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Adjacent bedrooms. ERV / Mini split setup

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QuintonS
QuintonS Member Posts: 45
in A-C, Heat Pumps & Refrigeration
IMG_5112.jpeg

Currently have a 9k ductless wall mounted mini split in the master bedroom. Trying to get the hot/cool air into the other bedroom when doors are closed. Do you guys think this setup would work with a vent in between the 2 rooms & set up some sort of ERV where it would pull the hot/cold air towards the farthest corner of the room? My goal is to not have to use the electric baseboard in the smaller bedroom during the winter

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,193

    You going to need two vents in the wall between the two rooms 1 high and 1 low. As far as the ERV or some type of fan or duct fan to move some air is this second floor or first floor. If SF is the attic accesable to run a duct and is the basement acesable for the first floor?

  • QuintonS
    QuintonS Member Posts: 45
    https://forum.heatinghelp.com/discussion/comment/1859472#Comment_1859472

    ok that’s a good idea doing on a vent high & low. this is on the 2nd floor, there is an attic above it with easy access.


    My other thought after doing some research was to put a Panasonic bath fan in the wall and have it exhaust into the other bedroom. Thoughts?

  • bburd
    bburd Member Posts: 1,171

    The ERV will not help; it brings in as much air as it takes out so it will not move air through the vent between the two rooms.

    I don't think high and low vents will do much either, there simply won't be enough air movement to keep that smaller room warm.

    —
    Bburd
    QuintonS
  • pecmsg
    pecmsg Member Posts: 6,277

    I don’t see how that will work at all.

    they make ducted minis for that application.

    QuintonSGGross
  • Jamie Hall
    Jamie Hall Member Posts: 26,155

    I have no idea what the ERV is for. It won't accomplish anything. However, you can get some air movement with two vents, as noted above — and with a fairly powerful fan in one of them. A bathroom fan is nowhere near big enough. I'd try it without any ducting first.

    Fans are noisy.…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    QuintonSLarry Weingarten
  • ratio
    ratio Member Posts: 4,058

    An exhaust fan (not an ERV) would take air out of the room, which would need to be replaced with air from somewhere else, like the room next door—but eventually it'll need to come from outside. You probably don't want that in the volume it'll take to keep the room comfortable.

    There are through-the-wall fans which will do what to want I think, a fan up high & an opening down low.

    Ducted heads are nice, but I don't think you want to replace the head. Also, it would need to go in the attic, which is outside the conditioned envelope, that brings in difficulties of it's own.

    QuintonS
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,193

    In the attic run a duct from 1 room to another and use an inline duct fan. Insulate the duct. The suction from the duct fan should be over the minisplit. The discharge from the duct should be as far away from the mini as possible. Add the two wall openings as well.

    Will it be perfect? No will it help, yes

    QuintonS
  • Karl Reynolds
    Karl Reynolds Member Posts: 71

    Tjernlund offers AireShare transfer fans for that purpose. Models AS1, AS1P, or AS2 depending on your application.

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