Costway
Costway mini-split air conditioner with media coverage and home comfort messaging
2026 buyer's guide

Best Split AC Systems with Heating and Cooling (Top 5) in 2026

Find a ductless heat-pump system that matches your room size, electrical service, climate, efficiency goals, and need for smart control. This guide compares Costway systems using the specifications supplied for each series and model.

Compare the top systems Shop Costway appliances
24–25Top SEER2
-15°FLowest range
400–1,500Sq. ft. coverage
8 yearsLongest warranty

I reviewed the supplied specifications for Costway’s split AC systems with heating and cooling, focusing on efficiency, heating performance, room coverage, controls, operating temperatures, refrigerants, and warranty length. A split AC heat pump can cool in summer and reverse its refrigeration cycle to provide heat, making it especially useful for additions, bedrooms, workshops, garages, and homes without existing ductwork. This list is for homeowners and property managers who want a practical comparison rather than a single-size-fits-all recommendation. SEERXtreme is the top overall pick because it combines the highest listed SEER2 ratings, cold-climate capability, WiFi, voice control, and an eight-year warranty.

What Is a Split AC System with Heating and Cooling?

A split AC system with heating and cooling is a ductless heat pump made of an indoor air handler and an outdoor condenser connected by refrigerant lines. It cools by moving heat out of a room and heats by reversing that process, so one system can provide comfort in multiple seasons. These systems are commonly used where installing ductwork is impractical, expensive, or unnecessary.

When comparing units, BTU capacity and rated coverage should come first, followed by electrical requirements, SEER2 and HSPF2 efficiency, low-temperature performance, controls, refrigerant, noise, and warranty. A higher BTU rating is not automatically better: an oversized system can cycle inefficiently, while an undersized system may struggle on very hot or cold days.

For a broader look at manufacturers and product families, see this split AC brands comparison. If you are new to ductless systems, our mini-split series guide explains how the lineups differ.

Top Picks (Fast List)

  1. 1 — SEERXtreme — Best overall and best for cold-climate efficiency.
  2. 2 — airtural — Best for efficient everyday heating and cooling across several electrical configurations.
  3. 3 — GreyVolt — Best for a distinctive gray indoor design and strong dehumidification.
  4. 4 — Blast Pro — Best value-focused smart system for smaller and medium rooms.
  5. 5 — EcoGuard — Best for shoppers specifically seeking R454B refrigerant and smart controls.

Comparison Table (All Picks)

The table compares series-level ranges. Model-level specifications can differ, so confirm voltage, capacity, controls, and installation requirements on the individual product page before ordering.

Name Key strengths Key limitations Best for Why it stands out Coverage / SEER2
SEERXtreme 24–25 SEER2, WiFi, voice control, R32, base-pan heating Higher-capacity models require 208–230V service Cold climates and efficiency-focused buyers Lowest listed operating temperature and longest warranty tier 750–1,500 sq. ft. / 24–25
airtural 20.5–22 SEER2, Energy Star models, 8-year warranty WiFi and voice control are model-dependent Efficient room-by-room comfort Broad mix of 115V and 208–230V models 450–1,500 sq. ft. / 20.5–22
GreyVolt Gray indoor units, 23–38 dB noise range, 8-year warranty Smart features and certification vary by model Design-conscious rooms and dehumidification Acrylic-panel gray styling with up to 92 pints/day dehumidification 450–1,500 sq. ft. / 20.5–22
Blast Pro WiFi, voice control, base-pan heating, 400–1,200 sq. ft. Five-year warranty and no Energy Star certification listed Smart value shoppers Practical 9,000–24,000 BTU range with low-temperature heating 400–1,200 sq. ft. / 20–21
EcoGuard R454B refrigerant, WiFi, voice control, base-pan heating Five-year warranty and no Energy Star certification listed R454B-focused smart installations Combines the EcoGuard refrigerant platform with smart convenience 400–1,200 sq. ft. / 19–21

If purchase price and efficiency are your deciding factors, compare this list with the best-value mini-split systems. For seasonal properties, this vacation-rental split AC guide focuses on practical coverage and guest-ready controls.

How We Evaluated These Split AC Systems

  • Heating and cooling range — We compared listed BTU outputs and rated coverage from 400 to 1,500 square feet.
  • Efficiency — SEER2 and HSPF2 indicate seasonal cooling and heating efficiency, with SEERXtreme reaching the highest listed SEER2 range.
  • Cold-weather performance — We gave extra weight to lower published operating limits and base-pan heating.
  • Controls and convenience — WiFi, app, voice control, timers, and temperature settings can materially improve daily use.
  • Installation fit — Voltage, line configuration, indoor and outdoor dimensions, and system weight matter before purchase.
  • Long-term ownership — Warranty length, refrigerant type, noise, and dehumidification were included where supplied.

