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Replacing an old window unit or adding cooling to a garage, sunroom, or home addition? The refrigerant inside the system matters more than you might think. Older ACs used R-410A (a refrigerant with a high global-warming impact). The newer R32 refrigerant (a more efficient coolant with a global-warming potential of 675 versus R-410A at 2,088) works more efficiently, uses less energy, and has a lower environmental impact — and every one of the eight air conditioners on this list uses it.
I’m Min — the founder and writer behind Gadgets Feed. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
This breakdown of the best ac with r32 refrigerant gives you the straight facts on BTU output (cooling power), energy efficiency ratings (SEER2, the seasonal efficiency number), and real-world installation experience so you can buy with confidence.
Quick Picks
- Temprium 9000 BTU Mini Split — Best Overall
- Temprium 12000 BTU Mini Split — Top Performer
- COSTWAY 12000 BTU Mini Split — Best Value
- ACiQ Essentials 12000 BTU Mini Split — Compact Pick
- DELLA Serena 12000 BTU Mini Split — Smart Pick
- Temprium 18000 BTU Mini Split — Large Room Champ
- Cooper & Hunter 15,000 BTU PTAC — PTAC Specialist
- Daikin 18,000 BTU Entra R32 Mini Split — Premium Build
How To Choose The Best AC With R32 Refrigerant
Choosing an AC with R32 refrigerant means you are already picking a more efficient and eco-friendlier option than older systems. But the right pick for your home depends on three things: the size of the room, the type of installation you can handle, and how much control you want over the temperature.
Match the BTU to the Room Size
BTU stands for British Thermal Unit, and it measures cooling power. A 9,000 BTU unit handles rooms up to about 450 square feet, while a 12,000 BTU unit covers up to 750 square feet. Buying too few BTUs means the unit runs nonstop and never catches up; too many BTUs short-cycles and leaves the air clammy. Use the floor area spec in the product data as your guide — it tells you exactly what each unit was designed for.
Understand SEER2 vs Basic Efficiency
SEER2 is a seasonal energy efficiency ratio updated for modern testing standards (it stands for Seasonal Energy Efficiency Ratio 2). A unit rated at 22 SEER2 uses significantly less electricity than one rated at 18 SEER2, especially during mild weather when the compressor runs at partial speed. Inverter-driven compressors (compressors that vary their speed instead of stopping and starting) are what allow these high SEER2 numbers, and they also keep the room temperature steadier — no blast of cold air followed by a warm lull.
Mini-Split or PTAC — Which Fits Your Space?
A mini-split system has an indoor wall-mounted unit connected to an outdoor condenser, and it needs a 3-inch hole through the wall for the line set (the copper pipes that carry refrigerant). It is the most common choice for homes, garages, and additions. A PTAC (Packaged Terminal Air Conditioner) is a single-box unit that slides into a wall sleeve, common in hotels, apartments, and older homes with existing sleeves. PTACs are easier to swap out but are generally louder and less efficient than a mini-split.
Quick Comparison
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| Model | Best For | Cooling Power | Floor Area | SEER2 Rating | Amazon |
|---|---|---|---|---|---|
| Temprium 9000 BTU | Small rooms up to 450 sq. ft. | 9,000 BTU | 450 sq. ft. | 22 SEER2 | $469.99Amazon |
| Temprium 12000 BTU | Mid-sized rooms up to 750 sq. ft. | 12,000 BTU | 750 sq. ft. | 22 SEER2 | $499.99Amazon |
| COSTWAY 12000 BTU | Garages and larger spaces | 12,000 BTU | 750 sq. ft. | 22 SEER2 | $559.99$619.99Amazon |
| ACiQ Essentials 12000 BTU | Versatile small commercial use | 12,000 BTU | 600 sq. ft. | 20 SEER2 | $749.99Amazon |
| DELLA Serena 12000 BTU | Smart-home integration | 12,000 BTU | 550 sq. ft. | 22 SEER2 | $779.96Amazon |
| Temprium 18000 BTU | Large rooms up to 1250 sq. ft. | 18,000 BTU | 1,250 sq. ft. | 20 SEER2 | $799.99Amazon |
| Cooper & Hunter 15000 BTU | Hotel-style PTAC replacements | 15,000 BTU | 800 sq. ft. | High Efficiency | $968.97$1,058.97Amazon |
| Daikin Entra 18000 BTU | Premium long-term investment | 18,000 BTU | 1,000 sq. ft. | 18 SEER2 | $1,722.00Amazon |
In‑Depth Reviews
1. Temprium 9000 BTU Mini Split
A whisper-quiet 9,000 BTU unit that punches well above its size for a small room.
You get a cooling power of 9,000 BTUs and a heating capacity of 9,500 BTUs, all running on a standard 115V household outlet — no expensive electrical work needed. That 22 SEER2 rating (the seasonal energy efficiency ratio) means the inverter compressor adjusts its speed instead of clunking on and off, so your electricity bill stays lower and the temperature stays steady. The unit covers rooms up to 450 square feet, and the annual energy consumption is just 410 Kilowatt Hours Per Year.
Buyers report that installation is “easy install for pros (1.5 hrs)” but note you will need a vacuum pump and gauges to pull the lines down — this is not a plug-and-play window unit. Once set up, owners mention it runs very quietly (as low as 23 dB, quieter than a whisper) and handles both scorching 122°F summer heat and winter temperatures down to 5°F without breaking a sweat.
The WiFi app lets you control 7 operating modes and 7 fan speeds from your phone, and it works with Alexa or Google Assistant. The 133°F self-cleaning function helps keep the indoor coil mold-free between seasonal filter washes. It is a strong pick for a bedroom, home office, or sunroom where you want comfort without the noise.
What Works
- Plugs into a standard 115V outlet — no electrician needed for the circuit
- Lowest noise level of 23 dB is genuinely library-quiet
- Covers 450 sq. ft. while using only 410 kWh per year
The Trade-Offs
- Requires professional installation tools (vacuum pump, gauges)
- Phone control setup can be finicky according to reviewers
- Some buyers dislike the aesthetic of the indoor unit
Reach for this if: You need a quiet, efficient mini-split for a single room up to 450 sq. ft. and have a pro install it.
Look elsewhere if: Your room is larger than 450 sq. ft. or you expect a true DIY plug-and-play experience.
2. Temprium 12000 BTU Mini Split
The bigger sibling to the 9000 BTU model, built to cool up to 750 square feet versus 450 square feet on the same 115V circuit.
This unit delivers 12,000 BTUs of cooling and 12,300 BTUs of heating, covering up to 750 square feet. That is 750 square feet versus 450 square feet for the 9000 BTU model, and 12,000 BTUs versus 9,000 BTUs of cooling power, so it suits a combined living-dining area or a master bedroom suite. At 22 SEER2 and an annual energy consumption of 545 Kilowatt Hours Per Year, it still sips electricity compared to a traditional window unit.
Customers note that installation is “easy install for HVAC pro, not DIY” — the same vacuum pump and gauges requirement applies, and the line set (copper refrigerant pipes) needs to be properly flared. Once running, reviewers point out it produces very cold air and does a better job dehumidifying than their old window units. The noise level stays as low as 23 dB, so it will not disturb sleep.
The WiFi app, 7 modes, 4D auto swing, and voice control are identical to the 9000 BTU model, which is good news if you want a consistent user experience across multiple rooms. The 133°F self-cleaning cycle and washable filter keep maintenance straightforward. If you need more cooling than the 9000 BTU can provide but want to stay on a 115V circuit, this is the natural step up.
Strengths
- Covers 750 sq. ft. on a standard 115V outlet
- High 22 SEER2 with 545 kWh/year keeps power bills manageable
- Very low noise floor (23 dB) for a large-capacity unit
Weaknesses
- Professional HVAC install strongly recommended
- Phone control app can be tricky to connect initially
- Same external appearance as the 9000 BTU model — not everyone loves the look
Best for: Anyone needing to cool up to 750 sq. ft. on 115V power with the efficiency of a 22 SEER2 system.
Consider another if: You want a self-contained unit that slides into a wall sleeve (look at the PTAC pick) or need 230V for higher heating output.
3. COSTWAY 12000 BTU Mini Split
A 12,000 BTU system that covers 750 square feet and comes with a strong warranty package.
The COSTWAY delivers the same 12,000 BTUs of cooling and handles 750 square feet as the Temprium 12000, but adds a 9 HSPF2 heating efficiency rating (the Heating Seasonal Performance Factor 2 — how efficiently it heats), which means it heats your space more efficiently in winter. The inverter compressor and R32 refrigerant keep the GWP (global warming potential) at 675, which is lower than older refrigerants. The unit can cool down to 60°F and heat up to 90°F, and you get 4D auto swing for even air distribution.
