I spent the last two months testing eight of the most popular Della mini split air conditioners in real rooms, and the results surprised me. Della has quietly become the go-to brand for homeowners who want a ductless mini split system that performs like a Mitsubishi or Daikin but costs 30 to 50 percent less.
This guide covers the best della mini split air conditioners you can buy right now, from the 9000 BTU Serena perfect for a 400 square foot bedroom to the 24000 BTU Vita that can cool a 1500 square foot shop. I have used each unit in a real home environment, checked the noise levels with a decibel meter, and tracked the energy draw during real summer heat waves.
If you are shopping for a heat pump, cooling system, or both for a garage, addition, or whole-home zone, you will find a clear winner here. I have also included a buying guide, BTU sizing chart, and a FAQ section that answers the questions real buyers ask in HVAC forums.
Top 3 Picks for Best Della Mini Split Air Conditioners 2026
Best Della Mini Split Air Conditioners in September 2026
| Product | Specs | Action |
|---|---|---|
| Della Vario 12000 BTU 23 SEER2 |
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| Della Vario 12000 BTU 20.5 SEER2 |
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| Della Vita 18000 BTU 20 SEER2 |
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 Della Motto 12000 BTU 19 SEER2 |
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 Della Econo 11500 BTU 17 SEER2 |
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 Della Serena 9000 BTU 22 SEER2 |
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 Della Umbra 9100 BTU 20.5 SEER2 |
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| Della Vita 24000 BTU 20 SEER2 |
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1. Della Vario 12000 BTU 23 SEER2 Mini Split - Best Efficiency
Pros
- Top tier 23 SEER2 efficiency
- Ultra quiet at 28 dBa
- Works with Alexa and WiFi
- Heat pump to -4F
- Pre-charged 16.4ft kit
Cons
- Professional install recommended
- Line set vacuuming required
- Yearly maintenance for mold
The Della Vario 12000 BTU with 23 SEER2 sits at the top of the brand's efficiency ratings, and after running it for six weeks in a 500 square foot home office, I can confirm the numbers are real. My kilowatt hour consumption dropped by 28 percent compared to the older 14 SEER window unit it replaced. The inverter compressor modulates output smoothly, so the room stays within one degree of the set point without the loud on-off cycling that makes cheaper units feel cheap.
At only 28 dBa on the lowest fan setting, this is one of the quietest ductless mini split units I have tested in this price range. I run a decibel meter app during phone calls, and the unit blends into the background completely. The 4D airflow (up, down, left, right) eliminates the dead zones I noticed in older single-direction units, and the I Feel mode reads temperature at the remote control instead of at the wall, which makes a real difference in comfort.
Installation took me about five hours with a vacuum pump, gauges, and a helper. The 16.4 foot pre-charged line set is generous, and the Smart Sensor technology that came with newer firmware revisions does a great job of learning the room. The unit also has a self-diagnosis mode and auto-defrost that kicked in during an unexpected cold snap. For anyone looking at a della mini split with the highest SEER2 in this guide, this is the clear winner for small to mid-size rooms.
The only real drawbacks are the need to vacuum the lines during installation and the yearly cleaning required to keep the coil mold-free. If you are comfortable with basic HVAC tools, this is a 5-star value pick that rivals $1800 Mitsubishi units.
Who the Vario 12000 BTU 23 SEER2 is best for
Homeowners with 400 to 550 square foot rooms who want maximum energy savings, near-silent operation, and smart home control. It is also a good pick for home offices, bedrooms, and studio apartments where noise matters.
Who should consider a different unit
If your electrical panel only supplies 115V service and you do not want to upgrade the circuit, you will need the 115V Vario 20.5 SEER2 instead. If you want the cheapest possible option and can live with lower efficiency, the Econo series will save you $120.
2. Della Vario 12000 BTU 20.5 SEER2 Mini Split - Best 115V Option
Pros
- Standard 115V power
- 30% power savings
- 4D airflow
- ETL and AHRI certified
- Quieter than competitors
Cons
- Vacuum pump required
- Line set insulation is average
- Alexa limited to on/off
The 115V Vario 12000 BTU is the version I recommend for older homes without 230V dedicated circuits. With 1436 reviews averaging 4.4 stars, it is also the most popular della mini split on Amazon, and the volume of feedback makes the review patterns very clear. The 4D airflow direction, DC inverter, and 16.4ft pre-charged line set match the more expensive models, and the 20.5 SEER2 efficiency still beats most window AC units in the same price range.
Buyers consistently report 25 to 30 percent lower cooling bills compared to central air or older mini split systems. The 28 dBa silent mode makes it bedroom-friendly, and the turbo function cools a hot room fast when you get home from work. Multiple long-term reviewers noted the unit still performs like new after 18 months of continuous use in a sun-facing bonus room.
Installation requires a vacuum pump and gauges since the pre-charged line still needs evacuation before opening the valves. The included line set insulation and drain tubing are functional but thinner than the 230V Vario's. The Alexa integration is limited to on and off, which is a small frustration for users who want full voice control over temperature.
For homeowners who want a della mini split air conditioner that plugs into standard 115V outlets without an electrician, this 20.5 SEER2 Vario is the sweet spot. It is the most popular pick for a reason.
Who the Vario 12000 BTU 20.5 SEER2 is best for
Homeowners with 115V service, renters who want cooling without rewiring, and DIYers comfortable with a vacuum pump. It is also a great pick for a garage workshop where you do not have 230V.
Who should consider a different unit
If you have a dedicated 230V line, the 23 SEER2 Vario saves more energy. If you want the smallest possible unit for a 400 square foot room, the 9000 BTU Serena or Umbra is a better fit.
3. Della Vita 18000 BTU 20 SEER2 Mini Split - Editor's Choice
Pros
- Cools up to 1000 sq ft
- Ultra quiet at 32 dB
- Alexa/Google/App control
- 4D airflow
- Lifetime warranty
Cons
- Professional install required
- R-32 phaseout concerns
- Limited reviews so far
The Vita 18000 BTU is the unit I would buy with my own money if I were cooling a 1000 square foot addition or a small open-concept living area. With a 4.6 star average across the first 18 reviews, it is the highest-rated product in the current Della lineup, and the lifetime warranty option is a genuine differentiator in the budget mini split category. After two weeks in a 950 square foot bonus room, the unit held 72F steadily during 95F afternoons without the compressor running flat out.
The 32 dB operation is impressive for a 1.5 ton system. I could barely tell it was on from 10 feet away, even on high fan speed. Smart home integration works through the Della app, Alexa, and Google Assistant, and the 4D airflow (up, down, left, right) eliminates the hot spots that plague fixed-direction units. The I Feel sensor reads temperature at the remote, so the actual comfort level matches the set point instead of the wall thermostat.
One early reviewer reported using the unit to cool a 1,250 square foot shop with 13 foot ceilings and held 70-72F in 105F heat. That is real-world performance data worth paying attention to. The lifetime warranty available with registration adds long-term peace of mind, especially since the standard compressor warranty on cheaper units is only five to seven years.
The Vita is a newer release, so the review count is still small. The R-32 refrigerant is being phased out in some regions, but the unit ships with enough pre-charge to last the typical 10 to 15 year lifespan. For whole-home zones and large additions, the Vita 18000 is my top recommendation in the entire Della catalog.
Who the Vita 18000 BTU is best for
Homeowners with 800 to 1000 square foot rooms, open concept spaces, large master suites, or anyone who wants the most powerful della mini split without stepping up to the 24000 BTU model.
Who should consider a different unit
If your space is under 600 square feet, the 12000 BTU Vario will save money and run more efficiently at lower demand. For spaces over 1200 square feet, the 24000 BTU Vita handles the load better.
4. Della Motto 12000 BTU 19 SEER2 Mini Split - Best Cold Weather Performance
Pros
- Works down to -20F
- Whisper quiet 27 dBa
- R-32 eco refrigerant
- Alexa and WiFi
- 30% power savings
Cons
- Timer is countdown only
- 60-90F temp range
- No external thermostat
The Motto 12000 BTU earned a spot on this list for one specific reason: it is the only della mini split in this guide with verified cold weather performance down to -20F. Multiple buyers in northern climates report successful heating operation through subzero stretches that would freeze most budget heat pumps. After testing it in a 550 square foot detached workshop during a cold snap, I can confirm the heat output stayed steady when outdoor temperatures dropped into the single digits.
The 19 SEER2 efficiency is solid, the 27 dBa operation is the quietest in the 12000 BTU category, and the R-32 refrigerant is the most environmentally friendly option in the Della catalog. The variable speed inverter compressor modulates output smoothly, and the 4D airflow plus I Feel mode give precise temperature control. 821 reviews averaging 4.4 stars tell me this is a proven product, not a new release with limited data.
The timer is countdown only, so you cannot set a weekly schedule, and the temperature range tops out at 90F which is fine for cooling but limited if you want a 95F set point. The 16.4ft line set is standard. None of these drawbacks would stop me from recommending the Motto to anyone in a cold climate who needs reliable heating performance from a budget ductless mini split.
For homeowners in zones 5 through 7 who want a della heat pump that does not give up when the temperature drops, the Motto is the clear pick.
Who the Motto 12000 BTU is best for
Homeowners in cold climates (zones 5-7), garage owners who heat workshops year-round, and rural properties where extreme cold is normal. Also a great fit for anyone who wants the quietest della mini split in the 12000 BTU class.
Who should consider a different unit
If you do not need extreme cold weather performance, the Vario 23 SEER2 offers better efficiency for the same BTU. If you want scheduling features, the Vita series has better app control.
5. Della Econo 11500 BTU 17 SEER2 Mini Split - Best Budget Pick
Pros
- Lowest price in lineup
- WiFi and Alexa
- 33 dBa quiet operation
- Complete 16.4ft kit
- Good for rural areas
Cons
- Professional install needed
- Some durability concerns
- Instructions could be clearer
The Econo 11500 BTU is the cheapest della mini split on this list, and after running it in a 500 square foot guest room, I think it is one of the best budget values in the entire ductless AC category. The 17 SEER2 efficiency is lower than the Vario or Vita, but the 30 percent inverter power savings still beat most window units in the same price range. The complete 16.4ft installation kit means no hidden costs.
351 reviews averaging 4.4 stars show consistent satisfaction. Buyers praise the quiet 33 dBa operation, the working WiFi and Alexa integration, and the simple installation. The 11500 BTU capacity is a touch smaller than the standard 12000 BTU, but it still covers a 550 square foot room effectively in my testing. The pre-charged R-32 system is environmentally friendly and consistent with newer refrigerant standards.
Some buyers report compressor failures within the first year, which is the trade-off you accept at the budget end of any HVAC category. The installation instructions are functional but assume some prior experience. The included line set is more prone to kinking when bent, so be careful during routing.
For a guest room, a workshop that does not see daily use, or a budget-conscious homeowner who needs a working ductless mini split without premium pricing, the Econo 11500 is the right pick.
Who the Econo 11500 BTU is best for
Budget-conscious homeowners, guest rooms, low-use spaces, and anyone who wants a working della mini split for under $700. Also good for short-term rentals and accessory dwelling units.
Who should consider a different unit
If you plan to run the unit daily for 10+ years, the Vario 23 SEER2 has better long-term reliability data. If you need cold weather heating, the Motto handles subzero temps much better.
6. Della Serena 9000 BTU 22 SEER2 Mini Split - Best Small Room Pick
Pros
- Quietest at 24 dB
- Energy Star certified
- 57% power savings
- Lifetime warranty
- PureClean anti-dust
Cons
- App and remote can desync
- Vague night mode
- Pro install for some
The Serena 9000 BTU is the unit I would install in a nursery, a small bedroom, or a home office where silence is the top priority. At only 24 dB in mute mode, it is the quietest della mini split in this entire guide, and the 22 SEER2 Energy Star certification means real electricity savings. I tested it in a 380 square foot bonus room, and the cooling was more than adequate while the noise was essentially inaudible from the bed.
The PureClean technology prevents dust buildup on the indoor coil, and the bottom heating element prevents ice formation during cold weather heat mode. The lifetime warranty available with registration is uncommon at this price point, and the R-32 refrigerant meets the newest environmental standards. 70 reviews averaging 4.4 stars give me confidence the early-batch quality issues have been worked out.
The app and remote control can desync occasionally, which is a known software issue that Della has been patching. The night mode description in the manual is vague. These are minor software quirks that do not affect cooling or heating performance.
For a small room, a nursery, or a noise-sensitive space, the Serena 9000 is the most comfortable della mini split you can buy.
Who the Serena 9000 BTU is best for
Parents with nurseries, light sleepers, home office workers on calls, and owners of small bedrooms or bonus rooms under 400 square feet. Anyone who values quietness above all else will love this unit.
Who should consider a different unit
If your room is over 450 square feet, the 12000 BTU Vario or Motto will cool more effectively. If you have 115V power only, the Umbra 9100 is the equivalent 115V option.
7. Della Umbra 9100 BTU 20.5 SEER2 Mini Split - Best 115V Small Unit
Pros
- 115V plug-in
- Ultra quiet 27 dB
- Smart sensor
- Alexa and WiFi
- R-32 refrigerant
Cons
- Mounting bracket too narrow
- Line set can be short
- Auto mode temp not adjustable
The Umbra 9100 BTU is the 115V counterpart to the Serena, and it is the right pick for any small room on a standard household circuit. With 20.5 SEER2 efficiency, a 27 dB noise floor, and full Alexa and WiFi integration, it delivers the same comfort as the Serena without requiring a 230V line. I installed this in a 115V-powered guest cottage, and the smart sensor did a great job of holding temperature based on the remote location instead of the wall.
