Notices
Results 1 to 5 of 5

Thread: Can Fans cool your house on a hot summerday when no one is home?

  1. #1 Can Fans cool your house on a hot summerday when no one is home? 
    New Member
    Join Date
    Jun 2014
    Posts
    2
    I know some people who leave fans on in their house during hot summer days when no one is home, believing that this practice will keep their home cool until they return in the evening. When you tell these people that this practice is a waste of electrical energy, and their house may actually be warmer when they get home, they usually come up with excuses such as, that they want the air to be circulating, etc.

    I remember some years ago, elderly people in France died during a heat wave, because their residences were not air conditioned. Could these deaths have been prevented by using methods and equipment that might have been available to them?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Radioactive Isotope cosmictraveler's Avatar
    Join Date
    May 2005
    Location
    Key West, Florida, Earth
    Posts
    4,788
    I had a large fan located in a hallway that sucked the air from the entire house and blew it up and out through the attic so it circulated the air very well. It made a big difference during the summer months so much so that my parents didn't put AC in for over 15 years after it was available

    Circulating hot air in a closed environment won't help much. If AC were to be installed that would have helped allot.


    When the power of love overcomes the love of power the world will know peace.
    Jimi Hendrix
    Reply With Quote  
     

  4. #3  
    Forum Bachelors Degree One beer's Avatar
    Join Date
    May 2013
    Posts
    442
    Yes, I open the attic/loft hatch in hot periods. This allows hot air in the house to go up into the roof, rather than it getting trapped in the bedrooms.

    Unless you are using fans to replace air in the house, they will not be effective unless blowing on your skin, because that increases evaporation and takes heat away from your skin - latent heat of evaporation?

    Fans blowing air around an otherwise closed house with nobody at home will do very little except perhaps to equalise the temperature and remove hotspots, but as cosmic says, they will increase heat overall due to the heat from the fan motors.

    OB
    Reply With Quote  
     

  5. #4  
    Forum Cosmic Wizard
    Join Date
    Aug 2013
    Location
    San Diego
    Posts
    2,227
    Quote Originally Posted by Janitor View Post
    I know some people who leave fans on in their house during hot summer days when no one is home, believing that this practice will keep their home cool until they return in the evening.
    This will usually keep your home cooler. It's what we do and works well.
    Reply With Quote  
     

  6. #5  
    Forum Professor jrmonroe's Avatar
    Join Date
    Mar 2010
    Posts
    1,444
    One beer is right. If fans merely circulate air in a room, it will raise the temp due to the heat generated by the motor. To test what I say, come home after leaving the house all day with any fan on, turn off the fan, and try to touch a metal part of the motor (even the fan's axle will do), and be prepared to jerk your hand away quickly. What people actually feel when they come home is that circulating air is more refreshing than still air, even if it's a bit hotter. It would be better to put the fans on timers to turn on a few minutes before arriving home.

    In addition to other methods given here already, one method of keeping a house cool is to close the windows and draw the shades or close the blinds to keep as much of the sun's radiation out, and sometimes you can even continue this through the evening. A roommate showed this to me years ago. It works best with well-insulated houses.

    Another method is to use window fans blowing out of high, sunny windows of the house, and leaving doors open to allow air to circulate through the house. Also allow air to enter the house from low, shaded windows cellar windows if possible.
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
    Reply With Quote  
     

Similar Threads

  1. Video: Cool halloween Experiments to do at home!
    By ProfEgghead in forum Education
    Replies: 3
    Last Post: October 30th, 2013, 04:02 PM
  2. Roof House Paint For Hot Summers
    By Perplexion in forum Pseudoscience
    Replies: 1
    Last Post: April 3rd, 2013, 06:27 AM
  3. FANS
    By ddd in forum Physics
    Replies: 2
    Last Post: August 8th, 2010, 10:46 AM
  4. Replies: 1
    Last Post: December 21st, 2008, 03:50 PM
  5. Cool drinks, cool and drink!
    By sramanujam in forum General Discussion
    Replies: 3
    Last Post: October 16th, 2006, 09:03 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •