Internet #300696557

Model #DA1821-H2

Store SO SKU #1002193634

21 SEER 18,000 BTU 1.5 Ton Wi-Fi Ductless Mini Split Air Conditioner and Heat Pump Variable Speed Inverter - 220V/60Hz

  • Energy Star 21 SEER Yields Ultra-High Cost Efficiency
  • Wi-Fi capable (module included)
  • Equipment should be sized/installed by a qualified professional
  • See More Details

Frequently Bought Together


Product Overview

The 18,000 BTU 1.5 Ton 21 SEER AHRI and Energy Star Certified DuctlessAire Mini Split Air Conditioner with variable-speed DC inverter compressor provides a highly efficient, quiet, low-cost professional solution for your cooling and heating needs without requiring any ductwork. This energy-efficient system is the ideal solution for open-room applications up to 900 sq. ft., such as classrooms, sunrooms, open floor plan flexible-use spaces, man caves, home theaters, offices, studios, bedrooms, bonus rooms over the garage and even basements and garages where heating and cooling is desired. Where there is an open interior space need for heating and cooling, DuctlessAire Mini Splits have the answer. This sleek-looking unit is mounted on the wall, working in concert with an exterior condenser requiring only a small hole to run the lines from the air handler to the condenser. The fans deliver continuous airflow and circulation with year-round temperature comfort and are easily adjusted with a remote control that comes standard with each unit. Because the air handler is mounted above eye level, it is aesthetically attractive, blends well and does little to impede with furniture and decor placement. DuctlessAire Mini Splits are a cost-effective alternative to central HVAC systems and can be installed in just a few hours.
  • 21 SEER rating Energy Star certified: estimated national average annual operating cooling cost is $108 based on AHRI certificate #9150139
  • Package includes: stylishly designed interior white wall-mount air handler with LED display; exterior pre-charged condenser with special golden anti-corrosive coating coils; wireless remote control for customizable airflow and temperature adjustment; 25 ft. complete kit
  • 25 ft. kit includes: copper tubing with insulation and nuts, control wire, 6 ft. drain hose, wall sleeve, wall sleeve cover and tape
  • Electroplated coils: the electroplated hydrophilic coils improve heating efficiency by accelerating the defrosting process; the unique anti-corrosive coating on the coils also aids in withstanding the effects of salty air, rain and other corrosive elements by allowing contaminated water on the coils to run off more quickly, reducing the corrosive effect to the coils; heat exchange performance is much longer lasting
  • Low ambient operation: a special built-in low ambient kit can be used in temperatures as low as 5°F for cooling operation, useful for users who need to maintain cooling during winter
  • Refrigerant leak detection: with this new technology, the system will alarm when a refrigerant leak is detected
  • Dual sensor fixed or remote: by switching to remote sensor and keeping the remote close to you, you tell the air conditioner to set the temperature from wherever the remote happens to be, this counteracts the tendency for the air conditioner to stop cooling or heating because the air around the unit has reached its set temperature (switches off after period of inactivity to preserve battery life)
  • HEPA filter included (1): a HEPA filter is a type of mechanical air filter; it works by forcing air through a fine mesh that traps harmful particles such as pollen, pet dander, dust mites and tobacco smoke
  • 2-direction air vane technology: in cooling mode the air vane opens counterclockwise to direct air horizontally, allowing for an even cooling effect; in heating mode the air vane opens clockwise, directing air downward, this time for a uniform heating effect
  • Built-in electronic diagnostic: monitoring some abnormal operations or parts failures, microcomputer of the air conditioner will switch off and protect the system automatically; meanwhile, the error or protection code will be displayed on the indoor unit
  • Outdoor pan heater: a heating belt is fitted on the base plate of the outdoor unit to avoid accumulation of rain, snow or water on the base plate
  • Dual washable filters: a good air conditioner should not only take care of the temperature in your home but also the quality of the air you breathe; the system aids in removing most of the pollen dust, smoke and other microscopic airborne particles that by latest thinking contribute to respiratory problems like asthma and hay fever
  • Self-cleaning: by pressing clean on the remote control, it automatically cleans the evaporator to aid in reducing buildup of bacteria and keeps the air fresh
  • Sleep mode: in sleep mode, the unit automatically decreases the heating or increases the cooling by 1° per hour for the first 2 hours of use, then holds the temperature steady for 5 hours before ceasing
  • Low noise airflow system: without decreasing the airflow volume and capacity output, the large-diameter cross flow fan can bring down the indoor unit noise level by lowering the fan speed
  • Anti-cold draft: if the unit is turned on in heat mode when the ambient temperature is low, it will warm up prior to fan operation to prevent cold air in heating mode
  • Louver position memory: the set louver position is stored in memory by the microcomputer and the louver returns to the stored position when the next operation is performed
  • Turbo mode: this function enables the unit to reach the preset temperature in the shortest time
  • Energy Star 18,000 BTU 1.5 Ton Ductless Mini Split Air Conditioner and Heat Pump Variable Speed Inverter - 220-Volt/60Hz
  • Click here to learn more about Eco Options and Energy Efficiency
  • Which type of air conditioner is best for your home?
  • "Find out more about installation:

