How to Install a Ductless Heat Pump | Ask This Old House
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- Опубликовано: 14 мар 2016
- This Old House plumbing and heating expert Richard Trethewey and host Kevin O'Connor install a ductless heat pump to heat and cool a room.
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Richard and Kevin installed a Mr. Slim ductless heat pump, model number MUZ-FE18NA, that provides 18,000 BTU/hour of cooling. It is manufactured by Mitsubishi Electric [www.mitsubishicomfort.com/].
Steps for How to Install a Ductless Heat Pump:
1. Calculate the heat and cooling load of the space, then order the appropriate size heat pump.
2. Mount the bracket for the indoor air handler to the room wall.[BR]
3. Use a hole saw to bore a 2 5/8-inch-diameter hole through the exterior wall.
4. Insert the plastic sleeve through the hole in the wall.
5. Attach plastic conduit to the outside of the house to conceal the refrigerant lines and electrical cable.
6. Attach the metal bracket to exterior of the house for mounting the condenser unit.
7. Run an electrical cable from outside through the wall and into the room. Connect the cable to the air handler.
8. Lift the air handler up to its mounting bracket, and feed the refrigerant lines and cable through the sleeve to the outdoors.
9. Hook the air handler onto its wall-mounted bracket and secure with screws.
10. From outside, connect copper tubing to the two refrigerant lines.
11. Run the refrigerant lines and electrical cable through the plastic conduit and down to the metal bracket installed in Step 6.
12. Snap the cover onto the conduit to conceal all the lines and cable.
13. Use a tubing bender to bend the copper refrigerant lines, as needed, to reach the condenser's mounting bracket.
14 Have an electrician run a new circuit from the main electrical panel to the outside of the house right beside the condenser.
15 Connect the electrical cable to the condenser.
16 Bolt the condenser to its mounting bracket.
17 Connect the refrigerant lines to the condenser.
18 Use a remote control or wireless clock thermostat to operate the air handler, which will provide cool air in summer, and heat in the winter.
Expert design and installation of this system was provided by NETR, Inc. [www.netrinc.com/]
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How to Install a Ductless Heat Pump | Ask This Old House
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Purchased: August 2023 - still works GREAT!I ruclips.net/user/postUgkxxsUnXhGsSJLim_XnMHyQK0u3XVaW-CGn live in a studio and during the summer it gets scorching hot - really old building with no ac units. I can’t express how EASY it was to install. This unit has been a life savior during the summer and some days during other seasons where it can still be a bit warm at night. In this small place is my friend, a husky, poodle mix and myself. We need AC - lolI don’t use the dehumidifier option - I’m not sure if it will leak in my house, since I did not install the small draining hose that came with it. May look into it late but I don’t worry about much humidity in the apartment. I don’t understand why the negative reviews since all things mentioned, I personally did not find issues with. Definitely worth it!
This old house has been my favourite since I was a young kid maybe 7 or 8 years old when Bob Villa hosted it great videos always classics keep them coming
Bob and norm the good old days
I have this kind of AC since one month now. I did almost everything myself, drilling the hole in the wall, electrical connections, hanging up the indoor unit, putting blocks underneath the outdoor unit. Then a mechanic came by to do the refrigerant work. Could have done that myself but A) My landlord wants it to be done by a certified person, B) the law requires it and C) i want it done properly so the compressor doesn't break after one year :) These AC's are really a rescue during summer time. And it can heat a room also, 4 times more efficient than a gas fired heater.
i had mine since 2012 and there hasn't been any issue so far
What's the cost to run it?
I Belice they are 8 times more efficient actually
The play/guest room is as big as the house that I grew up in!
This type of AC fascinates me! I can't believe this has been around for so long and the US is just starting to use the regularly. I think I will install these units on my home when I build it.
I very much plan to install these units when building my house.
Yea been around for years but the US is the only country that over charges for them
Heat pumps come in different sizes now. Mitsubishi makes the Zumba which can work down to -30 C, which should cover all the US. (In my house, at about -24 C, the backup heat occasionally comes on, but it doesn't do much). I definitely recommend it.
I'm in the market for this installation, and i gotta say Wow, what a clean video. Great job guys
This Old House kills Bob Villa. Love yous Guys.
I like how they carry that compressor unit up and down a flight of stairs for video purposes lol
So happy you all are adding so many videos lately! Keep it up!
