A split unit heat pump gives you one powerful system for heating, cooling, and dehumidifying your home — with no ductwork needed and year-round comfort you’ll notice from the very first day.
Whether you’re cooling a bedroom, heating a large living space, or upgrading a whole floor of your home, these five best-rated split unit heat pumps have you covered for every situation and budget.
| Feature | Senville LETO 24,000 BTU | Senville LETO 18,000 BTU | YITAHOME 12,000 BTU | Cooper & Hunter 18,000 BTU | COSTWAY 24,000 BTU |
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| Capacity | 24,000 BTU (2 Ton) | 18,000 BTU (1.5 Ton) | 12,000 BTU (1 Ton) | 18,000 BTU (1.5 Ton) | 24,000 BTU (2 Ton) |
| SEER Rating | 17 SEER | 19 SEER2 | 20 SEER2 | 19.2 SEER2 | 21 SEER2 |
| Coverage Area | Up to 1,250 sq ft | Up to 1,000 sq ft | Up to 750 sq ft | Up to 1,000 sq ft | Up to 1,500 sq ft |
| Noise Level | 34 dB | 30 dB | ≤41 dB | Quiet operation | ≤25 dB |
| Smart Control | Alexa / Wi-Fi | Alexa / Wi-Fi | Alexa / Wi-Fi | Wi-Fi / App | Alexa / Google / Wi-Fi |
| Warranty | 5-year compressor | 5-year compressor | 5-year compressor | 7-year compressor | 8-year compressor |
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| Product | Image | Capacity | SEER Rating | Coverage Area | Noise Level | Smart Control | Warranty | Buy Now |
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| Senville LETO 24,000 BTU | |
24,000 BTU (2 Ton) | 17 SEER | Up to 1,250 sq ft | 34 dB | Alexa / Wi-Fi | 5-year compressor | |
| Senville LETO 18,000 BTU | |
18,000 BTU (1.5 Ton) | 19 SEER2 | Up to 1,000 sq ft | 30 dB | Alexa / Wi-Fi | 5-year compressor | |
| YITAHOME 12,000 BTU 20 SEER2 | [Image loads via plugin] | 12,000 BTU (1 Ton) | 20 SEER2 | Up to 750 sq ft | ≤41 dB | Alexa / Wi-Fi | 5-year compressor | |
| Cooper & Hunter 18,000 BTU | |
18,000 BTU (1.5 Ton) | 19.2 SEER2 | Up to 1,000 sq ft | Quiet operation | Wi-Fi / App | 7-year compressor | |
| COSTWAY 24,000 BTU 21 SEER2 | |
24,000 BTU (2 Ton) | 21 SEER2 | Up to 1,500 sq ft | ≤25 dB | Alexa / Google / Wi-Fi | 8-year compressor | |
1. Senville LETO Series 24,000 BTU Ductless Split Unit Heat Pump
With close to 8,000 verified reviews and the #1 best-seller ranking in split-system air conditioners, the Senville LETO 24,000 BTU is the most trusted split unit heat pump available — and its real-world performance backs up every one of those reviews.
At 2 tons, it covers up to 1,250 square feet and delivers DC inverter-driven heating and cooling with whisper-quiet 34 dB operation and full Alexa smart home integration right out of the box.
Features
- 24,000 BTU (2 Ton) DC inverter split unit covering spaces up to 1,250 sq ft
- 4-in-1 system: air conditioning, heat pump, dehumidifier, and fan in a single ductless unit
- Alexa-compatible with full Wi-Fi app control for remote and voice management
- Ultra-quiet 34 dB indoor noise — comfortable for bedrooms, living areas, and open plans
- ECO mode reduces energy draw during mild weather for additional monthly savings
- ETL Listed and AHRI Certified; pre-charged with R-410A and 16 ft line set included
Pros
- The most-reviewed and proven split unit heat pump available — nearly 8,000 real buyers
- 4-in-1 functionality eliminates the need for separate AC, heater, and dehumidifier units
- Alexa and app control bring it seamlessly into any existing smart home setup
- 34 dB is genuinely quiet — you’ll barely notice it running even on a still night
- 5-year parts and compressor warranty with free technical and installation support
Cons
- Rated under the older 17 SEER standard — newer SEER2-rated models reflect current testing
- Professional installation required for the 5-year warranty to remain valid
For proven reliability, massive room coverage, and smart home integration backed by thousands of satisfied buyers, the Senville LETO 24,000 BTU is the split unit heat pump you can buy with complete confidence.