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Info & Guides

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21 SEER 18,000 BTU 1.5 Ton Wi-Fi Ductless Mini Split Air Conditioner and Heat Pump Variable Speed Inverter - 220V/60Hz
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BTU Cooling Rating18000 BTU24000 BTU18000 BTU18000 BTU
BTU Heat Rating18000 BTU25000 BTU18000 BTU18000 BTU
Voltage (v)220v220v230v230v
Zone CapacitySingle ZoneSingle ZoneSingle ZoneDual Zone
Minimum Outdoor Temperature (F)-13-13-13-13
Mount LocationWall MountWall MountWall MountWall Mount
IncludedHeater,Remote Control,Self-diagnostic toolsHeater,Remote Control,Self-diagnostic toolsHeater,Remote Control,Self-diagnostic tools,Support BracketsHeater,Remote Control,Self-diagnostic tools,Support Brackets
Coverage Area (sq. ft.)9001200900900
View ProductView ProductView ProductView Product



Air handler depth (in.)
Air handler height (in.)
Air handler width (in.)
Condenser depth (in.)
Condenser height (in.)
Condenser width (in.)


Air Conditioner Product Type
Mini Split Unit
Air direction/circulation
Air handler weight (lb.)
Amperage (amps)
6.82 A
BTU Cooling Rating
18000 BTU
BTU Cooling Rating
BTU Heat Rating
18000 BTU
BTU Heat Rating
Color Family
Condenser weight (lb.)
Coverage Area (sq. ft.)
Decibel (Sound) Rating
34 dBA
Decibel Rating
34 dBA
Filter Type
Heater,Remote Control,Self-diagnostic tools
Line Set Length (ft.)
Mini Split Features
Auto cool,Automatic shutoff,Fan only option,Overload protection,Sleep setting,Sleep setting,Timer,Timer,Wireless remote control
Minimum Outdoor Temperature (F)
Mount Location
Wall Mount
Number of cool settings
Number of Fan Speeds
Voltage (v)
Voltage (volts)
Wattage (watts)
Zone Capacity
Single Zone

Warranty / Certifications

Certifications and Listings
ETL Listed
Manufacturer Warranty
5/1 year Compressor/Parts (Registered)
Seasonal Energy Efficiency Ratio (SEER)

Questions & Answers


Is the lineset for this unit 3/8 or 5/8?

Asked by Zl February 25, 2021

Liquid Line: 3/8"; Suction Line: 5/8"

Do i have to operate this unit thru remote control? Can i have a wall panel instead or in addition?

Asked by Seid February 23, 2021

The unit can have a wired thermostat. I have also heard many say they mount the remote control on the wall as well.

