Minisplit head: Max height
![](https://secure.gravatar.com/avatar/373c1f179d404168e1dad887c624e9a2?s=52&d=https%3A%2F%2Fimages.greenbuildingadvisor.com%2Fapp%2Favatars%2F200x200%2Fy.png&r=g)
Any recent information on the subject of head heights? Found a couple old discussions …. The general lack of reliable information in the HVAC industry is amazing — mini-splits especially. I’m not new to using them in my personal projects — but, I have an odd situation with my current project. When does it get too high
I have a two story addition at the back of my current project — the upper level is the kitchen w/ cathedral ceiling (lots of windows) — large three sided stairway down to a lower level bathroom/ entryway. The building is basically two large rooms open on three sides with walk out doors at two levels Have decorative/ functional collar ties that get in the way if I mount at what I figured was about ideal … 8.5′ (bottom of unit)
Looks like I will be pushing 10′ or more as in the included picture — this would be a Mitsubishi 18k hyper. My fear is if I go too high even angled down it’s going to throw all the air down the steps. Also — pushing supplemental heat from that height
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb1.png)
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb2.png)
Replies
Well you should certainly use a remote sensor (you have several options from Mitsubishi) to make sure the unit references temperature at the occupied level rather than the return inlet.
Also I have a FH and it won't hold max down angle on the vanes in cooling. It reverts to a higher position eventually. I think this has something to do with condensation on the vanes.
It's hard to picture what you're taking about regarding the stairs.
Perhaps you could install a slim duct unit vertically against the wall and use a minimal amount of duct work to get good air distribution that you're concerned about.
You have to install the unit in a way that is serviceable for filter changes and occasional cleanings.
How do they do the remote sensor.
The picture showing the wall with the mini is the back wall of the existing structure --- the sketch-up is showing the new addition and thats all the windows and the stairs.
I had not noticed the head not staying down .... I typically leave them on the eye setting where it avoids people .. or the natural. They work so well -- I rarely pay with them