Shoppers say that a “12,000 BTU cools 460sqft garage apartment” very effectively and that the outside unit is almost silent. One reviewer noted needing to clean the filter frequently but noted their A/C guy prefers this brand. The biggest selling point for many buyers is the warranty: 5 years on parts and 8 years on the compressor, which is the longest compressor coverage on this list.
The smart control works through an app or with Alexa and Google Assistant, and the 137°F self-cleaning function is hotter than the Temprium models at 133°F, which gives you a bit more margin against mold in humid climates. Keep in mind that installation should be done by a licensed HVAC contractor — it is not a DIY job.
Why It Stands Out
- 8-year compressor warranty is the best coverage on this list
- 9 HSPF2 makes it one of the more efficient heaters in this class
- 13°F self-cleaning function at 137°F
Watch For
- Some buyers report plastic vane issues after a few weeks
- Customer service response can be slow via email
- Must be installed by a pro; warranty likely requires proof
Pick this for: The strongest compressor warranty and efficient heating, especially if you plan to use the heat pump regularly.
skip it if: You are wary of plastic components inside the unit — the vanes have been flagged in a reviewer’s 1-star complaint.
4. ACiQ Essentials 12000 BTU Mini Split
A 12,000 BTU system that ships with a complete 16-foot installation kit and targets rooms up to 600 square feet.
The ACiQ Essentials rates at 20 SEER2 and 10 HSPF2, making it a solid mid-range efficiency choice. It covers 400 to 600 square feet according to the brand, so it is best for a smaller space than the Temprium 12000 or COSTWAY. The included 16-foot line set, mounting plate, rubber feet, and drain line mean you do not have to source parts separately — everything you need for a standard install is in the box.
Owners mention that the unit is “very quiet, blows air to floor” and that installation went smoothly for a skilled DIYer with a vacuum pump. One buyer mentioned the indoor unit is large and heavy, so plan for a two-person lift when mounting it. The SmartLife-SmartHome app works well for remote control, and you get modes like I Feel, Mute, Turbo, and Dry.
The warranty covers 4 years on parts and 6 years on the compressor when you register online, which is decent but not as long as the COSTWAY. The pre-charged R32 refrigerant handles the included line set length without needing extra refrigerant, but you still need to vacuum the lines before opening the valves. This is also rated for a wider operating range — cooling from 5°F to 127°F and heating from -4°F to 75°F.
Good Points
- Complete 16-foot install kit included — no extra shopping
- Heating down to -4°F is better than most mini-splits
- Quiet operation with powerful airflow
Not So Good
- Rated for only 600 sq ft — less coverage than competitors at this BTU
- Wiring instructions can be vague
- Shipping damage reported in a few reviews (cracked valve covers)
Choose this if: You want a self-contained install kit and need heat operation down to -4°F for a colder climate.
Pass if: You need to cover more than 600 square feet — the Temprium or COSTWAY 12000 BTU units are better for larger rooms.
5. DELLA Serena 12000 BTU Mini Split
A 22 SEER2 mini-split with a geo-fencing app feature and a 2025 Red Dot Design Award — the quietest spec on the list.
The DELLA Serena runs on 230V and delivers 12,000 BTUs for rooms up to 550 square feet. It carries a 22 SEER2 rating and the brand claims power savings over a standard unit through its inverter technology. The noise floor drops to 22 dBa in mute mode versus 23 dB for the Temprium line, and it is the quietest spec on this list.
Customers note that the app includes a geo-location function (geo-fencing) that adjusts temperature based on your phone’s location, so the unit can save energy when you leave and pre-cool before you get home. One reviewer compared it directly to a Mitsubishi 9000 BTU system and said the Della “has WiFi, great remote, phone app, display screen, more modes” while the Mitsubishi lacked WiFi. The reviewer noted if it lasts 4+ years, it is an easy winner.
The PureClean tech prevents dust buildup inside the indoor unit, and the bottom heating element on the outdoor unit prevents ice buildup during winter. DELLA offers 24/7 live chat and a lifetime warranty, which stands out. The included 16.4-foot line set uses 1/4″ and 3/8″ copper pipes, and the system comes pre-charged with R32 for up to 25 feet of line set.
What Impresses
- 22 dBa mute mode — the quietest spec on the list
- Geo-fencing app saves energy automatically
- Lifetime warranty and 24/7 live chat support
The Caveats
- Requires 230V — not a drop-in replacement for 115V outlets
- Factory flares on copper lines can be weak; some reviewers suggest pre-cut flexible lines
- App does not support Auto mode temperature range
Go for it if: You value smart-home integration, want the quietest possible operation, and have 230V available.
Skip if: You need a 115V plug-and-play unit or are worried about copper line set quality based on reviewer feedback.
6. Temprium 18000 BTU Mini Split
An 18,000 BTU unit that covers 1,250 square feet and still stays quiet enough for a bedroom — the largest single-room coverage on this list.
This 230V system pumps out 18,000 BTUs of cooling and heating, covering up to 1,250 square feet — big enough for an open-plan living area, a large garage, or a small apartment. It carries a 20 SEER2 rating with an annual energy consumption of 900 Kilowatt Hours Per Year, which is efficient for its size. The noise level stays at 28 dB (still quieter than a whisper) despite the much larger compressor.
Reviewers point out that it “cools well, dehumidifies better” and that the 133°F self-cleaning function reduces maintenance. As with the smaller Temprium models, installation requires a vacuum pump and gauges, and the instructions are the same across the line, so familiarity with one unit translates to the other. One owner reported the phone control setup can be tricky, but the included backlit remote covers all 7 modes and 7 fan speeds.
The operating range is slightly different from the 115V models: rapid cooling works up to 120°F (vs 122°F on the smaller Temprium) and heating down to 5°F. For most climates that is still plenty. The 4D auto swing, Turbo mode, and Follow-Me (I Feel) function are all onboard, giving you the same level of comfort control as the smaller units but scaled up for a larger space.
Biggest Strengths
- Handles up to 1,250 sq. ft. — the largest single-room coverage on the list
- 28 dB is quiet for an 18k BTU system
- Full smart-home control with 7 modes and Wi-Fi
Biggest Drawbacks
- Requires a 230V circuit; not usable with standard 115V outlets
- Installation complexity is higher due to larger line set and weight
- Some buyers found the phone app finicky
Best for: A large open space that needs 18,000 BTUs and you have 230V power already run.
Not for: Anyone expecting a plug-and-play setup or needing to use a standard 115V outlet.
7. Cooper & Hunter 15,000 BTU PTAC
A 15,000 BTU PTAC that slides into an existing wall sleeve — a simple swap for hotel, apartment, or dorm replacements.
This is the only Packaged Terminal Air Conditioner (PTAC — a single box that fits into a standard wall sleeve) on the list. It runs on 230/208V and comes with a 20A power plug (with a reset breaker), so you need to check your receptacle before ordering. It delivers 15,000 BTUs of cooling and includes a built-in 3.5 kW electric heater, covering rooms up to 800 square feet.
Shoppers say that it “slid into existing sleeve” in a 1940s house and provided “instant cooling” and quiet operation. One reviewer who replaced units in a lobby after 26 years ordered two more right away. The smart kit includes both a remote control and app control, which is less common for PTAC units. However, note that the wall sleeve and exterior grille are NOT included — you need to buy those separately if this is a new installation, not a replacement.
The R32 refrigerant is a nice upgrade for a PTAC, as many older PTACs still use R-410A or even R-22 (an older, ozone-depleting refrigerant). The digital control panel with LED display makes it easy to set temperatures without the remote. One customer observed the unit arrived with plumbers putty loose next to a 1.5-inch hole in the back, causing an air leak that needed to be resealed.
Why It Works
- Easiest replacement for existing PTAC sleeves — just slide and plug
- Built-in 3.5 kW electric heater for winter
- Smart app and remote control included
What To Watch
- Sleeve and grille not included for new installations
- One 4-month-old unit reported freezing up and blowing warm air
- Plumbers putty around the back hole can be loose on arrival
Ideal for: Swapping out an old PTAC in a hotel room, apartment, or dorm where the sleeve is already in place.
Avoid if: You need a new wall cut-in (adds cost for sleeve and grille) or want the higher efficiency of a mini-split system.
8. Daikin 18,000 BTU Entra R32 Mini Split
A premium Daikin system with a Titanium Apatite air purifying filter and a variable capacity range from 6,900 to 20,000 BTU — the most sophisticated pick here.