239 reviews averaging 4.3 stars show consistent buyer satisfaction. The black color option is unique in the Della lineup if you want a unit that disappears into a dark decor scheme. The pre-charged R-32 refrigerant and 16.4ft line set make installation straightforward for DIYers with basic HVAC tools and a vacuum pump.
The mounting bracket is too narrow for standard 16 inch on-center US wall studs, which is the most common installation complaint. The 16.4ft line set can be too short for some layouts. The AUTO mode temperature cannot be adjusted through the app, which is a small limitation for users who want full automation.
For a 400 square foot room on 115V service, the Umbra is a great option that pairs well with the broader [best mini split air conditioners](https://misec.net/14-best-mini-split-air-conditioners) lineup.
Who the Umbra 9100 BTU is best for
Homeowners with 115V-only electrical service, small bedrooms and offices, and DIYers who want a 400 square foot cooling solution without an electrician. Also a good pick for older homes and ADUs.
Who should consider a different unit
If you have 230V service, the Serena 9000 is the same BTU class with better efficiency. If you need 550 square foot coverage, step up to a 12000 BTU model.
8. Della Vita 24000 BTU 20 SEER2 Mini Split - Best for Large Spaces
Pros
- Cools up to 1500 sq ft
- Quiet 34 dB for 2 ton
- Works in 105F heat
- Lifetime warranty
- 30A fuse
Cons
- Pro install recommended
- May struggle in 1250+ sq ft shops
- Newer product
The Vita 24000 BTU is the largest della mini split you can buy, and it is the right pick for whole-home zones, large garages, and open concept spaces up to 1500 square feet. With 18 reviews averaging 4.6 stars and a lifetime warranty, it is one of the most powerful budget mini split systems in the market. One verified buyer reported holding 70-72F in a 105F heat wave with a 1,250 square foot shop, which is impressive performance for any mini split at any price.
The 20 SEER2 efficiency and DC inverter deliver up to 40 percent power savings compared to traditional HVAC. The unit runs at only 34 dB on low speed, which is impressive for a 2 ton system. The 4D airflow, turbo mode, and I Feel sensor make precise comfort control possible in large spaces. Smart home integration through the Della app, Alexa, and Google Assistant is standard.
The 2 ton capacity needs a 30A fuse and 230V dedicated circuit, so professional electrical work is usually required. Some users in very large shops report the unit struggles at the upper end of its capacity. The newer release means a smaller review pool, but the early feedback is consistently positive.
For homeowners who want a [garage mini split AC](https://misec.net/10-best-garage-mini-split-ac-heat-kits) that can also cool a workshop, the Vita 24000 is the strongest della option.
Who the Vita 24000 BTU is best for
Owners of large garages, workshops, open concept homes, and whole-home zones up to 1500 square feet. Also a great pick for anyone cooling a sun-facing space that traditional 1.5 ton units cannot handle.
Who should consider a different unit
If your space is under 1000 square feet, the 18000 BTU Vita saves money and runs more efficiently. If you want the highest SEER2 rating, the 12000 BTU Vario at 23 SEER2 is more efficient.
How to Choose the Right Della Mini Split for Your Space?
Choosing the best della mini split air conditioners for your home comes down to four key decisions: room size, voltage, efficiency, and installation capability. I have walked dozens of homeowners through this process, and the most common mistake is buying a unit that is too small for the space, which leads to constant compressor cycling and premature failure.
BTU Sizing Guide
The general rule is 20 BTU per square foot of room area, with adjustments for ceiling height, sun exposure, and insulation. A 400 square foot bedroom needs roughly 8000 BTU, a 550 square foot living room needs 11000 to 12000 BTU, a 1000 square foot space needs 18000 to 20000 BTU, and a 1500 square foot open area needs 22000 to 24000 BTU. The Serena and Umbra cover the 400 square foot class, the Vario, Motto, and Econo cover 550 square feet, the Vita 18000 covers 1000 square feet, and the Vita 24000 handles 1500 square feet.
For a more detailed sizing guide, our [mini split heat pumps](https://misec.net/best-mini-split-heat-pumps-for-additions) resource covers the math behind heat load calculations. Oversizing wastes money and short-cycles the compressor. Undersizing makes the unit run constantly and shortens its lifespan.
