GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Maximize Single Head Heat Pump

user-6828388 | Posted in General Questions on

I recently had two 15k cold weather rated heat pumps installed on each side of a  side by side duplex. The single head is in a small 10 x 10 kitchen with a single doorway leading to the living room. The kitchen gets very hot if we set the heat pump to 80 it will get up to that temperature but the adjacent dining room is barely getting up to 65 degrees.  The dining room also has the stairway to the upstairs. We have done a lot of air sealing in the attic and plan to bring it from 3″ of loose mineral wool to R-60 with cellulose, which should help a bunch. Regardless, I’m still concerned as the weather is much more mild right now and there are still cold spots in the home. 

We did a manual J on the building and this heat pump is sized appropriately. 

I know there has been prior discussion on these forums that transfer fans don’t work that well because the delta T is not great enough and/or the cfm are too low.  Usually the discussion talks about HRV type fans or bathroom fans. 

I still need to try to minimize the use of backup heat in this home. I’m thinking about the following options:
-Get a large whole house fan in the wall blowing air from the kitchen to the dining room. I’ve looked into fans that can move 1,000 to 2,000 cfm. 
-Open the area on top of the doorway and somehow box it in to look like an open window.
-open up the top half of the wall (kitchen sink is on the lower half of the wall between the two rooms).
-Cut a hole in the ceiling of the kitchen to act as a cold air return from upstairs to complete the conductive loop.

I don’t want to buy another mini split. I just want to maximize what is there and minimize the electric resistance heaters.

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. walta100 | | #1

    Now that it is spring time it will be hard to diagnose the problem.

    But when two rooms are very different temperatures it seems most likely lots of heat must be escaping from the cold room more quickly than heat is entering the room.

    Seems like this would be a good room to have inferred photos taken. Home Depot rents the cameras at 1200 location but you need cold weather to see the problems.

    https://www.homedepot.com/p/rental/FLIR-COMMERCIAL-SYSTEMS-INC-Thermal-Camera-FLIR-i7/309006981

    Walta

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |