Home Improvement Stack Exchange
Home Improvement Stack Exchange

Questions tagged [mini-split]

A mini-split is a smaller HVAC unit with the blower and control unit inside a room, while the condenser unit sits outside. Use with any relevant tags (i.e. [electrical]). Use for questions about DIY installation of these unit.

143 questions
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What type of cable should I run to future-proof an outlet for an air conditioner?

Our new house is still under construction by a standard builder. After the home is finished, I will be installing a small mini split ductless AC system for a home office that will get much warmer than the rest of the house. I received permission…
ehftwelve
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Can I use an overpowered mini split to rapidly cool a space?

I have a garage/gym that I’d like to condition with a minisplit. Since I only use the gym 1 hour a day, I have the idea of cooling it on-demand instead of keeping it at temperature all the time. At the extreme, this could mean lowering the…
zed
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Can I use different wire gauges in quick disconnect and from panel?

Quick disconnect kit came pre installed with 10 gauge wire. The split AC unit calls for a 20 amp double pole (2 hots). So that sounds like 12 gauge. I realize it’s probably okay to do 10 gauge for the whole run, but it’ll be more expensive and…
MZawg
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Auxiliary gas heat for ductless HVAC

Background: I hate ducts. I hate them passionately. Maybe the dust and gunk they collect irritates my asthma. Maybe the constant rumbling, whooshing, or whistling noise drives me up the wall and prevents me from sleeping at night. Maybe my house…
Neils Schoenfelder
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Do I have room to add a 240V breaker in my panel?

I’m trying to see if I have room to add a 240V line for a mini split. The mini split I got is a Gree with nominal 9 amp pull and manufacturer recommended breaker size of 20 amps. Any thoughts on an approach? Could I use a Siemens Q22020CT2 where the…
Chris
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What should I consider when deciding between a PTAC and a mini-split?

I have built a workshop addition to my garage and both will be insulated. I'm located in Central Indiana, so we get chilly winters (often down to 0°F) and hot, muggy summers (90°F and 80+% humidity). My goal is to keep them heated to at least…
FreeMan
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120v vs 240v Mini Split Efficiency

I am under the impression that, as a general rule, 110v heating and cooling options are inherently not very efficient. So I was surprised to find a 120v mini split shopping around with a fairly decent SEER rating (22). I'm fine hiring an electrician…
grovberg
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Is a cable run through a crawl space to the exterior said to be in a wet location?

I recently installed a run for a mini-split from my panel to a disconnect box. The run is 12/3 NM-B cable from the panel, under the house in a crawlspace suspended from a rat track, through a hole in the siding to an L-fitting on the exterior, then…
hacktastical
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How to balance minisplits and oil furnace for winter heat?

We had a full set of Carrier mini-splits installed (1600 sq. ft, 2 stories, 5 heads), added to a very senior oil furnace. We're still getting used to them. We opted out of the "smart" thermostat. We used them for a couple weeks of heat. Then, it got…
J Kelly
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How to I eliminate the smell coming from my Mitsubishi mini split units?

I have 2 Mitsubishi mini split units on the 2 additions on my house. One is a Mr. Slim Inverter and the other is an Inverter. During the warmer months when I am running them in A/C mode, they frequently give off a pungent sour milk smell. It seems…
Andrew
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Do I need a disconnect switch for my mini-split air conditioner?

As the title suggests, is a disconnect switch located near the outdoor unit of a mini-split legally mandated or a convenience item? In my case, the breaker panel is about 20' from the outdoor unit, and the mini split is on a dedicated (and labeled)…
Hari
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1000-watt mini split needs 6 AWG?

If I'm reading NEC correctly, my mere 1000-watt mini splits will require whopping 6 AWG wire, for the legs from the attic junction boxes through the exterior conduit to the panel. MCA (Minimum Circuit Ampacity) per condenser nameplate: 20A Wire…
Michael Bluejay
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Verify correct disconnect installation for mini split

I am installing a 27K BTU Mr Cool min split (install guide) that requires a disconnect/shutoff. I want to make sure I am correctly wiring the disconnect, as I cannot find a wiring diagram for it and there are not good instructions with it. Here is…
r_alanb
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How do I wire a mini split that requires 208-230V with a 15A breaker, but came only with single pole wiring?

I am installing a Rovsun 12,000 BTU mini-split with heat pump. The voltage range is 208V-230V. The wiring for the unit consists of L1 Black hot wire, L2 White neutral wire, and the green ground wire. How do I wire this system to supply the voltage…
Chris
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Mini split beeping every 34 seconds

My Mitsubishi MSZ-FH09NA mini split head just started beeping. It beeps every 34 seconds whether on, off, or disconnected. This beep sounds slightly different than the on/off/function beep (quieter, a bit higher pitch, and possibly coming from a…
Evan
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