I plan on installing this unit in my basement. Does it have a dehumidifier setting?

Asked by Jim February 18, 2021

No, but it works as a dehumidifier the whole time it is running. I have a meter my house now stays under 50% less in the winter. It does pull a lot of moisture.

Is there any type of vacation mode? Sounds like the lowest heat temp is 62, wondering if there's ...

Asked by Zach February 11, 2021

When in the HEAT mode you can activate "Freeze Protection" which will maintain a temperature of 46f. To do so, you will press and hold the silence/FP button on the remote for about 3 seconds or until the indoor unit display "FP". The FP function can only be activated during the heating operation(only when the setting mode is HEAT). Press the buttons of ON/OFF, SLEEP, FP, MODE, FAN SPEED,UP or DOWN while operating will cancel the FP function.

What gauge wire should I purchase? I assume it should be 20 amp and a 20 amp breaker?

Asked by JeffH February 10, 2021

Your electrical contractor would be the one to make that determination.

Do you install? And how much.

Asked by Kent January 28, 2021

I did install myself, but I don't desire to do it for anyone else.

Can someone post a picture of the nameplate for this unit?

Asked by Jay January 28, 2021

I believe you had a 9000 BTU Unit? Can’t find that now.. No?

Asked by Rj January 27, 2021

Do you have to have WiFi on. Can you cut WiFi off?

Asked by Gusit January 26, 2021

The hardware for the WiFi is in the form of a USB stick that plugs Into a socket behind the front panel. You can remove the USB stick and the unit works fine without WIFI.

Does the inside fan turn off at the time when the room reaches the set temperature and the compre...

Asked by Max January 25, 2021

When the unit is in use, the inside fan continues to run until you turn the system off. You can set the fan speed from low to high but to be honest, you can not hear the inside fan no matter the speed. Additionally, you can not hear the outside unit inside the park model (my chair is within six feet of outside unit) unless you are outside and within fifteen feet of the heat pump.

21 SEER 18,000 BTU 1.5 Ton Wi-Fi Ductless Mini Split Air Conditioner and Heat Pump Variable Speed Inverter - 220V/60Hz - page 2