For rooms beyond your split unit’s coverage, the best Wi-Fi wall heaters offer smart zone heating wherever you need it most.
Check its current price on Amazon
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2. Senville LETO Series 18,000 BTU Ductless Split Unit Heat Pump
The Senville LETO 18,000 BTU brings the same proven LETO reliability to a 1.5-ton size that is perfect for medium-to-large rooms, delivering an impressive 19 SEER2 efficiency rating and one of the quietest indoor noise levels available at just 30 dB.
With coverage up to 1,000 square feet and full Alexa and Wi-Fi control, it’s the ideal split unit heat pump for master bedrooms, large offices, studio apartments, and open living spaces where comfort and silence both matter.
Features
- 18,000 BTU (1.5 Ton) ductless split unit covering spaces up to 1,000 sq ft
- 19 SEER2 efficiency rating for real, measurable reductions in monthly energy costs
- Exceptionally quiet 30 dB indoor operation — among the quietest units in its class
- Alexa and Wi-Fi app control for full remote management from anywhere
- Operates reliably down to 5°F — dependable heating in most North American climates
- Pre-charged with R-410A; includes 16 ft copper line set and all installation hardware
Pros
- 30 dB indoor noise is barely perceptible — ideal for light sleepers and nurseries
- 19 SEER2 rating delivers consistent energy savings month after month
- 4.5-star rating from nearly 1,800 verified buyers across a trusted platform
- Inverter compressor eliminates temperature swings for steady, consistent comfort
- 5-year parts and compressor warranty with free technical support included
Cons
- Wi-Fi app dongle and Alexa dongle are different accessories — confirm compatibility at purchase
- Step up to the 24,000 BTU model for spaces over 1,000 sq ft
For a mid-sized room where ultimate quiet operation and strong SEER2 efficiency are your top priorities, the Senville LETO 18,000 BTU delivers both in a reliable, smart-home-ready package.
If your home also features a sauna or steam room, pair your split unit with one of the best wet-dry sauna heaters to keep that space comfortably heated year-round as well.
Check its current price on Amazon
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3. YITAHOME 12,000 BTU 20 SEER2 Ductless Split Unit Heat Pump
The YITAHOME 12,000 BTU split unit stands out with the highest SEER2 efficiency on this list at 20 SEER2, combined with a standout HEALTH mode that actively purifies your indoor air while the unit heats or cools — a feature you rarely see at this price point.
Ideal for single-zone spaces up to 750 square feet, it gives you serious energy savings, smart home connectivity, and cleaner indoor air all from one compact ductless wall-mount unit.
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Features
- 12,000 BTU (1 Ton) split unit with 20 SEER2 — highest efficiency rating on this list
- HEALTH mode with negative ion purification, PM2.5 filtration, and electrostatic dust removal
- Alexa and Wi-Fi app control with iFEEL smart temperature sensing built in
- Reliable operation from 5°F to 118°F for dependable all-season performance
- Self-cleaning coil, auto-defrost, and 24-hour timer for low-maintenance daily use
- Pre-charged with eco-friendly R-32 refrigerant; ETL and AHRI certified
Pros
- 20 SEER2 delivers the most energy savings per dollar of any split unit on this list
- HEALTH mode air purification is a standout bonus rarely found at this price range
- Alexa and Wi-Fi are built in — no extra adapters or accessories needed
- Self-cleaning coil keeps indoor air quality high with minimal maintenance effort
- Works reliably down to 5°F — handles cool-climate shoulder seasons with ease
Cons
- Indoor fan can reach up to 41 dB at high speed — slightly louder than Senville models
- No horizontal air swing — vertical airflow only on this model
For single-zone heating and cooling where maximum energy efficiency and better indoor air quality are your two biggest goals, the YITAHOME 12,000 BTU 20 SEER2 delivers both in one smart, affordable split unit package.
For additional dehumidification in rooms where moisture builds up, check out the best dehumidifiers for sunrooms to complement your split unit’s dry mode.
