Mini-split for Phoenix, AZ duplex?
I’m Ben and I’m new to GBA. Well, I’ve been reading lots of articles here and searching the Q&A, but this is my first post.
I recently purchased a duplex in downtown Phoenix, Arizona. It needs pretty much a total rehab. Most of the flooring needs to be replaced due to water and/or termite damage. This gives me the opportunity to seal the crawlspace if I want. Luckily, the exterior walls are all concrete block, so no terminte damage there.
My main question is about the cooling load for the place. It’s primarily two main rooms. One is a combined kitchen/dining/living space with no doors, and a separate bedroom with a door. I’ve run the calculator at: http://www.loadcalc.net/load.php and it says I need about 8500 btu/h cooling for each unit. Each unit is about 540SF. I used an outdoor temp of 122 and an indoor temp of 78 for the calc.
I’ve seen other calculators that give a much higher number.
If I install a 9000 btu/h unit, how do I get the conditioned air into the bedroom? I feel like I should install a 9+9 mini-split with a head in the front and one in the bedroom.
Each unit has about 80SF of windows and 38SF of exterior doors.
The west side of the building has a large shade tree shading the west wall and a good portion of the roof.
Outdoor NG on-demand hot water heater
Lots of insulation above the ceiling
PEX water lines
GBA Detail Library
A collection of one thousand construction details organized by climate and house part