+onecrazywheel This is an excerpt from a previous episode.
one crazy wheel drive
Could you PLEASE do a segment on heating/cooling and insulating a typical garage that is part of the house which has a bonus room above? The garage being used a hobbyists weekend shop (after taking cars out temporarily).
Good idea putting the receiver in the attic for a cleaner look.
very good info...thanks
Nice, sure wish it was that easy.
I love how these shows skip the difficult and problem parts.
In India, Split/Window AC is used 99% of time. We don't use centralised cooling/heating in home, though large commercial places like mall, etc uses them.
Vatsal Singh - Good to know if Im ever in India
Same in Greece
Myron Smith h
Myron Smith jnj
Old country of Iran the swamp air cooling types are most common among the residential and small commercial buildings, it perform really well due the low humidity of region and its cost, They are made of one circulating belted fan, small recirculating pump and hay bells, all contained in thin aluminum box.
I was debating on having a contractor do this or do it myself. Looks easy. Thanks for the info.
Protective HT if you followed the video. Does yours still work? If so not for long
you will need a technician to fill the tubes
@@25566 if it's a short run and you can use the tubes provided, those are prefilled with refrigerant.
good job
A hvac contractor installed it, but u had to call in a electrician to run a power wire and disconnect. The new world of hvac sub contractor.
Any and all high voltage electrical panel work is done by a licensed electrician. Do you know the difference between hi and low voltage?
Thanks for the video, was very informative. Can you please make a more detailed video regarding flaring, connection of copper pipes and electrical connections?
I found this video very helpful, it is a full install including all
of what you are looking for and more.
ruclips.net/video/JQkth-AM5CE/видео.html
wow I love it...I wish this stuff was around when I had a traditional heat pump installed....all that duct work could have been eliminated!
Wife had New Furnace put in and only Ran Exhaust Vent and Condensation pump no fresh air intake.
Awesome video and a lovely, clean installation! But why are you making the homeowner do Adam's work lol?
Where can I get one of those wireless clock thermostat? That’s really the best way to operate an ac unit. I use the remote
Nice 👍
How does the Receiver in the attic communicate with the Indoor air handler coil device? Blue tooth? Hard wired ?
Does anyone know the Mitsubishi part number for the interface kit that Richard used to view the Total Connect Comfort app on his Tablet?
Could you make review of the Sanden Combi heat pump and the Daikin Altherma 3 heat pump?
How would you compare these units to this split heat pump and to the chiller system you reviewed a few years back?
This old house knows quality and Mitsubishi is top notch. In my area Mitsubishi rules!
Manufacturer says that the back of the unit Hass to be at least 12 inches from the house. But the bracket doesn’t allow for such a clearance, only 8”.
The attic access is gonna pull heat or cold right out through the roof!
Please make an episode on how to maintain and solve simple problems with Ductless mini splits. My mini split is leaking water from the inside, I have cleaned the condenser line, cleaned the inner tray, but continue to have the same problem. Please help! Great episode!!!
it might not be flush to the wall and water is pooling instead of making it's way down the drain
make sure the insulation on the line sets are in tact
You have no down fall for the water to escape. Put a level on your unit and make sure there is some fall. Once done test it with a bottle of water to see if it leaks
Did they carry that condenser all the way up to that loft??
you know about chiller ? please tell me
Hey, the thermostat isn't making the system respond, where's the transceiver? In the attic...
This is an insanely oversized unit for that space. And on top of that the indoor unit is mounted way to close to the ceiling...
Rodney Kewken well he never said what size he used. He just said the heat loss was 18000btu. Looks like he used a 24000btu unit though. Sounds like there from Boston though. Where it gets really cold!
it is not too high , there should be atleast 10cm space from top , so its good
by the size of outside unit , this is 5kw+
Since it's variable speed, if it's 2 ton, it will run as low as about 3000 BTW before shutting off.
as low as 5 degrees outside can heat a room huh.... So how does it work exactly cause where I live in the winter, it can average -2 to 3 degrees on cold nights. Where is the "Heat" coming from if the outside is still colder than the inside of my house without the heat on?
Do they have or install these in Germany?
I need one of those at my home
It is a Honeywell RTH6580WF Wi-Fi 7-Day Programmable Thermostat www.amazon.com/dp/B00A97FIG0/ref=cm_sw_r_sms_awd_Kvy-wbJ76X649
You missed to talk about the pumping out all the air moisture from the two tubes before closing the system loop.
