Questions tagged [mini-split]

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Mini Split Condenser wall mount on wood exterior wall

We have a wood-frame house with 2x4 studs and half-inch plywood exterior walls. What is the generally accepted best practices for mounting a 80lb mini split condenser on a wall bracket to this type of ...
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1answer
41 views

Mini Split liquid line shaking

I just installed a new Mr. Cool system a few weeks ago. Works great, its quiet and works as expected. I haven't finished the lineset covers since the routing is a bit wonky so I was able to see the ...
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2answers
70 views

New mini split ac on existing Spa disconnect

I'm installing the mini split and wiring it to the disconnect they had for a spa which is now long gone. They wired a 110 gfci off the disconnect which I'm not touching. Coming in from the main ...
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0answers
68 views

Does cabling between a mini-split indoor and outdoor unit need conduit?

I am installing a mini-split AC system where there are multiple indoor units connected to a single outdoor unit. For each indoor unit, there is a separate 4-conductor cable that connects to the ...
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1answer
41 views

AC Condensate Line Location - Outside vs Inside

I'm installing a few mini-split AC units in my house, and I'm trying to determine the best place to run the condensate line. Right now it's either between running it outside with the line set and tray ...
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0answers
29 views

split system air conditioner condensate hose

I need to buy and install a split AC and I have a small issue. The AC has two copper pipes for refrigerant gas to flow through and one hose to eliminate condensation water, and normally, the hose ...
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1answer
55 views

Ductless AC Initial Charge

I just purchased an LG mini-split set: 18,000 BTU indoor unit https://www.supplyhouse.com/LG-LSN180HSV5-18000-BTU-Ductless-Standard-Multi-F-Air-Conditioner-Inverter-Heat-Pump-w-Built-In-WiFi-Indoor-...
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0answers
605 views

Daikin Mini Split Runs Constantly

We had a Daikin ductless system installed as a replacment for our old system that finally died. We have 4 total units inside the house, with 1 in each of the 3 upstairs bedrooms and a larger 18K BTU ...
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2answers
84 views

Is there harm in using my mini-splits in conjunction with my hot-water baseboard heat?

My new house has a natural gas boiler with three zones of radiant baseboard heat (one per floor). It also has a mini-split system (again one head per floor). The mini-split was advertised as air ...
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1answer
486 views

Condensate pumps for mini-split system within attic; is this the best location?

We had a Gree mini-split system installed in our condo located in the SF Bay Area in 2016. Since the location of the 3 units (both bedrooms and living room) are not mounted on external walls, ...
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2answers
733 views

Possible to drain mini split into clean out opening?

I have a mini split in a bedroom that was set up so the condensed water drains via a plastic hose into 5 gallon bucket in the cellar. There is no proper drainage in the cellar so periodically I have ...
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0answers
62 views

Mini-split HVAC in new build?

Next few weeks I will be in the process of getting quotes for mini-split HVAC system. Curious, if anyone has gone ductless and if so, how is that working out? The house will be a a two story build(...
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1answer
147 views

Fusible plug blew on mini-split A/C, how to fix?

I have a 2005 Mitsubishi mini-split that has been working OK but blew the fusible plug (on the low side just before compressor) this winter while it was in heating mode. Now I'm wondering what to do. ...
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4answers
851 views

Mini Split Condenser in Garage? With ventilation?

I live in a fairly warm and dry environment and due to HOA restrictions am unable to place a window A/C unit, outdoor unit, or a system on the roof. I understand that A/C shouldn't go in attics due to ...
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2answers
40 views

Can ductless air conditioning+heat pumps work well on floors that have doors closed?

Our home is a split level, with 5 floors - basement, den, kitchen, bedroom, master. Each of those floors is mostly open EXCEPT the bedroom floor, which is 4 separate rooms. A HVAC contractor we got a ...
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1answer
50 views

Ductless MiniSplit Install Resources

I'm installing a multizone ductless minisplit in my house. Many of the items I need have already been purchased, I have not purchased: Line Sets Nitrogen Testing Tank 410a Refrigerant I'm ...
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1answer
2k views

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 ...
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4answers
13k views

Sizing circuit for mini split heat pump

I'm getting ready to install the Mr Cool DIY 24K Mini Split Heat Pump in my garage. https://www.homedepot.com/p/MRCOOL-DIY-24-000-BTU-2-Ton-Ductless-Mini-Split-Air-Conditioner-and-Heat-Pump-230-Volt-...
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1answer
42 views

Forced hot air and mini heat pump

I recently bought a house and I have forced hot air currently. It works fine, the only issue I have with it is that it constant turns on and off. I've been looking into mini heat pumps and they seem ...
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2answers
1k views

Mini-split vs gas boiler for heating

I recently had three mini-split heads installed, two downstairs and one upstairs, primarily for A/C. These are Mitsubishi units, rated down to -15C (or perhaps F, but it doesn't really matter for my ...
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1answer
350 views

Replacing thermostat on Sanyo mini split

I have an old Sanyo KMH 0922 mini split. The air conditioning seems to work OK. Last winter on heat it was either on or off the thermostat wouldn't control the temperature correctly. This ...
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5answers
4k views

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 ...
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1answer
507 views

Best foam for copper wiring insulation in split-unit A/C?

I went to home depot to buy foam insulation for my A/C split unit inverter. It's to cover the copper wire (and other wires) that go from the inside unit (in the room) to the outside unit (in a roof ...
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0answers
115 views

What is causing that buzz when running my mini-split air conditioner?

There is a short buzz noise that emanates randomly while running my GREE mini-split air conditioner. At first I thought it occurs only while running one of the 3 units, but it seems to occur when ...
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1answer
106 views

Ductless Mini Split System for Cooling, Heating, and Dehumidification [closed]

I have a 22x24 foot building that I'd like to heat, cool, and dehumidify in East Texas. I'm specifically interested in purchasing a ductless mini split system to achieve this, but I have the ...
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1answer
5k views

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, ...