The Daikin Entra is the most premium pick on this list, cooling up to 1,000 square feet with an 18 SEER2 rating, 10.5 EER2 (Energy Efficiency Ratio 2 — a steady-state efficiency measure), and 3.30 COP (Coefficient of Performance — heating efficiency ratio). The cooling capacity spans from a minimum of 6,900 BTUs up to a maximum of 20,000 BTUs — the compressor does not just run at full power or shut off, it modulates across a wide range to match the exact load. Heating capacity runs from 5,800 BTUs up to 22,500 BTUs.
Buyers report that it “keeps the room cool and warm for all seasons” and that installation, while not easy, leads to “quick and efficient” cooling once complete. The included 15-foot Maxwell line set and wall mounting bracket reduce the parts you need to source. The Titanium Apatite Photocatalytic Air Purifying Filter (a filter that uses titanium-coated material and light to trap fine particles and break down odors) goes beyond standard washable mesh — it traps fine particles and breaks down odors, which is a real differentiator for allergy sufferers.
The system operates from 50°F to 115°F for cooling and 5°F to 65°F for heating. It includes Blue Fin Protection on the outdoor coil to resist corrosion, and features like Powerful Operation, ECO+, and Cold Draft Prevention. This is a 230V system, and the indoor unit measures 39.56 inches wide — substantial, but designed for permanent installation in a renovation or new construction.
Premium Perks
- Titanium Apatite Photocatalytic filter is the best air quality feature on this list
- Wide capacity range (6,900-20,000 BTU) for precise temperature control
- Daikin is a major global brand with a proven track record
Premium Trade-Offs
- 18 SEER2 is lower than the 22 SEER2 units above — less energy-efficient
- Requires 230V and professional install
- Max cooling is 1,000 sq ft despite being the most expensive unit
Invest in this if: You want a Daikin brand system with superior air filtration, variable capacity, and long-term reliability for a home addition or renovation.
pass on it if: Maximizing energy efficiency (higher SEER2) is your priority, or your room is under 800 sq ft where the ACIQ or COSTWAY offer better value.
Understanding the Specs
SEER2 (Seasonal Energy Efficiency Ratio 2)
SEER2 is the updated industry standard for measuring how efficiently an AC converts electricity into cooling over an entire cooling season. A higher number means lower electricity bills. For example, a 22 SEER2 unit is rated higher than an 18 SEER2 unit of the same BTU capacity. The “2” in the name reflects a newer test procedure that accounts for real-world duct pressure — even a mini-split without ducts gets tested this way now. If you live in a hot climate and run AC 6+ months a year, paying extra for 22 SEER2 over 18 SEER2 can make a real dent in your monthly bill.
BTU (British Thermal Unit)
BTU measures the cooling power of an air conditioner. One BTU is the amount of energy needed to raise one pound of water by one degree Fahrenheit. For room cooling, think of it as “how fast the unit can pull heat out of the air.” A 9,000 BTU unit is right for about 450 square feet, a 12,000 BTU unit for up to 750 square feet, and an 18,000 BTU unit for up to 1,250 square feet. If your room has high ceilings, large windows facing the sun, or poor insulation, you may want to bump up to the next BTU tier — the unit will hit and hold your set temperature without running at full blast all afternoon.
FAQ
Can I install a mini-split AC myself?
What makes R32 refrigerant better than R-410A?
How do I know which BTU size I need for my room?
Will a 115V mini-split cool as well as a 230V model?
What is the difference between SEER and SEER2?
Does a higher SEER2 rating always save me money?
Can I use a mini-split as my primary heating source in winter?
How often do I need to clean a mini-split filter?
Final Thoughts: The Verdict
Across the board, the best ac with r32 refrigerant winner is the Temprium 12000 BTU Mini Split because it combines the highest efficiency rating (22 SEER2) with the ability to run on a standard 115V outlet while covering up to 750 square feet — it is the most versatile balance of power, efficiency, and installation simplicity. If you want the quietest possible operation with smart geo-fencing features, grab the DELLA Serena 12000 BTU. And for the largest rooms up to 1,250 square feet, the standout is the Temprium 18000 BTU Mini Split on quiet, efficient cooling power.
How We Picked
We do not accept paid placement, and we did not hands-on test every unit. Instead, we match each pick to a real buyer and use-case by comparing the manufacturers’ published specifications against the patterns in verified customer reviews — so you get each pick’s real strengths and trade-offs instead of marketing copy.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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