Seems you might be taking about system evacuation - and yeah he did miss a *very critical step* he should have evacuated the system before releasing the refrigerant by pulling a vacuum or at the very least purged with the refrigerant which is not recommended. Big f up.
Can you do a post what company sell this ductless heat pump?
These units look to be Mitsubishi.
Miss Bob Vila and his side kick
This video is almost 4 years old, is the information in it still applicable today in 2019? I'm trying to decide how to heat my garage and bonus room above it. I have an 1100 square foot garage and a 400 square-foot bonus room. Just wondering if one unit with two heads will work. And I live in the midwest where could get to 20 below zero
The right heat pump should work; I live in Canada and we have temperatures to -30 Celsius (slightly colder than what you mention). I opted for the Mitsubishi Zumba, and it works down to -30 Celsius. For my old 1950 house, at maybe -24 Celsius the backup heat turns on occasionally, but not enough that it matters much on the bill. I highly recommend it.
Neat.
They carried the outdoor unit upstairs and then back down again. Lol
Great until time to clean the back side of the coil
inverter is a technology that allows the a/c to work low medium high power not that heats during winter ....
will a ductless heat pump work for a old brick house with no insulation in the walls in zone 7. It currently has a boiler with hot water and radiators. i have access to the joists under the floors.I am thinking pex under floors would be a better option. A local hvac guy said heat pump and mini heads?
What are you using already? If it's electricity heating the water than it's a no brainer, get a heat pump. You can get some that will heat the boiler water instead of air, though it might be a little less efficient (typically the water needs to be hotter in old homes because they lose so much heat). But everyone will tell you: INSULATE FIRST, so you don't need as big of a heating system (cheaper)...
Can you hear/feel sound and vibrations from these Mitsubishi mini split condensers, when hung on the outside wall like this?
No, have one hung on my siding, they run with no vibrations and super quiet
I have the Mitsubishi Zumba, screwed right onto the brick wall. On the other side is the main bedroom and we cannot hear it.
I'm planning on installing one of these units to purposely heat my insulated garage 24x30 8' ceiling, two 8' insulated garage doors and 4 windows 32x40 inches. I live in New England.
What size unit do you recommend?
I am very pleased with my Mitsubishi Zumba ;). But ultimately it depends on what the local installers have, and their experience. The Zumba can work down to -30 Celsius though.
Is not the inside unit supposed to be at least 10 inches from ceiling? (I am just reading/watching all I can before my unit arrives for my diy installation)
Thought the same, looks too close to the cieling, think it's supposed to be at least 6 inches
You forgot to mention how efficient split systems are -for every unit electrical energy they use you get roughly 3 units of heating or cooling energy back!
Hey guys I live in California and was wondering if need any permits to install a mini split in our home
Carlos Gomez yes. Technically speaking
"Erald M.1 year agoThat's a step for a professional and not for a how to."
yes, that's another thing they didn't mention in the video.
What is the brand of thermostat? there was a segment a couple of months ago wjth a similar wireless thermostat; couldn't see the brand on that either. Thanks... Richard
It is a Honeywell RTH6580WF Wi-Fi 7-Day Programmable Thermostat www.amazon.com/dp/B00A97FIG0/ref=cm_sw_r_sms_awd_Kvy-wbJ76X649
Thank you so much!
+autexcbaty - you welcome, I hope you get it and install properly. Pay atention that sometimes we dont use the C wire and it goes inside of the ground
Forgot the most important part - what about evacuating and charging the system with refrigerant? I know a lot of these package units come precharged and you open the king valve once the line set is connected but you still need to vacuum pump the system down first. How to videos need each and every step.
Erald M. Exactly right. This video isn't for the weekend warrior. To legally open a precharged unit requires EPA certification, either a 608a universal or a 410a certification, depending on the type of refrigerant used. You aren't likely to get busted if you do it without the certification but if you do, say hello to your $25,000 fine.
shanmike11 I'm 608 universal certified and you're right, AC and refrigeration isn't a DIY job. All I was stating is if the video was trying to educate a homeowner on what's involved with an AC install, a major step was missed.