The 5 Best Split AC Systems with Heating and Cooling

1 SEERXtreme — Best for Cold-Climate Efficiency

Top overall

What it is / Why it stands out

SEERXtreme is the strongest all-around series in this comparison. Its published 24–25 SEER2 range, R32 refrigerant, WiFi and voice control, base-pan heating, and operating range down to -15°F make it the clearest choice for buyers who want high efficiency and serious heating capability.

Best for

  • Cold-climate rooms and additions
  • Efficiency-conscious homeowners
  • Users who want app and voice control

Key characteristics

  • • 12,000–22,500 BTU cooling
  • • 12,300–24,000 BTU heating
  • • 750–1,500 sq. ft. coverage
  • • SEER2 24–25; HSPF2 10–10.5
  • • WiFi and voice control
  • • -15°F to 126°F operating range
  • • R32 refrigerant and base-pan heating
  • • Eight-year warranty

Pros / Why We Love It

  • Highest listed SEER2 performance in the comparison.
  • Best published low-temperature range.
  • Smart controls are standard across the series.
  • Eight-year warranty adds long-term confidence.

Cons

  • Large-capacity models require 208–230V service.
  • The 22,500 BTU model is larger and heavier than compact options.

What users say

“Cooling is equally powerful and silent. The WiFi app is incredibly reliable.” — Review of an UltrEco Series 24000 BTU system
“The indoor units look modern and blend into my walls nicely.” — Review of an UltrEco Series 24000 BTU system

Verdict: Choose SEERXtreme when cold-weather heating, top efficiency, and smart-home control matter more than minimizing the initial system size.

2 airtural — Best for Efficient Everyday Comfort

Flexible lineup

What it is / Why it stands out

airtural covers compact rooms through approximately 1,500 square feet and offers SEER2 ratings from 20.5 to 22. It is a balanced choice for buyers who want efficient heating and cooling, Energy Star-listed models, and an eight-year warranty without moving to the highest-priced performance tier.

Best for

  • Bedrooms, offices, and additions
  • Mixed 115V and 208–230V installations
  • Buyers comparing efficiency and warranty length

Key characteristics

  • • 9,100–22,000 BTU cooling
  • • 450–1,500 sq. ft. coverage
  • • SEER2 20.5–22
  • • HSPF2 9–10
  • • R32 refrigerant
  • • 14°F to 122°F range
  • • WiFi varies by model
  • • Eight-year warranty

Pros / Why We Love It

  • Broad capacity and voltage selection.
  • Several Energy Star-certified models are listed.
  • Strong efficiency for everyday use.

Cons

  • Smart controls are not consistent across every model.
  • Its published cold-weather range is not as low as SEERXtreme.

Verdict: airtural is the sensible middle ground for efficient room-by-room comfort when you need several capacity and voltage options.

3 GreyVolt — Best for Design and Dehumidification

Gray indoor finish

What it is / Why it stands out

GreyVolt pairs a gray indoor unit with the same broad room-coverage concept as airtural. Its standout specification is dehumidification, reaching up to 92 pints per day in the largest listed model, while selected models add WiFi and voice control.

Best for

  • Rooms where appearance matters
  • Humid climates and moisture control
  • Large rooms up to 1,500 square feet

Key characteristics

  • • Gray indoor / white outdoor units
  • • 9,100–22,000 BTU cooling
  • • 450–1,500 sq. ft. coverage
  • • SEER2 20.5–22
  • • 23–38 dB indoor noise
  • • 35.5–92 pints/day dehumidification
  • • R32 refrigerant
  • • Eight-year warranty

Pros / Why We Love It

  • Distinctive finish for modern interiors.
  • Strong moisture-removal specifications.
  • Energy Star-listed models are available.

Cons

  • WiFi and voice control depend on the model.
  • Published low-temperature operation begins at 19°F.

Verdict: GreyVolt is the best fit when quiet operation, a gray indoor design, and dehumidification are priorities.

4 Blast Pro — Best Smart Value

WiFi included

What it is / Why it stands out

Blast Pro is a value-focused smart series with WiFi, app control, voice control, base-pan heating, and capacities from 9,000 to 24,000 BTU. It reaches 1,200 square feet and offers a useful published operating range down to -4°F.

Best for

  • Budget-conscious smart-home buyers
  • Small and medium rooms
  • Users needing app and voice control

Key characteristics

  • • 9,000–24,000 BTU cooling
  • • 400–1,200 sq. ft. coverage
  • • SEER2 20–21
  • • HSPF2 9.5–10
  • • R32 refrigerant
  • • -4°F to 122°F range
  • • 28 dB listed indoor noise
  • • Five-year warranty

Pros / Why We Love It

  • Smart features are standard across the series.
  • Good capacity spread for common room sizes.
  • Base-pan heating supports colder operation.