Customer Reviews

  • 4.9
    out of 886 reviews
  • 98% recommend this product
Filter by:
Showing 1-10 of 886 reviews
Overall, I am very happy with this mini split system. It is a great value considering the higher ...
Overall, I am very happy with this mini split system. It is a great value considering the higher quality and energy efficiency, which makes it eligible for a $300 federal tax credit. Support from Ductlessaire is also outstanding. My only reasons for not giving 5 stars is that I would have preferred 16' lines instead of 25'; I am concerned that there may not be sufficient protection of the fins on the outdoor unit as the openings on the side and back of the case are quite large; and because my outdoor unit had some minor cosmetic damage. Everything was packed very well in four boxes on a pallet. Home delivery worked out great. Overalll, I am very happy and would recommend this mini split.
by Whyarenicknamesrequired
Second ductless for me
Owned one for over two years now I bought another for a production room that needs cooled. Simply runs out, easy install. If I need another I can’t see myself buying another brand. Efficiency and noise reduction for great value. Yes they offered a free second remote and extra filters for my review but product deserves a good review either way. Thanks ductless for a good product. Really dislike Home Depot but they offered the unit at a competitive price and shipping.
by Cannapro
Our new DuctlessAire 21 Seer 24,000 BTU went in without one problem, the unit was delivered by Ho...
Our new DuctlessAire 21 Seer 24,000 BTU went in without one problem, the unit was delivered by Home Depot to our house by Estes shipping and was flawless and that is always a concern but Estes trucking get a 10 out of 10. The new DuctleeAire system again went in without one problem, I had to cut and re-flare the lines but I have had years of experience with line sets and hhydraulic tubing so this was very simple and having the right tools is a must to re-flare the lines to get a perfect fit and no leakage of freon. I followed all the instruction provided by DuctlessAire and they really had it spelled out with evey detail needed. The system works perfect and we are enjoying the heat during these record lows for Missouri and the blower is very powerful and provides a good range in the addition it is installed in and provides extra heat to the ajoining rooms. We have had the unit installed for 2 weeks now and we give our new DuctlessAire System a 10+ and we are looking at many years of a comfortable living space with air conditioning or heat!!
by HomeDepotCustomer
3 people found this helpful
Absolutely love this unit.
Everything you could want from a mini split except for the fact that it does not have a room temperature display. That would have made it easily five stars.
by Stanpoulan
1 person found this helpful
We decided to close out our rental storage and install new shed. We wanted our belongings to have same environment as before and after healthy search decided on this Ductlessaire 12k m 21 SEER 12,000 BTU 1 Ton Wi-Fi Ductless Mini Split Air Conditioner and Heat Pump Variable Speed Inverter - 220V/60Hz mini split to cover 16x20 outdoor shed. PERFECT choice !! Unit covers it super nice, is very attractive both inside and outside (even since its a shed). It covers super fine in both cooling and heating needs with easy of operation. For being a ROOKIE on installations I certainly recommend Ductlessaire mini-splits and appreciate HomeDepot handling incoming product arrival with care.
by Mw
2 people found this helpful
Good product, no wifi module as listed though
Unit appears to be well-made and installs easily enough. Very pleased with how quiet and efficiently it runs. Overall footprint is minimal inside and out, and for the price, this mini-split is a great choice for a garage or shop. The remote control is nice, though it doesn't really transmit from the listed distance of 24ft (8m). More like half that distance if it's mounted on the wall with the included holder. Time will tell on the longevity of the remote and the unit overall. My chief complaint would be that the Home Depot listing for this product very clearly says (at time of purchase) "WiFi module included." Unfortunately, this is not the case, and I've deducted one star from the overall rating because of it. Was really looking forward to the ability to turn this unit off and on from my house so that the shop was warm when I needed it. Yes, you can program the remote to turn itself off and on, but only on a schedule, not "as-needed." I'd still recommend purchasing this item, but HD needs to update the listing to reflect what is actually included with purchase.
by Rymeaux
2 people found this helpful
Ductless Aire 24,000BTU - Great Unit!
This is the first Mini Split system I've owned and so far it seems to be a great unit. It is extremely quiet, can hardly tell its running. The air flow and oscillating louver make the airflow seem natural. I really like the DC Inverter drive outdoor unit and it efficiency. The way it adjust to the needed load while maintain very very low vibrations and noise transmitted through the wall mount bracket. I ordered this in advance of a new garage construction and couldn't get it installed right away. My only complaint is the heating temperature cannot be set lower than 62*C, I installed it in a new garage construction that is well insulated where I wanted to turn the heat down to about 50 at nights and when not in use. But now that it is installed, I am really glad I went with the Ductless Aire Mini Split Heat/Cool system
by Tony
2 people found this helpful
Great Buy
This is by far the best unit for the money. I purchased a 18000 BTU Mini Split AC Heat Pump from Home depot and it is the most efficient and quiet unit I had seen in years. When the system is on outside and running in my sunroom I cannot hear it at all. It is easy to go to sleep and not be disturbed by noise. I will recommend if you are looking for unit to covet 500-800 sq. ft. and it warms and cools just like my central unit, buy this unit and you will be very please.
1 person found this helpful
Performance of the DuctlessAire MiniSplit system is great!
I am very pleased with this Model DA1221-H2-1 mini split system. It is very quiet, and performs flawlessly.
by Ductlessphil
Ductless Aire 18,000BTU
Just purchased and installed this unit. Great price,easy to unstall if you have some mechanical skills. Everything needed included ( electric breakerbox, brackets,
by Timo
Showing 1-10 of 886 reviews