Haha I was also thinking about the vacuum process
You know I helped install one of these kits sold through a major retailer and it was labelled as DIY. The refrigerant was built-in and had pre-evacuated lines. Basically they had a pressure seal that cracked once you tightened the fittings. You could not extend the lines like this install showed, but was pretty cool to do it all yourself.
What was the brand and name of that unit?
Would have been nice if you’d have shown how to pressure test, vacuum, and charge the system.
From what i have read they come pre charged.
@@laserbeam002 Some brands like Mr Cool offer diy systems that are precharged and don’t require a vacuum pump. I could be wrong but I don’t think the Mitsubishi unit they showed is like that.
I have an older home that has baseboard heat. I live in the south and it is very expensive I can't imagine what baseboard heat would cost in the North. Have they made baseboard heat energy efficient now?
Not baseboard, but a heat pump can easily be 1/3 of the cost of baseboard, because it basically steals heat from the exterior. For each kWh of electricity, it can bring back 3 kWh of heat. The efficiency drops as it gets colder, but better units can keep going to -30 Celsius (about -28 F). The only thing is the units are more expensive, but they will pay back over time.
I liked most of the content of this video, but they completely skipped over the refrigerant requirements, I'd like to know what's involved after flaring and connecting the copper lines.
Hi everyone. I have a question about my heat pump. I have installed the heat pump and ready to wire in the 220v power and I am a little confused. The unit is a 220v but the electric indicates L and N and a ground. I am used to seeing L1 and L2 for (hot line 1) and (hot line 2) for 220v. Is L and N another way to describe the 2 hots. Thank you to anyone who can clear this up for me.
Oh that is mitsuibishi long and wide air conditioner
Will it work in Minnesota at -20 F degrees
The Mitsubishi Zumba will, it's rated to -30 Celsius (about -28 F). In my old 1950s house, around -24 C, the backup heat will occasionally turn on (it doesn't do much though since the heat pump is still working).
when you use power tool for hole use a vacuum cleaner so that dust from wall will be vacuumed before diffusing in air.
I'm an hvacr tech mechanic and installer of 34 years you did not pressurize and pull a a vacuum the most important thing's to do on an installation plus with mini split's you need to do a double evacuation.
Why a double vac?
If installation is done with good practice no need to do a double vac.
Still would like to know why a double vac?
Answer please?
@@setvencarter2752 ,
Actually some HVAC text do a triple evacuation, it means that you break the evacuation with a nitrogen pressure, then do another vacuum. It is supposed to help remove ice build up from the evacuations
Everytime i install a ductless system, once i drill my holes i nod in enjoyment justblike the tech did in this
Ross R how this systems suport two or more heads? Im wondering if i can buy 1 compressor and 3 heads inside my home to heat or cool
+ Cuauhtemoc Vega Torres - You'd have to buy an outdoor unit that's designed for use with three heads.
You don’t use torque wrenches on the flare connections?
if they only can get heat from outside to 5 degrees what happens when its below 5? no heat
yeah...his answer to it handling New England winters was weak.
sounds like a crock of shite
3:20 that head shinin Richard gud work
How do you use this system with a multiple story house?
Can have multiple mini split heads off one condenser for certain models
Yeah, except the Mitsubishi website doesn't have any prices anywhere. Totally annoying!!
normally, the problem with hanging the condenser on the exterior wall is the motor vibration will be noticeable in the living space no matter how much iso padding you use. but given there's a garage on the first floor, this will likely not be a problem in that install.
Exactly. The vibration will also be carried through the studs, floor upstairs. I've heard that mounting on a concrete pad is best, some distance from the house wall.
you are right there is noticeable vibration and sound but our homes her in uae made of concrete we put the external machine on the roof, I was thinking if it was on the floor want get damaged by the snow?
that is why we put rubber on metal holders for outside ac unit , no vibrations
Plenty of people put standard condenser units on walls and don't experience vibration issues, so I doubt this is too big of a problem. Especially if it's new construction and the walls are thick because of the insulation.
We are having a split unit installed next week (Carrier 18K BTU's). Salesman DID mention the sound/vibration issue if mounted on wall (as we wanted) so elected to go with concrete pad. Noticed in previous vids, ext. unit doesn't seem to be anchored to pad. Did I see that correctly?
So I'm guessing you should have a backup spacial heater in case it goes below 5 degrees?
The existing baseboard heat could probably be used.
