18K BTU Tempestas Inverter Ductless Mini-Split Air Conditioner and Heat Pump
4 reviews
$2,399.99
Experience perfect temperature control all year long with Tempestas—the Smart Air Conditioner + Heater. Designed with a powerful mini-split inverter and heat pump, this sleek unit efficiently cools and heats spaces up to 750ft², ensuring optimal comfort no matter the weather. The impressive 21.2 SEER2 rating and 18,000 BTU deliver exceptional energy efficiency, keeping your space comfortable while reducing operational costs. With smart connectivity, you can adjust settings from anywhere using your smartphone, voice commands, or the included remote—providing total control at your fingertips. Stay cozy in winter, cool in summer, and comfortable every day in between.
What's Included
Box 1 of 2
Indoor Smart WiFi AC + Heater
Condensate drain tube (2 pieces)
16.4ft Electrical Connection Cable
Wall bracket for indoor unit
Installation template with bubble level
Remote control
User guides and Warranty
Box 2 of 2
Outdoor Heat Pump Condenser
14.8ft Copper line set (suction and pressure)
Piping and drain umbilical bandage wrap (2 rolls)
Wall grommet
Sealing putty
Condensate drain elbow with seal for outdoor unit
Key Features
No Ductwork Needed Ideal for any home, even without existing ducts. Save on installation costs with a hassle-free, non-invasive setup, and enjoy year-round comfort—no major renovations required.
Energy Efficient Comfort The Tempestas Smart Air Conditioner + Heater delivers powerful and efficient airflow while consuming less power for eco-friendly living.
Zoned Temperature Control Heat or cool individual rooms independently with each zone operating separately to maintain different temperatures in different areas.
Silent System/ Quiet Operation The Tempestas Smart Air Conditioner + Heater delivers ultra-powerful airflow for high-speed cooling with quiet performance all year round, making it a quieter solution to traditional HVAC systems.
Works with Alexa or Google Assistant Connect the Air Conditioner + Heater to your Alexa or Google Assistant-enabled devices for voice control.
Specifications
Cooling Capacity: 18,000 BTU
Special Features: Atomi Smart App Controlled, Remote Controlled, Voice Controlled
Free Shipping & Returns Free standard shipping on all orders in the United States (excluding PO Boxes, Alaska and Hawaii). Free 30-day returns on any order shipped within the contiguous United States (lower 48 states). Return policy exclusions apply.
Limited 5-Year Parts / 7-Year Compressor Warranty We warrant that each Atomi Smart Tempestas Air Conditioner + Heater is free from manufacturing defects. If a genuine unit sold by an authorized retailer is found to be defective, we will, at our discretion, replace or repair the parts and/or compressor.
Adjust the cooling temperature and fan speed between 5 options—auto, low, medium, high, or turbo—for year-round comfort, ensuring the perfect airflow for any season.
Adjustable Heating
Easily switch to heating mode for your ideal warmth and stay cozy all season long. Save your favorite settings and recall them over again.
Vent Mode
Activate Vent Mode for an energy-efficient way to maintain performance, improve air circulation, and help reduce utility costs.
Activate Oscillation
Easily activate horizontal or vertical oscillation for wider air distribution, ensuring consistent comfort throughout your space.
Set a Schedule
Schedule your smart air conditioner to optimize comfort and set the perfect ambiance from day to night.
Learn more about how Atomi Smart works with Alexa and Google Home on our Smart Integrations page.
Technical Specs
Specifications
BTU: 18,000
Unit Type: Indoor and Outdoor
AC Type: Ductless Heat Pump Mini Split System
Max Room Size: 750ft²
SEER2: 21.2
HSPF2: 8.9
Power Supply: 240VAC, 60Hz, 1PH
Energy Use: 1343 Watts
Features
Fan Modes: 5 (Cool, Heat, Dry, Fan, and Auto)
Fan Speeds: 5 (Auto, Low, Medium, High, and Turbo)
ECO Mode: Yes
Countdown and Scheduling: Yes
Display: ON/OFF
Materials
Indoor Unit Material: Plastic (ABS/HIPS/PP)
Outdoor Unit Material: Steel frame, Zinc Plated, Powder-Coated Steel Enclosure
Filters
Filter Type: Activated Carbon Filter and Silver Ion Filters
Performance
Airflow (CFM): 735
Cooling Current: 8.1A
Heating Current: 7.2A
Dimensions & Weight
Indoor Unit Dimensions: 43.31 x 12.60 x 9.06 inches (1100 x 320 x 230 mm)
Indoor Unit Weight: 30.87lb (14kg)
Outdoor Unit Dimensions: 32.80 x 12.68 x 25.79 inches (833 x 322 x 655 mm)
Outdoor Unit Weight: 85.98lb (39kg)
Total System Dimensions: 45.98 x 16.61 x 41.14 inches (1168 x 422 x 1045 mm) [View Image]
Total System Weight: 130.07lb (59kg)
Connectivity & Controls
Remote Control: Yes
Smart Control: Atomi Smart App
WiFi Setup: Yes (Only supported on 2.4GHz WiFi networks)
Smart Home Assistants: Amazon Alexa, Google Assistant
Additional Features
Certifications: Energy Star, CSA, FCC, PROP 65 Compliant
Warranty: 5-Year Parts / 7-Year Compressor Limited Warranty
FAQ's
Please visit our Help Center page for more help and troubleshooting tips.
What are the dimensions of the Tempestas air conditioner?
The Tempestas air conditioner indoor unit is 43.31 x 12.60 x 9.06 inches, and the outdoor unit is 33.36 x 12.68 x 24.41 inches, providing the optimal temperature in large rooms. [View Image]
How does an Atomi Smart Tempestas Smart Air Conditioner + Heater work?
A mini-split system uses a heat pump to provide both cooling and heating by transferring heat between indoor and outdoor units. It operates without ductwork, making it highly efficient.
What size Tempestas unit do I need for my space?
It depends on the square footage of your room. Our recommendations are:
12,000 BTU – Up to 500ft²
18,000 BTU – Up to 750ft²
Can I install an Atomi Smart Tempestas unit myself?
No, the 12000 BTU and 18000 BTU Tempestas indoor and outdoor units require a licensed HVAC technician. DIY installation will void the warranty.
How can I control the Smart Air Conditioner + Heater?
You can control the Tempestas unit using the Atomi Smart app on your smartphone, voice commands via Alexa or Google Assistant, or with the included remote control for added convenience.
How energy efficient is the Tempestas unit?
Tempestas units have high SEER and HSPF2 ratings and are ENERGY STAR® certified, helping to lower costs and reduce energy consumption.
Still have questions?
Visit our Help Center for troubleshooting, step-by-step guides, helpful resources, and quick answers to common questions. Our team is dedicated to making sure you have everything you need.
5 stars: 4 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)
L
LeeN
Great features and value
Purchased in September 2025 and has been in service since October. This is a very thorough complete system. Arrived well packaged but somehow there was a dent in the cabinet. I contacted Atomi and they shipped the replacement panel as soon as they had stock. I feel like this was a lot of features and initial quality for the money. Time will tell how it holds up. Installed in attached garage and am pleased with the performance for a 24' X 36' garage with large garage door opening multiple times per day. It has maintained the temperature with outside temps in the single digits this month!
A
Appleman
Great Mini Split 18k BTU Complete Kit.
Great Value for a complete kit. Our local AC company installed and complimented the Mini Split and included accessories. Installed in a detached garage/workshop. Blows strong cold air or heat. There is a button on remote or the app that makes the vent oscillate side to side or up and down or both. Has a dehumidify feature. The Atomi rep even reached out after i made an inquiry to make sure the installation went ok. p.s. we found out the beeping can be turned off disabling the buzzer in the app. The warranty requires a licensed HVAC company do the install/vacuum freon process.
D
Danny
Split system
Works great
B
Bob H
Outstanding product
Super quiet and very efficient unit. My living space is 800 sq. ft. Temperatures often exceed 100 degrees outside where I live and this unit does an exceptional job keeping my space cool. Highly recommend this product.
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