Check its current price on Amazon
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4. Cooper & Hunter 18,000 BTU 19.2 SEER2 Wi-Fi Split Unit Heat Pump
The Cooper & Hunter 18,000 BTU split unit sets itself apart with two things most competitors can’t match — a built-in Wi-Fi module that works right out of the box with no additional adapter required, and an industry-leading 7-year compressor warranty that shows real manufacturer confidence in the product.
Covering up to 1,000 square feet with a 19.2 SEER2 efficiency rating and complete smart home connectivity, this is the split unit heat pump to choose when long-term reliability and hassle-free control are your priorities.
Features
- 18,000 BTU (1.5 Ton) ductless split unit covering spaces up to 1,000 sq ft
- 19.2 SEER2 inverter efficiency for outstanding year-round energy savings
- Built-in Wi-Fi with dedicated app control — no separate dongle or adapter needed
- Industry-leading 7-year compressor warranty and 5-year parts warranty
- Complete 16 ft pre-charged installation kit included; reliable heating down to 5°F
- ETL certified and AHRI listed for verified quality and safety compliance
Pros
- 7-year compressor warranty is the longest on this list — exceptional long-term protection
- Built-in Wi-Fi means instant app control and scheduling with no extra cost or purchases
- 19.2 SEER2 efficiency consistently lowers electricity bills compared to standard systems
- Cooper & Hunter is a reputable brand with strong technical and dealer support
- ETL and AHRI certified for verified performance and safety you can count on
Cons
- Outdoor unit is heavier than some competing models — two-person installation recommended
- Fewer Amazon reviews than Senville models — a newer but growing Amazon presence
If built-in Wi-Fi from day one, the longest warranty on this list, and solid SEER2 efficiency all matter to you, the Cooper & Hunter 18,000 BTU is the split unit heat pump that checks every one of those boxes.
For outdoor entertaining areas near your condenser, also browse the best patio heaters to extend comfortable living space beyond your home’s walls.
Check its current price on Amazon
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5. COSTWAY 24,000 BTU 21 SEER2 Energy Star Split Unit Heat Pump
The COSTWAY 24,000 BTU tops this list for a remarkable combination of coverage, efficiency, and warranty protection — with a 21 SEER2 rating that earns it the Energy Star Most Efficient certification, an ultra-quiet ≤25 dB indoor noise level, and an outstanding 8-year compressor warranty.
Covering spaces up to 1,500 square feet with full Alexa and Google Assistant smart home support, this is the split unit heat pump for buyers who want the most efficient, most protected, and widest-coverage option available.
Features
- 24,000 BTU (2 Ton) split unit with 21 SEER2 — highest SEER2 on this list
- Energy Star Most Efficient certified for maximum energy savings and rebate eligibility
- Whisper-quiet ≤25 dB indoor noise — the quietest large-capacity unit on this list
- Wi-Fi enabled with Alexa and Google Assistant voice control built in
- Self-cleaning system and washable filters for easy, low-effort maintenance
- Industry-leading 8-year compressor warranty for maximum long-term peace of mind
Pros
- 21 SEER2 Energy Star Most Efficient rating means the lowest monthly energy costs on this list
- ≤25 dB is whisper-quiet — comfortable even in open-plan living and dining areas
- 8-year compressor warranty leads the entire list — outstanding ownership protection
- Works with both Alexa and Google Assistant for maximum smart home flexibility
- Self-cleaning function keeps the indoor coil fresh and the air quality high
Cons
- Ships in two boxes — delivery timing between boxes may vary slightly
- Professional HVAC installation required for the full warranty to apply
For the highest efficiency rating, the largest coverage area, the quietest operation, and the longest compressor warranty all in a single split unit heat pump, the COSTWAY 24,000 BTU 21 SEER2 is the standout choice for serious buyers.
If your home also needs additional electric heating backup for extreme cold periods, explore the best heaters for large drafty rooms as a reliable supplement.
Check its current price on Amazon
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Split Unit Heat Pump Buying Guide
When shopping for a split unit heat pump, match BTU capacity to your space (roughly 20–25 BTU per sq ft), prioritize a SEER2 rating above 17 for real energy savings, and look for a DC inverter compressor to avoid the temperature swings of single-stage units. Built-in Wi-Fi saves money versus add-on adapters, and a longer compressor warranty — 7 to 8 years — signals genuine manufacturer confidence in the product’s long-term durability.
