DELLA Vario Series 12000 BTU Mini Split Air Conditioner Work with Alexa with 1 Ton Pre-Charged Heat Pump Ductless Inverter System, 19 SEER2, Cools Up to 550 Sq. Ft,16.4ft installation kit included

I'm very happy with this heat pump. I really like that I can use the internet timers to ramp the temperature before i get home and keep the unit operating at peak efficiency. I had a glitch with the power failure, but the service people helped me out a lot.

Bought the 21 SEER 12,000 BTU for 700 ft upstairs living area. Worked great to keep in the low 70s all summer. Bought the 19 SEER 12,000 BTU and the 24,000 BTU for the 4-car garage/workshop areas. The only difference between the two 12,000 BTU units was the length of the refrigerant lines. The 21 SEER has a 6 ft line, the 19 SEER has a 25 ft line. We needed longer lines for our garage units. The 21 SEER seemed to work better in keeping the area cool, but the house insulation is better than the workshop. The units did a great job keeping us cool for the 100+ 4-month long Texas summer this year. The reason for 4 stars instead of 5 is because we did not know about the yearly maintenance required to keep these units mold free. There are videos on YouTube that explain how to clean these units to remove mold. The one we liked best was DIYJIM cleaning a Mitsubishi unit. Our unit was harder to clean as Della's blades that move air up and down do not come out. The Mitsubishi's easily slide out to give better access to the side to side airflow blades and water pan. Della should follow Mitsubishi's air flow blade design. I had to wrap a wet cloth around a long thin stick to clean the horizontal airflow blades and surrounding area. I used a 50/50 vinegar/water solution to do this as vinegar kills mold. We used the unit for four months so were happy to only have minor spots of black mold on the horizontal blades. There was no mold on the "hamster cage" cylinder fan so we only had to vacuum it. We did discover that one should leave the unit on 24/7 to allow the unit to remove standing water. We often turned it off if the temperature became too cold. We now will just adjust the unit to a higher temperature. As said before, the units work great and are easy to install/use; however, I do not like the idea of mold growing in the units. I don't think this is a problem with central air conditioners. A couple times towards the end of our 4 months continual use, we had water dripping inside the house off the airflow blades. We believe this was because of excess water due to outside humidity and the unit not draining the water effectively. The a/c man that installed a friend's duckless unit installed it at a slant so the side with the hose line for water removal is slightly lower. Our units were installed level as shown in the instructions. If we were to do it again, we would install them slightly tilted towards the water hose end. They do use less electricity than central, but not as much as we had hoped. Maybe 40% less. The price they are showing now is much lower than what we paid. Our 12,000 units were around $1,000, now it shows them at $700.

Easy to install, very quiet and is fairly effective. Unfortunately heating setpoint on all Della products only goes down to 61F, which means that it's not very useful for heating non-living space like a detached garage. If you just want to prevent freezing in the space and set it to 40F or so, this is not the product for you. The app is nice, but its scheduling function is very limited. You can make a schedule to turn off the unit at a certain time, but you can't toggle the schedule on/off if circumstances change - you have to delete the whole schedule. Schedules are not seasonal, they are daily, so as seasonal needs change, you must manually edit schedules.

UPDATE: Company called me and made things right. Very pleased how they handled the situation. We purchased this unit based on positive reviews, but after having it professionally installed, we’ve encountered numerous issues. The system fails to maintain heat or cool for more than two weeks. We’ve had it serviced three times, initially suspecting a leak, but two companies have examined it and are unable to identify the problem. Consequently, we reached out to the seller. We’ve only received a text message informing us that their service department will contact us, but we’ve never received a call or any assistance from the company. Given the significant investment we’ve made in this faulty system, I strongly advise against purchasing it.

Installed this mini split back in July of 2022, first time doing any HVAC ordered all the necessary equipment for the installation. The unit has out performed my expectations and with the only issue being part of the led temp display not working. It is now December 2 2025 and has gone through multiple summers and winters even -4 temps. Keeping this unit clean is very important not just cleaning the filters. I use a good quality ac foam cleaner every 4 months it's a must for proper operation