DELLA Serena 12000 BTU Mini Split AC & Heat Pump - Smart 22 SEER2

Our review of the DELLA Serena 12000 BTU mini split finds it best suited to homeowners and small businesses who want quiet, energy-efficient climate control with modern smart features. The single biggest reason to consider this unit is its combination of a high 22 SEER2 efficiency rating and built-in WiFi voice control, which together reduce running costs while letting users control temperature remotely. Installation requires a professional, but the pre-charged line set and included 16.4ft install kit simplify the process for installers and speed up setup for rooms up to 550 sq. ft.

Key Features

• Smart controls: WiFi compatibility with Alexa and Google Home plus the DELLA app and geo-location deliver remote temperature control and automated energy savings.
• High efficiency: A 22 SEER2 rating and inverter technology provide up to significant power savings by avoiding frequent compressor on/off cycles.
• Heating to cold temps: The pre-charged 1 ton heat pump offers heating performance down to about 5F/-15C with a bottom heating element on the outdoor unit to prevent icing.
• Quiet operation: Indoor unit noise drops to about 23 dBa in mute mode, making it suitable for bedrooms and offices where low sound is important.
• Flexible airflow and modes: 4D air flow, multiple fan speeds, turbo, dry, eco and sleep modes adapt output for comfort and dehumidifying needs.
• Maintenance simplicity: Reusable filters and PureClean tech reduce dust buildup and simplify seasonal upkeep for healthier indoor air.

Who It's For

The DELLA Serena is ideal for owners of rooms up to roughly 550 sq. ft. who want a modern, connected mini split with strong cooling and reliable heating in cold conditions. It suits bedrooms, living areas, small commercial spaces, garages used for detailing, and home offices where quiet, efficient operation with remote control matters.

This is not a DIY project: the system mandates professional installation, line-set vacuuming, and attention to refrigerant adjustments if the line-set length is altered. Buyers on a tight budget or those who need a very small window unit should look elsewhere.

Pros & Cons

Pros

• High 22 SEER2 efficiency with inverter technology reduces energy use compared with conventional compressors.
• Robust smart features including WiFi, voice control and geo-location for remote convenience and energy savings.
• Very quiet indoor operation and multi-mode airflow for comfort in bedrooms and offices.
• Pre-charged system and included 16.4 ft install kit streamline professional installation.

Cons

• Requires professional installation and line-set vacuuming, so it is not suitable for DIY installers.
• Maximum fuse size and proper refrigerant charging must be observed, adding installation detail for technicians.

Specifications

Cooling Capacity	12000 BTU/h (1 ton)
Efficiency	22 SEER2
Power	115V, inverter technology
Coverage	Up to 550 sq. ft.
Noise Level	As low as 23 dBa (mute mode)
Install Kit	16.4 ft pre-charged line set (R32) and 78.7 in drain
Certifications	Energy Star, UL/ETL listed, AHRI certified

Our Verdict

The DELLA Serena 12000 BTU mini split is a strong choice for anyone who needs a quiet, efficient heating and cooling solution for spaces up to about 550 sq. ft. Its smart controls, high SEER2 efficiency and quiet operation offer good long-term value when installed professionally, and the pre-charged kit helps reduce installation time for technicians.

Frequently Asked Questions

Does this unit include refrigerant?
Yes, the indoor/outdoor system is pre-loaded with R32 refrigerant for up to 25 ft of line-set, but any alteration requires refrigerant adjustment by the installer.

Can I install this myself?
No, this system mandates professional installation, including line-set vacuuming and proper electrical protection with a maximum fuse size of 25A.

Will it work in cold climates?
Yes, the outdoor unit has a bottom heating element for defrosting and the heat pump operates down to about 5F/-15C for reliable winter performance.