Tips for Getting the Best Performance from Your Split Unit Heat Pump
Size it right for your space.
An undersized split unit runs non-stop and still can’t maintain temperature on the coldest or hottest days.
An oversized unit short-cycles constantly, reducing efficiency and causing uncomfortable humidity swings — so match BTU capacity to your square footage before purchasing.
Clean the filters every 4–6 weeks.
All five units on this list include washable filters that take just a few minutes to rinse and dry.
A clean filter maintains peak efficiency, keeps the indoor coil from icing up, and helps your split unit heat pump last the full 15–20 years it was designed for.
Use the smart scheduling features.
Every unit on this list includes a 24-hour timer and most offer full Wi-Fi app scheduling.
Setting the unit to pre-condition your space 30 minutes before you arrive home — rather than leaving it running all day — saves real money over a heating season without any sacrifice in comfort.
Keep the outdoor condenser clear in every season.
Leaves, grass, snow drifts, and overgrown shrubs all restrict airflow around the outdoor unit and force the compressor to work harder.
Keep a 12-inch clearance around all sides of the condenser year-round — especially in winter when the unit is working hardest to extract heat from cold outdoor air.
Book an annual professional service visit.
A licensed HVAC technician can verify refrigerant levels, clean the indoor and outdoor coils, and catch early signs of wear before they become expensive repairs.
Annual maintenance also keeps your warranty conditions met — an important step for units with 7- or 8-year compressor warranties like the Cooper & Hunter and COSTWAY on this list.
Frequently Asked Questions
What is a split unit heat pump and how does it work?
A split unit heat pump consists of two components: an indoor wall-mounted air handler and an outdoor condenser unit connected by refrigerant lines.
In cooling mode it extracts heat from your indoor air and moves it outside; in heating mode it reverses the cycle — extracting heat from outdoor air and moving it inside, even in temperatures as low as 5°F.
This heat transfer process is far more energy-efficient than resistance electric heating, which is why modern split unit heat pumps can deliver 2 to 4 units of heat for every unit of electricity consumed.
Do I need ductwork to install a split unit heat pump?
No — that’s one of the biggest advantages of a ductless split unit heat pump.
The only penetration required is a small hole through the wall for the refrigerant lines, communication cable, and drain hose.
This makes split units ideal for room additions, converted garages, older homes without existing ductwork, and any space where running new ducts would be impractical or expensive.
Can a split unit heat pump be the only source of heating in my home?
In moderate climates, yes — a properly sized split unit heat pump can serve as the primary source of heating and cooling for a single zone or a whole floor of your home.
In climates with extended periods below 0°F, a backup electric heat strip or supplemental heating source is recommended for extreme cold days when outdoor heat extraction becomes less efficient.
What SEER2 rating should I look for in a split unit heat pump?
The current federal minimum for most US regions is 14.3 SEER2 for split system heat pumps installed after January 2023.
Any unit above 17 SEER2 delivers meaningful real-world energy savings, and anything above 20 SEER2 — like the YITAHOME and COSTWAY models on this list — qualifies for Energy Star certification and potential federal rebates or tax credits.
Conclusion
A quality split unit heat pump transforms the comfort and efficiency of your home — delivering year-round heating, cooling, and dehumidifying from a single ductless system that installs without the cost or disruption of ductwork.
For proven reliability and large-space coverage, the Senville LETO 24,000 BTU leads the pack with nearly 8,000 verified buyer reviews.
For the highest efficiency and widest coverage on this list, the COSTWAY 24,000 BTU 21 SEER2 delivers the best SEER2 rating, quietest operation, and longest warranty.
For the best single-zone efficiency in a compact unit, the YITAHOME 12,000 BTU 20 SEER2 gives you the most energy savings per dollar spent.
Whatever your space and priorities, one of these five split unit heat pumps will make your home more comfortable and your energy bills noticeably lower.
For more heating and cooling ideas, explore the best heat pumps for small houses, check out the best heat pumps for apartments, or browse the best electric heat pumps for pools to keep every part of your home perfectly comfortable all year long.