6. #6
    Join Date
    Dec 2009
    Roswell, Georgia

    where is your ductwork?

    if Your ducts are in the (hot) attic, you may not want to run the fan in the summer as you will pick heat from the attic. If you have nice R8 ducts or a very cool attic, not so much of a problem.

    Your call. If you have a problem room to cool upstairs - one that is way off in the corner and hard to keep cool - the benefit may outweigh the negatives

    Ducts in basement or brawl space? fan in ON position 24/7, year round.
    Mine has not shut off in 3 years, using only 83 watts on continous low speed.

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