Struggling to keep two rooms comfortable without juggling noisy window units or relying on ductwork you don’t have? that’s exactly the problem dual‑zone mini splits are built to solve—and it’s where the DELLA 20K BTU ODU 2 Dual Zone 9,000 + 9,000 BTU WiFi Mini Split aims to stand out.
This is a multi‑zone, ductless heat pump system with two indoor air handlers and one outdoor condenser, rated at 20 SEER2 and designed (per the manufacturer) to cool and heat up to 800 sq. ft. It’s also WiFi-enabled through the Della+ app (2.4 GHz band) and supports voice control with Alexa, plus features like Sleep Mode, schedules/timers, multiple modes, and defrost protection.
in this review, we’ll break down what the specs mean in real life, what installation realistically involves (including the included 16 ft installation kits), and how the smart features fit into day-to-day use. We’ve researched and compared mini-split systems across room sizes and climates, and we’ll also reflect common customer themes—like quiet operation and responsive support, alongside reports of shipping dings and occasional error-code headaches.
Commercial Performance Overview for Multi Room Business Zoning and Peak Load Cooling
For multi-room business zoning, this DELLA dual-zone setup is built around two 9,000 BTU indoor handlers paired to a single outdoor unit, which (according to DELLA) allows separate temperature control in each room.In practical terms, that zoning approach is a good fit for small commercial layouts where two areas have different usage patterns—like an office plus a back room, a salon floor plus a break room, or a retail area plus a stockroom—without having to run ductwork. The manufacturer rates the system at 20,000 BTU/h cooling with coverage up to 800 sq. ft. total (with ~400 sq. ft. recommended per head), and includes WiFi control via the DELLA+ app plus voice control support (Alexa noted in the listing). That combination can be helpful in light-commercial settings where scheduling/timers and fast setpoint adjustments matter day-to-day.
For peak-load cooling (hot afternoons, sun-facing rooms, busy periods), the system layers in features intended to handle demand swings: per the product description it uses DC inverter technology (designed to modulate output instead of running strictly on/off), a turbo function, multiple fan speeds, and 4D airflow for distribution. DELLA also claims quiet operation at 29 dBa, which can be notable in client-facing areas where noise becomes part of the comfort equation. Customer feedback is mixed but informative: several reviewers report that the two heads run daily in very hot conditions and “work great” with “dead silent” operation, while at least one review mentions error codes and difficulty finding local technicians willing to service the brand—an important consideration for business uptime. Keep in mind the listing states the system mandates professional installation and that line-set vacuuming is required; cutting corners there can show up later as comfort issues during peak load.
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Energy Cost Savings Real Numbers on Efficiency Utility Spend and ROI Planning
The big efficiency story with this DELLA dual-zone system is that it’s rated 20 SEER2 and uses DC inverter technology. In general HVAC terms, a higher SEER2 rating means the unit delivers more cooling for the electricity it uses, and inverter-driven compressors are designed to avoid the waste of constant on/off cycling by ramping output up and down based on demand.DELLA also markets an eco energy saving mode, and the multi-zone setup (two 9,000 BTU indoor heads on one outdoor condenser, rated to cool/heat up to 800 sq. ft. total) can help with “right-sizing” comfort—conditioning the rooms you’re actually using instead of forcing one temperature across the whole home.
for “real numbers” planning, what you can confidently anchor to is the equipment’s published efficiency (20 SEER2)—not a guaranteed bill reduction. Actual utility spend comes down to yoru electric rate, climate, run time, thermostat setpoints, and whether the system is sized appropriately for the spaces (DELLA suggests about 400 sq. ft. per 9k head). Customer feedback is mixed but includes at least one reviewer saying “This item saved us money!”—useful as a data point, but not a global outcome. If you’re trying to map ROI, the most honest approach is to compare (1) your current kWh usage for window/portable units or older HVAC, (2) your local $/kWh rate, and (3) expected hours of operation—then treat the mini-split’s high SEER2 and inverter operation as efficiency advantages that can improve the math, rather than a fixed dollar savings promise. Check current Price & Customer Reviews on Amazon →
Installation Without Business disruption for Active Workspaces Scheduling and Minimal Downtime
In an active workspace,the big advantage of a dual-zone ductless setup like the DELLA 20,000 BTU (9,000 + 9,000) multi-zone mini split is that it can be added without tearing into ceilings for ductwork—so you can often keep areas operational while the system is mounted and piped.According to DELLA, this model includes two 16ft line sets (two installation kits) plus a 78.7″ drain pipe, which helps installers work with standard layouts without repeatedly stopping to source extra parts. For scheduling work around business hours, the system’s built-in controls like the 24-hour timer and WiFi support (2.4 GHz) can also help you pre-cool or pre-heat rooms before people arrive, reducing comfort complaints during the transition period.
Having mentioned that, “minimal downtime” depends heavily on how you plan the install. DELLA states that line-set vacuuming is required and that this system mandates professional installation, so there will be at least some staged downtime while the outdoor unit is set, wall penetrations are drilled, and the system is evacuated and commissioned. In customer reviews, some installations where described as “easy” or completed in a day, while another reviewer noted an E4 low-pressure error due to a loose fitting—an example of why commissioning and leak checks matter if you’re trying to avoid repeat visits and disruption. If you’re installing in an occupied office, studio, or retail space, it’s realistic to schedule the noisiest steps (mounting, drilling, pulling lines, electrical work) after hours, then leave final startup/testing for a low-traffic window—especially since changing line-set length can require adjusting refrigerant levels (per the manufacturer guidance).Check Current Price & Customer Reviews on Amazon →
Comfort and Control for Staff and Customers with Smart Scheduling plus Maintenance Warranty and Commercial Alternatives Comparison
DELLA leans hard into “set it and forget it” comfort features that can make day-to-day life easier for both staff and customers—especially in small commercial spaces where rooms have different needs. According to the product description, this dual-zone system includes WiFi control via the Della+ app plus Schedules & Timer, and it can also work with voice controls (Alexa)—with the important caveat that WiFi supports the 2.4 GHz band only. For operational control, it also lists practical comfort tools like 4D airflow, I Feel mode (uses the remote to sense temperature), sleep mode, and a 24-hour timer, along with heating/cooling/dry modes. In real-world feedback, reviewers commonly describe the system as quiet (“dead silent”) and effective at cooling, which matters when you’re trying to keep a waiting area, office, or shop comfortable without noise disrupting conversations.
On the maintenance and ownership side, DELLA’s warranty structure is a key part of the value proposition, but it’s also an area where you’ll want to read the fine print and plan your install accordingly. The product description states their “Lifetime Coverage Mini Split” requires registration within 100 days for lifetime parts coverage, and that HVAC-licensed installs receive enhanced lifetime coverage while non-licensed installs receive limited lifetime parts coverage. That pairs well with standard mini-split upkeep (seasonal filter cleaning, keeping the outdoor unit clear, and periodic inspection), also outlined in the description. For commercial alternatives, the most straightforward comparison is staying within DELLA’s own multi-zone lineup: this configuration is a 2-zone 20,000 BTU/h system rated up to 800 sq ft (9,000 + 9,000 heads), while the same series offers larger coverage targets like 950 or 1100 sq ft with different 2-zone combinations—so upgrading can be as simple as choosing a higher-capacity pairing if your space has heavier foot traffic, more heat-generating equipment, or more glass exposure. (I can’t responsibly rank it against specific “commercial grade” competitors without verified spec-to-spec data, but sizing up within the listed DELLA options is a factual, low-risk way to compare alternatives.)
Check Current Price & customer Reviews on amazon →
Customer Reviews Analysis
Customer Experience Summary (Based on Provided reviews)
1. Overall Sentiment
Overall tone was mixed but often positive. Multiple reviewers described strong cooling performance, quiet operation, and good value, while a few reported error codes, heating failures, shipping damage, delivery delays, and sharply different experiences with customer support.
2. Common Praise (Grouped by Theme)
Performance (Cooling/Heating)
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- Many customers mentioned strong cooling performance, with comments like:
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- “still going strong in the florida heat”
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- “Air conditioner works fast”
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- “they cool a very good area”
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- “Both units cooling pretty good”
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- One reviewer with professional installation said the system “worked great for a few months” after install (before an error occurred).
