SplitAtlas

Fujitsu / AIRSTAGE H-series

Fujitsu AIRSTAGE H-series 45k R-32 208/230V 5-Zone Mini-Split

Certified capacity
43,000 BTU/h[2]
SEER2
22 SEER2[2]
Heating floor
5 F[1]
Voltage
230 V[1]
Install path
Professional install

The Fujitsu AIRSTAGE H-series 5-Zone 45k (AOUH45KWAS5) is Fujitsu's largest current multi-zone condenser - 43,000 BTU of cooling and 48,000 of heating across up to five zones on one 208/230V outdoor unit. It carries a certified nominal SEER2 of 22 in the all-non-ducted configuration, EER2 12, current R-32 refrigerant, and ENERGY STAR certification.

Unlike the 4-zone XLTH unit it is a standard (non-XLTH) system, so it is a moderate-climate pick; where winters are severe, the 4-zone XLTH holds heat better. Professional Fujitsu-dealer installation, priced by quote.

5 zonesProfessional installCurrent

Refrigerant generation

R-32 - current-generation refrigerant

This brand doesn't honor its warranty on systems bought online. Buy it through a local contractor who installs it: get quotes from installers in your area, and ask whether they're an authorized dealer for this brand.

Get installation quotes
Error Codes
Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5)

Image: Fujitsu

Data completeness: 97%
Last sourced
Jul 28, 2026

SplitAtlas score

8.2 / 10

Methodology
Cooling efficiencyTop quartile

(22.0 SEER2) among >36k systems

Heating efficiencyBelow average

(10.0 HSPF2) among >36k systems

Cold-weather performanceBottom quartile

(5F certified capacity: 75% of the 47F rating; 5 F heating floor) among >36k systems

WarrantyTop quartile

(10 yr parts / 10 yr compressor) across the catalogue

Feature setBottom quartile

(3 verified features) across the catalogue

Documentation & partsTop 10%

(7 manuals; spec sheet; 36 error-code rows; parts channel) across the catalogue

Not evaluated

  • Installation accessibility — not applicable (professional install)N/A

    professional install - DIY-accessibility not applicable

  • Price-to-value — not evaluatedN/A

    This is a professionally installed, quote-only system, so we can't score its price. Get an installed quote to compare real cost.

    Get a quote

Key ratings

Rated cooling

43,000BTU/hNon-Ducted Indoor Units[2]

Rated heating

48,000BTU/hNon-Ducted Indoor Units[2]

Buyer review snapshot

Best for / skip if

Best for

  • 5-zone projects in the 42k outdoor capacity class.
  • High-efficiency shortlists; SEER2 is 22.

Install difficulty

Complex professional install
  • Electrical: 230V; MCA 29.9 A; breaker/fuse 30 A.
  • Line set: connection type not sourced; precharged 164 ft; max 262 ft.
  • 5-zone condenser; indoor-head matching and branch layout are part of the job.

Alternatives

Availability and price context

Fujitsu sells this system through authorized dealers and contractors, not online, and doesn't honor its warranty on systems bought online. Get installation quotes and ask whether the installer is an authorized Fujitsu dealer.

Purchase channel policy

Fujitsu/GENERAL says online retail sales of its products are not authorized; buyers should treat public online carts as outside the approved purchase channel.

Warranty consequence
Warranty becomes null and void for online purchases.
Authorized channel
Authorized local distributor or contractor channel; password-protected distributor sites are for qualified technicians.

Any online offer for this brand should be treated as a warranty-risk warning, not a recommendation.

Compare online-purchase warranty rules by brand

Source: Fujitsu General America, Inc.: GENERAL AIRSTAGE MINI-SPLITS FAQ - online purchase policy; retrieved Aug 12, 2026.

Source date

Model data sourced
Jul 28, 2026
Page reviewed
Jul 28, 2026
Source-backed records
4
Newest source retrieved
Jul 28, 2026

Warranty tiers

Base
5 yr parts / 7 yr compressor - out-of-box residential coverage
Registered
10 yr parts / 10 yr compressor - registration within 60 days
Program
12 yr parts / 12 yr compressor - Fujitsu Elite contractor installation and registration

The score uses Registered. Additional published terms are shown for reference and not counted in the score.

Review methodology

Strengths

  • Five zones and 45,000 BTU on one outdoor unit - Fujitsu's largest current R-32 multi-zone.
  • Certified nominal SEER2 22 / EER2 12 / HSPF2 10 (all-non-ducted), ENERGY STAR certified.
  • Current low-GWP R-32 refrigerant; Fujitsu dealer support and reliability reputation.
  • Five-zone flexibility from one condenser and one circuit.

Weaknesses

  • Professional dealer installation required; quote-based pricing.
  • Standard (non-XLTH): for hard winters the 4-zone AIRSTAGE XLTH heats far better in deep cold, and Mitsubishi's Hyper-Heat multi-zone covers larger cold-climate whole homes.
  • 45,000 BTU across five zones is modest per room - size each head to its room.
  • Multi-zone part-load penalty at low demand; no 2-3 zone option in Fujitsu's current R-32 multi lineup.

Climate suitability

Minimum heating ambient
5 F[1]
Certified heating at 5F
36,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating at 17F
31,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating at 47F
48,000 BTU/hNon-Ducted Indoor Units[2]

Specifications

Show
Manufacturer
Fujitsu
Brand
Fujitsu
Product line
AIRSTAGE H-series
Model number
AOUH45KWAS5
Indoor unit model
Depends on the indoor units you choose
Outdoor unit model
AOUH45KWAS5
Number of zones
5
Max indoor units
5 units[1]
Rated cooling capacity
43,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating capacity
48,000 BTU/hNon-Ducted Indoor Units[2]
Voltage
230 V[1]
MCA
29.9 A[1]
Maximum fuse or breaker size
30 A[1]
Breaker needed
not published
SEER2
22 SEER2Non-Ducted Indoor Units[2]
EER2
12 EER2Non-Ducted Indoor Units[2]
HSPF2 (Region 4)
10 HSPF2Non-Ducted Indoor Units[2]
HSPF2 (Region 5)
Varies by indoor-unit combination
COP
not published
COP at 47F
not published
COP at 5F
not published
Minimum outdoor heating temperature
5 F[1]
Minimum outdoor cooling temperature
14 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
Depends on the indoor units you choose
Outdoor noise rating
56 dBA[1]
Indoor weight
Depends on the indoor units you choose
Outdoor weight
163 lb[1]
Refrigerant
R-32[2]
Refrigerant charge
106 oz[1]
Manufacturer coverage
not published
Line-set size
1/4 in x 3 + 1/4 in x 2 liquid / 3/8 in x 3 + 1/2 in x 2 suction
Included line-set length
Depends on the indoor units you choose
Maximum line-set length
262 ft[1]
Max line set per indoor
82 ft[1]
Maximum elevation difference
49 ft[1]
Max height between indoor units
33 ft[1]
Wi-Fi support
Depends on the indoor units you choose
Energy Star status
ENERGY STAR certified[3]
AHRI certification number
215735280Non-Ducted Indoor Units[2]
Warranty
Base: 5 yr parts / 7 yr compressor (out-of-box residential coverage); Registered: 10 yr parts / 10 yr compressor (registration within 60 days); Program: 12 yr parts / 12 yr compressor (Fujitsu Elite contractor installation and registration). Score uses Registered. Additional published terms are shown for reference and not counted in the score.. Standard 5-year parts / 7-year compressor warranty; licensed-contractor registration can extend to 10-year parts and compressor, or 12-year parts and compressor with Elite Contractor registration.
Install path
Professional install
Retail price
Authorized dealers only
Available retailers
not published
Manual links
AHRI public detail 215735280, ENERGY STAR exact row 215735280, Fujitsu Connect product AOUH45KWAS5, Fujitsu AIRSTAGE H-series official product page, AOUH45KWAS5 Fujitsu AIRSTAGE H-series submittal, Fujitsu AIRSTAGE R-32 warranty statement
Specification sheet
AOUH45KWAS5 Fujitsu AIRSTAGE H-series submittal
Last sourced date
Jul 28, 2026

Parts and filters

Fits Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

supplied-accessory

Fujitsu drain pipe

Fits
Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5)
Fit note
Fits AOUH45KWAS5. The design and technical manual lists this as a supplied accessory, not as an orderable replacement SKU. Source through Fujitsu support or an authorized dealer with the model and serial number.
Source
Fujitsu AOUH45KWAS5 Design & Technical Manual, 15. Accessories - 15-4. Models: AOUH45KWAS5 and AOUH45KWBS5, page p. 258 (Drain pipe 1)

supplied-accessory

Fujitsu drain cap set

Fits
Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5)
Fit note
Fits AOUH45KWAS5. The design and technical manual lists this as a supplied accessory, not as an orderable replacement SKU. Source through Fujitsu support or an authorized dealer with the model and serial number.
Source
Fujitsu AOUH45KWAS5 Design & Technical Manual, 15. Accessories - 15-4. Models: AOUH45KWAS5 and AOUH45KWBS5, page p. 258 (Drain cap 3)

supplied-accessory

Fujitsu adapter K fitting

Fits
Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5)
Fit note
Fits AOUH45KWAS5. The design and technical manual lists this as a supplied accessory, not as an orderable replacement SKU. Source through Fujitsu support or an authorized dealer with the model and serial number.
Source
Fujitsu AOUH45KWAS5 Design & Technical Manual, 15. Accessories - 15-4. Models: AOUH45KWAS5 and AOUH45KWBS5, page p. 258 (Adapter K 1/2 in (12.70 mm) to 3/8 in (9.52 mm) 2)

supplied-accessory

Fujitsu adapter H fitting

Fits
Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5)
Fit note
Fits AOUH45KWAS5. The design and technical manual lists this as a supplied accessory, not as an orderable replacement SKU. Source through Fujitsu support or an authorized dealer with the model and serial number.
Source
Fujitsu AOUH45KWAS5 Design & Technical Manual, 15. Accessories - 15-4. Models: AOUH45KWAS5 and AOUH45KWBS5, page p. 258 (Adapter H 3/8 in (9.52 mm) to 1/2 in (12.70 mm) 1)
Replacement Parts & Filters

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
29.9 A[1]
Breaker needed
not published
Maximum breaker size
30 A[1]
Maximum fuse size
not published
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
not published

Installation considerations

Show
Liquid line
1/4 in x 3 + 1/4 in x 2[1]
Suction line
3/8 in x 3 + 1/2 in x 2[1]
Line connection type
not published
Precharged length
164 ft[1]
Included line-set length
Depends on the indoor units you choose
Maximum line-set length
262 ft[1]
Max line set per indoor
82 ft[1]
Max height between indoor units
33 ft[1]
Indoor dimensions
Depends on the indoor units you choose
Outdoor dimensions
39-5/16 x 37 x 12-5/8 in[1]
Indoor weight
Depends on the indoor units you choose
Outdoor weight
163 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5) myself, or do I need a pro?
Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5) is built for professional installation: the line set must be flared, evacuated, and charged, which requires EPA-certified refrigerant handling. Installing it outside the manufacturer's requirements can void the warranty, so budget for a qualified HVAC installer.
Will the Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 36,000 BTU/h of heating capacity at 5F. Rated heating operation extends down to 5 F. Certified heating efficiency is 10 HSPF2. Match those numbers against your climate's design temperature - in cold regions, output at 5F matters far more than the nameplate capacity measured at 47F.
What electrical circuit does the Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5) need?
Published electrical requirements: 230 V voltage, 29.9 A minimum circuit ampacity, and 30 A maximum breaker or fuse sizing. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
How far can the outdoor unit be from the indoor head?
The published maximum line-set length from the outdoor unit to one indoor head is 82 ft. The combined piping limit across all heads is 262 ft. The outdoor unit's factory charge covers up to 164 ft of line; longer runs need added refrigerant. Measure the planned routing before ordering.
What warranty does the Fujitsu AIRSTAGE H-series 5-Zone 45,000 BTU R-32 208/230V (AOUH45KWAS5) carry?
The manufacturer publishes these warranty tiers: Base: 5 yr parts / 7 yr compressor (out-of-box residential coverage); Registered: 10 yr parts / 10 yr compressor (registration within 60 days); Program: 12 yr parts / 12 yr compressor (Fujitsu Elite contractor installation and registration). Score uses Registered. Additional published terms are shown for reference and not counted in the score.. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Fujitsu General America, Inc.: AOUH45KWAS5 Fujitsu AIRSTAGE H-series multi-zone submittalSourced - manufacturer technical document

    Covers Frequency, electrical_spec.guaranteed_voltage_range, Maximum breaker size, Minimum circuit ampacity, Phase, Voltage and more

  2. Air-Conditioning, Heating, and Refrigeration Institute: AHRI public detail 215735280Sourced - AHRI directory

    Covers AHRI certification number, Rated cooling capacity, EER2, Rated heating capacity, HSPF2 (Region 4), Rated heating at 17F and more

  3. ENERGY STAR: ENERGY STAR exact row check for AHRI 215735280Sourced - secondary source

    Covers Energy Star status

  4. Fujitsu General America, Inc.: Fujitsu AIRSTAGE MINI-SPLITS warranty page and R-32 warranty statementSourced - secondary source

    Covers Additional published compressor warranty, Additional published warranty conditions, Additional published parts warranty, Legacy compressor warranty value, Legacy warranty value, Registered compressor warranty and more

Last updated

Jul 28, 2026