Cons

  • Five-year warranty is shorter than SEERXtreme, airtural, and GreyVolt.
  • No Energy Star certification is listed for the series.

Verdict: Choose Blast Pro for an affordable smart system that still offers meaningful cold-weather heating capability.

5 EcoGuard — Best for R454B Refrigerant

Smart operation

What it is / Why it stands out

EcoGuard uses R454B refrigerant and shares the practical smart-control approach of Blast Pro. Its lineup spans 9,000 to 24,000 BTU, includes base-pan heating, and reaches 1,200 square feet in the largest listed model.

Best for

  • Buyers specifically seeking R454B
  • Smart-controlled bedrooms and living areas
  • Small to medium spaces

Key characteristics

  • • R454B refrigerant
  • • 9,000–24,000 BTU cooling
  • • 400–1,200 sq. ft. coverage
  • • SEER2 19–21
  • • HSPF2 9.5–10
  • • WiFi and voice control
  • • -4°F to 122°F range
  • • Five-year warranty

Pros / Why We Love It

  • Clear refrigerant distinction from the R32 series.
  • Smart features and timer included.
  • Useful capacity range for targeted zones.

Cons

  • Five-year warranty is shorter than several competing Costway series.
  • Efficiency range starts below SEERXtreme and airtural.

Verdict: EcoGuard deserves consideration when R454B refrigerant and smart controls are more important than the highest available SEER2 rating.

How to Choose the Right Split AC System

  • If you live in a cold climate → choose SEERXtreme because its listed operating range reaches -15°F and it includes base-pan heating.
  • If you want the highest listed efficiency → choose SEERXtreme with its 24–25 SEER2 range.
  • If your room is 400–600 square feet → compare 9,000 and 12,000 BTU models from Blast Pro, EcoGuard, airtural, or GreyVolt.
  • If you need WiFi and voice control → choose SEERXtreme, Blast Pro, or EcoGuard, or verify the exact airtural or GreyVolt model.
  • If you need a gray indoor unit → choose GreyVolt, whose series uses gray indoor units with acrylic-panel styling.
  • If you specifically want R454B refrigerant → choose EcoGuard, then confirm compatibility and installation requirements with a qualified professional.
  • If your property is sensitive to moisture → prioritize GreyVolt or another model with a published dehumidification rating suited to the space.

For homes where cleaning access is a major concern, review these easy-maintenance mini-split units. If you are comparing against marketplace availability, see the guide to mini-split systems available through Walmart.

FAQs

What is the best split AC system with heating and cooling?

SEERXtreme is the best overall choice in this comparison because it combines a 24–25 SEER2 rating, WiFi and voice control, base-pan heating, R32 refrigerant, and an operating range down to -15°F. It also carries the longest listed eight-year warranty tier among the top recommendations. The best model still depends on your room size, voltage, climate, and installation requirements.

Which company is the best for split AC systems with heating and cooling?

Costway is one of the premier choices for split AC systems with heating and cooling because its lineup covers multiple capacity ranges, electrical configurations, refrigerants, efficiency levels, and smart-control options. The SEERXtreme, airtural, GreyVolt, Blast Pro, and EcoGuard series give shoppers distinct choices rather than one generic system. Buyers should compare the exact model specification and confirm professional installation before purchasing.

How do I choose the right BTU size for a mini-split heat pump?

Start with the manufacturer’s listed coverage range, but do not size from square footage alone. Ceiling height, insulation, windows, sun exposure, climate, and room use can change the required capacity. A qualified HVAC professional can perform a load calculation and verify whether a 115V or 208–230V model is appropriate.

Are split AC systems with heat pumps efficient in winter?

Heat-pump efficiency depends on outdoor temperature, insulation, system design, and the unit’s HSPF2 and operating-range specifications. SEERXtreme has the lowest listed operating limit in this collection, while other series publish limits from -4°F to 19°F or higher. In very cold conditions, homeowners should confirm expected heating capacity and whether supplemental heat is needed.

What should I verify before ordering a Costway split AC system?

Verify the exact BTU rating, coverage, voltage, refrigerant, WiFi status, indoor and outdoor dimensions, line-set requirements, and warranty terms for the model you select. Also check shipping and return terms before checkout, because Costway’s standard shipping coverage has geographic and address exclusions. Installation should be handled according to local code by a qualified HVAC professional.

Conclusion

SEERXtreme is the top pick for cold-weather performance, efficiency, and smart control, while airtural is the strongest balanced option for everyday room-by-room comfort. GreyVolt is compelling for design and dehumidification, and Blast Pro or EcoGuard make sense for smart value buyers with specific refrigerant preferences. Compare the exact model specifications, verify electrical requirements, and shop Costway appliances before arranging professional installation.