Depends on the heat loss of the place, the efficiency of the pump. They make some that work to -30 C (-28 F or so). In my house, the backup heat kicks in at around -24 C, but it doesn't do much work since the pump is still going.
When / how do you fill the thing with refrigerant?
service company does it
Yeah you can’t do it your self and you can buy it but only do it if you know what your doing
Just gloss right over the vacuum down, leak test, R412a charging.. all that adds about $600. This is NOT a DIY lineset. This needs a certified AC dude to charge the systems to the correct pressure. Also that indoor head unit is WAY to close to the ceiling. You need min 10 inches (that's what she said)
nice job. looked tidy and showed some of the options that mitsi has to offer.
could have showen how to vac down the unit and witch port to open first, how to minimise the amount of the 410 when removing the gauges.
max lussi That info isn't for anyone but a EPA certified individual. $25,000 fine to open that unit otherwise.
The downside of these is you need expert install. Someday they will make an easy to self install unit. Until then I am cutting a large square hole in the wall like my dad taught me how.
Mitsubishi makes AC's & other electronics?
Yes cars, photo paper and pencils (uni-ball). They also own Nikon.
Nathan Parker
How come my LG says I have to be 12" away from a wall for the outside unit. I need to hang mine like this one, but there's no bracket availible that will give me 12" from the wall plus the unit. What's up with that??
12 inches? that's a lot! It is enough to give OU some 15cm space form the wall and some space from sides. What is important - to keep the unit clear. Not to mount it very low in order to avoid some dust, grass and leaves in the heat exchanger.
Kevin bla bla you better follow their manual. and don't panic if you can't find a bracket of the right size, even though they're out there, just go to a welding shop, and give them dimensions you need, and then brush on couple coats of paint
Odd question, does the refrigerant have to recharged periodically?
Unless there is any damage, no
Mitsubishi has heat pump that heats with up to -25c outside
They say -30 C now, the model is Zumba. I have one, and it does work below -25 C, though for my old house, the backup heat will kick in a little around -24C (it's only adding heat, not doing all the work).
A.) inverters don't magically pull heat out of cold outdoors. They just make the whole thing 10X more efficient than capacitor run units. B.) there was no mention on using a torque wrench to tighten the copper lines to the handler or condenser.
Hack job, should be at least 12 inches down from the ceiling for air intake.
Less features on that Honeywell 6000 stat than the remote control .
Can someone show me the formula they talked about in the beginning? I’m studying to become a technician and so far I haven’t been taught this.
If you buy one of these units regardless of brand, do they come with step by step instructions if you've never installed anything before except a simple window a/c? You guys did a great job but it looks beyond my ability.
Typically the refrigerant must be handled by registered people - depends what country you're in.
They didn't show the refrigerant being put into the system.
The refrigerant is already in the system from the factory.
the device you connected to the router is called a bridge... a gateway is another term for a router...
@@gregorygrimm5540 routers turn an incoming signal such as adsl/vdsl into a signal such as ethernet... gateways do the same. bridges connect a device pon a different type of connection, such as bluetooth, IR, or RF.
I just purchased a Mitsubishi Heat pump and AC unit. I am in the process of setting the pad outside on the ground. In the episode where you installed the Mitsubishi system in the upstairs of the garage you did not state what size unit you installed for a 700 sq. foot living area. What was the BTU rating on this system? I have a shop with 758 Sq. feet with a 9 foot ceiling, insulated and it has 5 windows. The unit is 18,000 BTU -- What are your thoughts?
Stephen
Stephen Cohen 600sqft per ton. 12,000btu's per ton... with your windows and space, I would say a 1.5t system... 18k BTUs sounds work great for you.
Mike Katz More shit advice. A proper load calculation should be done for unit sizing, not just licking your finger and holding it up to see which way the wind blows. You need to stop "helping". You don't know what you are talking about.
Can someone explain how this wi-fi controller did replaced the original remote control?
What is the app for this, and how can you set cooling/heating mode or desired temperature via this?
Stilios Honeywell's Remote Equipment Module and a Red Link Gateway with a TH8321WF or a Lyric Tstat.
By making the entire system unreliable and unsecured by turning it into a part of the the Internet of Things
Stilios the wifi thermostat is literally pointless for this thing. The remote is wireless and is the thermostat for the unit. So if you put the remote down the hall your unit will run until the temp around the remote is what its set at.
did you have to do a nitrogen purge? or were the lines prefilled with nitrogen?
