Results 1 to 11 of 11
  1. #1

    Confused Ductless heat pump / AC outdoor unit installed on my porch?

    I am looking at the options of installing a ductless mini split heat pump (18000 BTU) and was given 3 options:

    1). Wall bracket - lowest cost one but may have vibration/noise issue according to the contractor
    2). Concrete slabs on the ground - recommended by the contractor but highest cost because of the amount of the work
    3). On my wooden porch - may have noise issue because it will be closed to my living room window

    The porch option seems pretty good to me because a. it has a roof so the unit will be protected against snow/rain and b. because it's already perfectly level so it cost less than option 2. As to the noise, I think it should be all right because it's at least 1 feet from the windows and it's my living room, not my bedrooms.

    Am I correct? I would appreciate any comments.

    Thank you!

  2. #2
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,139
    sound absorbing materials will ease viberation
    if wall bracket is used, but sounds like contractor isn't into this.

    pre fab pads take the work out of the equation.
    time needed to level ground is only work to it.

    I have my 2 ton condnesor for my split system hp
    on concrete blocks on ground with pre fab pad on top of blocks.
    (so dog won't pee on fins!)

    units are ok to leave in weather, you wouldn't need
    to put it on the porch for that. and it would be loud
    in lr.

    best of luck.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  3. #3
    Thank you for your reply!

  4. #4
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    prefab slabs work great. IF you're tight on cash, get a shovel out, make a nice 4" deep by 4' swquare space. Fill it with limestone gravel 2" above grade and tamp it down good. Now you have a very nice level spot for a precast pad or even jsut a palstic pad.

    If you're really ambitios, you can get some 2x4's and for your own pad over the gravel.

  5. #5
    Join Date
    Oct 2004
    Location
    So Cal
    Posts
    3,473
    I don't know what brand you are looking at but I have a Fujitsu inverter mini split HP for my garage & you can barely hear the outside unit running. Even standing right next to it.

  6. #6
    Thanks! 2x4 seems like a great idea.

    Quote Originally Posted by motoguy128 View Post
    prefab slabs work great. IF you're tight on cash, get a shovel out, make a nice 4" deep by 4' swquare space. Fill it with limestone gravel 2" above grade and tamp it down good. Now you have a very nice level spot for a precast pad or even jsut a palstic pad.

    If you're really ambitios, you can get some 2x4's and for your own pad over the gravel.
    Last edited by liboathfx; 02-04-2013 at 10:52 AM.

  7. #7
    I am getting a Senville 18000BTU:
    http://senville.com/air-conditioners...lle-18000-btu/

    It has a TOSHIBA compressor.


    Quote Originally Posted by precision hvac View Post
    I don't know what brand you are looking at but I have a Fujitsu inverter mini split HP for my garage & you can barely hear the outside unit running. Even standing right next to it.

  8. #8
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
    Posts
    1,018
    Quote Originally Posted by motoguy128 View Post
    prefab slabs work great. IF you're tight on cash, get a shovel out, make a nice 4" deep by 4' swquare space. Fill it with limestone gravel 2" above grade and tamp it down good. Now you have a very nice level spot for a precast pad or even jsut a palstic pad.

    If you're really ambitios, you can get some 2x4's and for your own pad over the gravel.
    How would you anchor the unit to the prefab slab? There's nothing to lag to.
    "The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
    "Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twain
    http://www.campbellmechanical.com

  9. #9
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,615
    make a platform out of treated lumber and put the legs in the ground and the screw the outdoor unit to it, wedo plenty of units this way in the areas that are just above sea level
    We really need change now

  10. #10
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,139
    If you're really ambitios, you can get some 2x4's and for your own pad over the gravel.

    I think this was supposed to say pour your own pad....?
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  11. #11
    Join Date
    May 2006
    Location
    Austin, Texas
    Posts
    279
    Here is an idea I use to anchor minisplits to preformed pads. I take 10' of all thread and cut in 4 pieces. Put a nut and washer on one end then drive through mounting flange and pad into the ground. May not keep thieves from taking unit but it is very secure from moving and turning over. Of course it helps if your not in rocky country.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event