Split AC sizing in a 5 story
I’m going to use Fujitsu mini splits for my 5 story building. It is 20×50 with 2 party walls. How much ac do I need per floor? I was told 3 tons for the top floor and 2 tons for the others. Does this seem right?
I’m going to use Fujitsu mini splits for my 5 story building. It is 20×50 with 2 party walls. How much ac do I need per floor? I was told 3 tons for the top floor and 2 tons for the others. Does this seem right?
How do you like the Halcyon. I just bought a 3 ton unit. I was thinking of getting one for each floor (3 tons for the top and 2 tons for the other floors).
How do you like the Halcyon. I just bought a 3 ton unit. I was thinking of getting one for each floor (3 tons for the top and 2 tons for the other floors).
cmu is right. There are too many variables to consider besides “top floor”.
I have a Fujitsu Halcyon system here. I have two heads upstairs, one in my office and one in the master bedroom. They keep all four rooms cool so long as the doors are open, and the downstairs tolerable as well so long as its under 90 outside.
Don’t buy the unit that can’t go below 78! Wrong place to save.
BTW – what are the ceiling heights – 1.5 – 2 feet higher can add a large percentage to the volume to be cooled.
Our top floor of a 20×50 9′ ceilings and rock wool above the ceiling: 1 window unit in the front big room (bedroom – south facing)12,000 – rear big room (north) 10,000 and 5,000 each in each of the small rooms off the hall – front and rear. The bath and halls are not cooled. If you are going for a central cooling concept – seems to me that the 3 ton for the top floor is correct.
That being said, definitely get a heat-load calculation done.
You can’t estimate. Get a heat-load calculation done (which has a built-in conservatism itself) and insist on that or lower. Never higher. See http://www.oikos.com/esb/50/manualj.html
Offhand, 3 tons for a floor seems high. Without any roof insulation, we have 2 8k window units on the top floor and it’s tolerable…that’s 1.3 tons. Minisplits should be similar because you’re not conditioning the entire space, just where the units are.
But then, we keep the temp at 78. So if you want to save energy, the planet, and initial costs, keep the thermostat high and the capacity low.