noise Level
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- Multiple reviews praised how quiet it runs, using phrases such as:
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- “Dead silent operation too both inside and out”
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- “super quite”
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- “lovely, quiet” (even though that reviewer said it wasn’t functional for heating)
Value / Cost vs Alternatives
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- A common theme in reviews was that the unit felt like a strong value compared to quotes from HVAC professionals, including:
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- “saved us money”
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- “We were quoted… triple this amount”
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- “viable and affordable option” compared to “Central Air is very expensive”
Installation (DIY friendliness / included kit)
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- Several reviewers noted easy or manageable installation, including:
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- “Easy installation… installed in a day with no issues”
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- “pretty easy diy installation”
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- Another reviewer said the mounting process “went right on no problems”
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- One reviewer specifically recommended help due to size/handling: “I recommend two people to install”
Looks / Wall Space
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- Some customers appreciated the design and footprint:
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- “doesn’t take up much room on the wall”
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- “sleek white look”
Customer Service (Positive experiences)
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- Some customers had a notably good experience with support:
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- “The best thing about these are the people at Della… responsive and dedicated… respond quickly and offer suggestions for troubleshooting”
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- Another reviewer said “customer service responded pretty quickly via email”
3. Common Concerns (Grouped by Theme)
Errors / Not Working as was to be expected (Heating, codes, pressure)
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- Some customers experienced operational problems and error codes:
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- One reviewer reported “3 error codes and the units will not heat”
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- Another encountered an “E4 error… indicated low pressure,” later traced to “a loose fitting” the installer missed
Customer Service (Negative experiences)
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- A few customers reported serious dissatisfaction with support responsiveness:
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- “hung up on”
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- “zero support or help if anything goes wrong”
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- Promised follow-ups that didn’t arrive: “someone would email… that was 3 days ago” / “a technician would call me back, nothing”
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- one reviewer also stated they couldn’t find local help: “couldn’t find a single HVAC technician in CT who was willing to work on it… after they found out the brand”
Shipping / Delivery
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- some customers reported long or cumbersome delivery:
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- “Took about 2 weeks to arrive in a tractor trailer”
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- “delivery took little longer than I expected (it comes on rails)”
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- Shipping condition issues came up as well:
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- “condensing unit has a dent on the side” (described as cosmetic), resolved with a negotiated “$180.00 refund”
Included Components / Materials
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- A few customers criticized specific kit materials or noted limitations:
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- The wall pass-through tube was described as “cheesy and flimsy”
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- One reviewer warned the included line length may not fit every home: “16 ft lines… if need longer… have to be extra purchased”
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- One reviewer noted “The copper tube is extremely thin walled and easy to bend” (presented as an observation during install)
4. Notable Use Cases (What reviewers specifically described)
- Florida heat, long-term use: “2 years in and still going strong in the florida heat.”
- Texas older home renovation / replacing window units: A reviewer in a “home… built in 1949 in Texas” said they used window units previously and found these mini splits a “viable and affordable option.”
- Barndominium setup: One reviewer installed a “dual unit” in a barndominium and used a local HVAC company.
- DIY / Pro-style installation approach: One reviewer detailed vacuuming to “500 microns,” electrical run to a “double pole 30a breaker,” and adding third-party line set covers to make it “look pro.”
- Areas with limited service support: One reviewer in connecticut said they had trouble finding technicians willing to work on the brand and struggled to get help when heating failed.
Pros & Cons
Strengths
- Dual-zone temperature control (9,000 + 9,000 BTU heads): Manufacturer states it includes two indoor air handlers with separate controllers so each room can be set independently.
- High stated efficiency (20 SEER2) with inverter system: Product description lists 20 SEER2 and an “inverter plus system” with DC inverter technology (also notes “up to 30% power savings” as a manufacturer claim).
- Solid coverage for a small multi-room setup (up to 800 sq ft): Listed to cool/heat up to 800 sq. ft.total, with each indoor unit recommended for ~400 sq. ft.
- WiFi/app + voice control support: Description highlights the “Free Della+ app” (schedules/timer,geo location) and “voice Controls,” and the listing title indicates Alexa compatibility; it also specifies WiFi works on 2.4 GHz only.
- Quiet operation (29 dBa) frequently enough echoed by reviewers: specs claim “ultra silent at only 29 dBa,” and multiple reviewers describe it as “dead silent,” “super quiet,” or quiet inside/out.
- Included installation accessories and pre-charged system: Comes with two 16 ft copper line sets and two installation kits; described as “AHRI Certified pre-charged,” which reviewers note helped them complete installation with standard HVAC steps (vacuuming, flares, etc.).