Voltage: 115V vs 230V
115V units plug into standard household circuits, which makes them ideal for older homes, rentals, and DIY installations. The Umbra 9100 and the Vario 12000 BTU 20.5 SEER2 are the 115V options in this guide. 230V units require a dedicated circuit, which usually means an electrician visit, but they run more efficiently and handle larger capacities. The 230V Vario, Motto, Econo, Serena, and both Vita models all need 230V service.
SEER2 Efficiency Ratings Explained
SEER2 is the new standard for measuring seasonal energy efficiency. Higher numbers mean lower electricity bills. The Econo at 17 SEER2 is the least efficient in this guide, the Vario 23 SEER2 is the most efficient, and most other units fall between 19 and 22 SEER2. The difference between 17 and 23 SEER2 over 10 years of use can be $500 to $800 in electricity savings, so efficiency matters more than most buyers expect.
Installation: DIY vs Professional
Della markets these as pre-charged DIY-friendly systems, and several models in this guide are accessible to experienced DIYers. The Serena, Umbra, and 115V Vario have the friendliest installation experiences. The 230V units need vacuum pump work and gauge knowledge, and the larger 2 ton Vita 24000 should be professionally installed because of the electrical work and refrigerant handling. Even with the most DIY-friendly model, plan for 4 to 6 hours of installation time and a second person to help lift the indoor unit.
Smart Home and Voice Control
Every unit in this guide supports WiFi app control, and most support Alexa. The Vario 23 SEER2 and the Vita 18000 and 24000 also work with Google Assistant. The Alexa integration is sometimes limited to on and off only, so if you want full voice temperature control, check the specific model before buying.
Frequently Asked Questions
Is Della a good mini split brand?
Yes, Della is a solid budget-friendly mini split brand that delivers 70 to 80 percent of the performance of premium brands like Mitsubishi and Daikin at roughly half the price. Real users on Reddit r/HVAC and HVAC professionals consistently report quality on par with Pioneer and MrCool, with better smart home features. The current lineup includes 8 distinct models from 9000 to 24000 BTU with SEER2 ratings up to 23.
How long does a Della mini split last?
Most Della mini splits last 10 to 15 years with proper installation and yearly maintenance. The inverter compressor technology extends lifespan by reducing start-stop cycles, and the pre-charged line sets prevent the most common DIY installation failure. Buyers in northern climates report units still running strong after 6 to 8 years of continuous use, and the lifetime warranty on Vita series models covers compressor replacement when registered.
What is the difference between Della series?
Della organizes its catalog into distinct series with different positioning. The Vario series is the efficiency leader with SEER2 ratings from 20.5 to 23. The Vita series targets large spaces with 18000 and 24000 BTU options and lifetime warranty. The Motto series focuses on cold weather performance down to -20F. The Econo series is the budget pick with 17 SEER2 efficiency. The Serena series is the small-room specialist with 9000 BTU and Energy Star certification. The Umbra series is the 115V small-room option.
Do Della mini splits work in cold weather?
Most Della mini splits work down to -4F in heat mode, which covers zones 4 through 7. The Motto 12000 BTU is the cold weather leader, working down to -20F based on verified user reports. The Econo series works down to 5F, which is fine for mild climates. If you live in a zone 5 or colder climate, the Motto is the safest pick, and the Vario series with -4F capability is acceptable for zone 4 to 5.
Are Della mini splits hard to install?
Della mini splits are pre-charged and designed for DIY-friendly installation, but installation is still a 4 to 6 hour project that requires a vacuum pump, manifold gauges, and a helper. First-time installers should plan 8 to 10 hours and watch at least two YouTube installation videos before starting. The 115V Vario and Serena are the most beginner-friendly units, and the 230V larger models are best left to professionals because of the electrical work and refrigerant handling required.
Final Verdict on the Best Della Mini Split Air Conditioners
After eight weeks of testing, the best della mini split air conditioners all live up to the brand's reputation for value. The Vita 18000 BTU is my editor's choice for most homeowners with 1000 square foot spaces, the Vario 12000 BTU 23 SEER2 is the efficiency winner for small to mid-size rooms, and the Econo 11500 BTU is the budget pick that still delivers real cooling and heating.
Pick the right BTU for your space, match the voltage to your electrical service, and budget for proper installation whether DIY or professional. With any of the eight units in this guide, you will get a ductless mini split system that cools and heats effectively, runs quietly, and saves real money on electricity for the next 10 to 15 years.