I believe you have the evac the lines always. They did not cover that. I'm installing one of these myself but I know there are techs that do this all day long you can throw $100 their way and they will do it for you, possibly even flair the lines.
Roger Sanchez lines are usually always filled with nitro from manufacturer. And any good installer always pressure tests the line set with nitrogen to check flare connections before pulling a vacuum. And we'd charge way more than $100 to flare out your fittings and pressure test it... how are you going to charge the system?
Mike Katz Wow, you just love to hand out shitty info.
Actually was correct. Just didn't go into details. Any tech worth a darn will pressurize and do a PROPER evac. Not going to list every detail find a PROPER video.
purging can be done by opening discharge line and purging through suction line.. hence no need to do vacuum. all is depend upon expertise of the technician.
Naieem shaikh flat out lie. You are destined for failure if you attempt this.
Good job
I am a.c Technician
I see that there is baseboard heat.
Don't see the use of a torque wrench. Installers must have really calibrated hands and arms to know what 25-30 ft lb feels like....
Too bad they missed the part in the installation instructions that say the unit needs to be 10" from the house.
Maybe on some models, not on the Zumba, probably not on this one.
@@stephaneboisjoli1320 most likely incomplete instructions then.
Why would you keep adding soo many different heating options to just any extra space like that. It already has 2 different heating types for the space
Cost of operation.
Hi
i have a samsung digital inverters (3) one in my living/dining/kitchen; one in my back bedroom; one in the other back bedroom. my house is approx 900 sq feet. i live near the ocean in the south. i had alot of trouble when i first moved in using the ac (i have lived in this house that was completely flipped almost 2 yrs) it leaked constantly. the ac company that installed it came back over and over for about a year then stopped. no solution no correction. i called another company they came out and apparently the board in the unit in the living room/dining/kitchen because of leak burnt out. the tech that came removed it and a new one was ordered and it was replaced. they will come back in the summer because of the temps they cant check it for leaking. now we have had very very cold weather the past week frigid temps which are unusual but it is not heating. it comes on then randomly goes off then comes on. my house is cold to say the least.
i did not choose these units i preferred the conventional ac/heat unit but the flipper chose this.
do i need to get an additional heating unit or is there something else i can do or maybe i am doing wrong.
if an additional heating unit is needed what is suggested.
i am very very dissatisfied with this system.
thanks for any suggestions.
WAIT A MINUTE! You skipped how the system gets charged...... Do you have to add refrigerant? Does the system come with that? Does a licensed person need to do this work? Without refrigerant the system is worthless.
Could you clear up the previously asked question below?
Forgot the most important part - what about evacuating and charging the system with refrigerant? I know a lot of these package units come precharged and you open the king valve once the line set is connected but you still need to vacuum pump the system down first. How to videos need each and every step
2:47 As he admires that he knows how to drill.
You forgot to pull a vacuum on the system
purging can get you fined, it has to be vacuumed and touching any refrigerant without a license after 2018 will cost you as much $32,500
that system come pre-charge, so you only have to do the connections and open the valves...
@@25Lestad
4:45 looks like normal compression fittings, plus they cut the copper at the condenser so it is full of air like the evaporator
also, regulations say even connecting lines or gauges requires a license when there is the chance of a leak occurring for any greenhouse gas
Hector Hernandez Please get out of the HVAC industry if your in it. There is AIR IN THE LINE SET, it MUST be evacuated before the refrigerant is released into the lines from the condenser, where yes it is pre charged generally in split heat pumps like this. But damn, VAC ALWAYS!
@@user-ul5gi9yw9t dumbass get out of the industry yourself. The lines come precharged in these systems
it's too closed to the ceiling, leaving not enough room for air return, a minimum 6" from the ceiling is recommended by manufacturer.
Not true. It’s 2” minimum.
Eric Rasberry just installed a 4 zone lennox mini split, they recommended 6" minimum from ceiling
Why did they carry the heat pump upstairs inside only to have to carry it back downstairs to install it outside????? lol
what about the gas you said not a thing about that
This is completely electric and no gas is required as it is NOT a furnace. It uses a heat pump.
Ryan Toomey by gas he means the refridgerant, the thing that can only be done by a professional