Considerations
- Not a DIY-friendly install per manufacturer (professional install required): product description explicitly states “This system mandates professional installation – itS not a DIY mini split AC,” and also notes line-set vacuuming is required.
- line length limits can add cost/complexity: Included line sets are 16 ft; the manufacturer notes longer line-set extensions are available,but if any individual line set exceeds 25 ft,additional refrigerant is required (suggesting added parts/labor).
- No self-cleaning function (even if the button appears): Manufacturer disclaimer says this model does not support self-cleaning; the option may still display but the self-cleaning operation “will not be performed.”
- Some customers report service/support problems and technician availability issues: At least one review describes repeated calls with no follow-up and difficulty finding local HVAC technicians willing to work on the brand.
- Shipping/packaging issues reported (cosmetic damage, long delivery): Reviews mention delivery taking ~2 weeks and an outdoor unit arriving with a dent (noted as cosmetic), plus another reviewer citing longer-than-expected delivery.
Q&A
What size area can this dual-zone mini split cool and heat?
This DELLA multi-zone system is listed as 20,000 BTU/h total (two 9,000 BTU indoor air handlers) and “recommended room size (up to) 800 sq. ft,” with each indoor unit recommended for about 400 sq. ft. Actual performance depends on insulation, ceiling height, sun exposure, and local climate. The manufacturer also provides sizing examples: a 400 sq. ft room typically needs 9,000 BTU, and a 550 sq.ft room needs 12,000 BTU.
Does it heat and also cool (is it a heat pump), and how cold can it operate?
yes. This is a ductless inverter mini split with a heat pump, so it provides both heating and cooling. The product information states the heat pump can operate down to -13°F (-25°C). (One section of the listing also mentions operation “as low as 5°F,” so for the official operating minimum for your exact configuration, confirm in the manufacturer documentation or the Amazon listing details.)
Does it work with Wi‑Fi and Alexa, and what Wi‑Fi band does it require?
Yes—this model is described as Wi‑Fi enabled and “work with alexa,” and it references the DELLA+ app features (schedules/timer, multiple modes, geolocation, and voice controls).Wi‑Fi support is 2.4 GHz only (it does not support 5 GHz networks).
Is this system DIY-friendly, and what are the installation requirements?
The listing states “Line-set vacuuming is required during installation” and that the system “mandates professional installation” (i.e., it’s not positioned as a DIY mini split).In general HVAC practice, proper evacuation (vacuum) and leak-free flare connections are critical for performance and reliability.If you change the line-set length, the product information also notes refrigerant (freon) levels may need adjustment—this is typically a job for a qualified HVAC professional.
What comes in the box for installation—are line sets included, and how long are they?
It includes two 16 ft copper line sets (two kits) listed as standard size 1/4″ and 3/8″ outside diameter, plus installation kits.The listing also states the drain pipe length is 78.7 inches. If your run requires longer piping, DELLA states it offers other line set lengths for multi-zone systems.
Can I extend the line sets beyond 16 ft, and do I need to add refrigerant?
DELLA indicates longer line set options are available. They also note that if any individual line set is longer than 25 feet, additional refrigerant will be required—consult a professional HVAC technician to size/install correctly and charge the system as needed.
How loud is it, and what temperature range can I set?
The listing describes “ultra silent” operation at 29 dBa (per the product description). It also states the system can adjust to setpoints from 60°F to 90°F. Noise and comfort can vary by indoor fan speed, mounting quality, and room acoustics. For official specs, verify on the Amazon product page for this exact model/combination.
Seize the Opportunity
The DELLA 20K BTU ODU 2 dual-zone mini split pairs two 9,000 BTU indoor heads with one outdoor condenser, offers a 20 SEER2 rating, WiFi control (2.4 GHz only) with Alexa support, and is rated to cool up to 800 sq. ft. In reviews, owners commonly highlight fast cooling, very quiet operation (listed as low as 29 dB), and good overall comfort for multi-room setups—though installation quality clearly matters.
Best for: cooling (and heat pump support) in two separate rooms around ~400 sq. ft. each—like bedrooms, a home office plus living area, additions, or barndominiums—when you want independent temperature control per zone.
Consider alternatives if: you need a true DIY system (vacuuming is required and the listing says professional installation),need longer than the included 16 ft line sets (extensions may require added refrigerant),or want broader local service availability.
it’s a feature-rich dual-zone option on paper,but plan the install carefully and verify support and compatibility for your area.
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