SplitAtlas

Klimaire / Klimaire KIWQ-KOIQ DIY

Klimaire DIY 18k R-454B 230V Mini-Split

Certified capacity
18,000 BTU/h[1]
SEER2
23 SEER2[3]
Heating floor
-13 F[1]
Voltage
230 V[1]
Install path
DIY install

Scaling the DIY line to 18,000 BTU, this 230V head runs SEER2 23, EER2 12.5, and HSPF2 10 on R-454B, with AHRI cold-climate designation. It heats 19,000 BTU at 47F, holds a strong 15,000 BTU at 17F, and keeps 13,600 BTU at 5F. Precharged quick-connect line sets let a capable homeowner install it for a large room without a vacuum pump or gauges.

1 zoneDIY installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) mini-split heat pump indoor wall unit and outdoor condenser kit

Image: Klimaire

Data completeness: 98%
Last sourced
Aug 17, 2026

SplitAtlas score

8.2 / 10

Methodology
Cooling efficiencyAbove average

(23.0 SEER2) among 18k systems

Heating efficiencyBelow average

(10.0 HSPF2) among 18k systems

Cold-weather performanceBelow average

(5F certified capacity: 71.6% of the 47F rating; -13 F heating floor) among 18k systems

NoiseBottom quartile

(34 dBA indoor min / 53 dBA outdoor) among 18k systems

WarrantyBelow average

(5 yr parts / 7 yr compressor) across the catalogue

Installation accessibilityAbove average

(DIY-marketed; 25 ft precharged; 25 ft included line set) across the catalogue

Feature setTop 10%

(8 verified features) across the catalogue

Documentation & partsBottom quartile

(9 manuals; 51 error-code rows) across the catalogue

Key ratings

Rated cooling

18,000BTU/h[1]

Rated heating

19,000BTU/h[1]

Best-fit use cases

Well suited to a large living area, open floor, or sizable addition in a cold climate where a DIY-inclined owner has a 230V circuit ready.

Where this system ranks

Buyer review snapshot

Best for / skip if

Best for

  • High-efficiency shortlists; SEER2 is 23.

Install difficulty

DIY install path, electrical work likely
  • Electrical: 230V; MCA 12 A; breaker/fuse 20 A.
  • Line set: Quick-connect line connections; precharged 25 ft; included 25 ft; max 65 ft.

Alternatives

Availability and price context

  • Sold at Amazon. Open the listing for today's price and stock.

Source date

Model data sourced
Aug 17, 2026
Page reviewed
Jul 23, 2026
Source-backed records
6
Newest source retrieved
Aug 17, 2026

Warranty tiers

Base
3 yr parts - base residential coverage
Registered
5 yr parts / 7 yr compressor - registered residential use within 45 days

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

Review methodology

Strengths

  • Cold-climate heat holding is a highlight: 15,000 BTU at 17F is a shallow drop from 19,000 BTU at 47F, and it stays at 13,600 BTU at 5F.
  • The precharged DIY line set brings 1.5-ton capacity within reach of a skilled homeowner with no vacuum pump.
  • SEER2 23 and HSPF2 10 on low-GWP R-454B deliver premium numbers at value-brand pricing.

Weaknesses

  • Not ENERGY STAR certified, and support depends on a thinner dealer network than Mitsubishi or Daikin.
  • Self-installing a larger head means longer line sets to route carefully and full ownership of commissioning and warranty steps.

Climate suitability

Minimum heating ambient
-13 F[1]
Certified heating at 5F
13,600 BTU/h[3]
Rated heating at 17F
15,000 BTU/h[3]
Rated heating at 47F
19,000 BTU/h[1]

Specifications

Show
Manufacturer
Klimaire
Brand
Klimaire
Product line
Klimaire KIWQ-KOIQ DIY
Model number
KIWQ18H2-45T indoor / KOIQ18H2-45T outdoor
Indoor unit model
KIWQ18H2-45T
Outdoor unit model
KOIQ18H2-45T
Number of zones
1
Max indoor units
not published
Rated cooling capacity
18,000 BTU/h[1]
Rated heating capacity
19,000 BTU/h[1]
Voltage
230 V[1]
MCA
12 A[1]
Maximum fuse or breaker size
20 A[1]
Breaker needed
not published
SEER2
23 SEER2[3]
EER2
12.5 EER2[3]
HSPF2 (Region 4)
10 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
1.8 COP[3]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
5 F[1]
Maximum outdoor temperature
131 F[1]
Indoor noise range
34-50 dB(A)[1]
Outdoor noise rating
53 dBA[1]
Indoor weight
30.9 lb[1]
Outdoor weight
90.4 lb[1]
Refrigerant
R-454B[1]
Refrigerant charge
not published
Manufacturer coverage
1,000 sq ft[1]
Line-set size
1/4 in liquid / 3/8 in suction
Included line-set length
25 ft[1]
Maximum line-set length
65 ft[1]
Max line set per indoor
not published
Maximum elevation difference
49 ft[1]
Max height between indoor units
not published
Wi-Fi support
supported[1]
Energy Star status
Not ENERGY STAR certified[4]
AHRI certification number
218067070[3]
Warranty
Base: 3 yr parts (base residential coverage); Registered: 5 yr parts / 7 yr compressor (registered residential use within 45 days). Score uses Registered.. DIY Mini-Split Systems: 5 years parts / 7 years compressor when registered for residential use within 45 days; base coverage is 3 years parts; commercial use is 3 years parts and compressor.
Install path
DIY install
Retail price
not published
Available retailers
Amazon
Manual links
AHRI public directory record 218067070, Klimaire KIWQ-KOIQ DIY brochure, ENERGY STAR exact check 218067070, KIWQ/KOIQ 2026 Installation and Users Manual, Klimaire mini-split wall-mount collection, 18,000 BTU KIWQ-KOIQ DIY Series Do-It-Yourself High Wall-Mounted Ductless Mini Split Heat Pump Air Conditioner with E-Z Kuick Connect Kit, Klimaire KIWQ-KOIQ DIY product page quick-connect documentation, Klimaire warranty information
Specification sheet
not published
Last sourced date
Aug 17, 2026

Retail purchase context

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price on Amazon

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
12 A[1]
Breaker needed
not published
Maximum breaker size
20 A[1]
Maximum fuse size
20 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
16 AWG, 4-conductor connection wiring[1]

Installation considerations

Show
Liquid line
1/4 in[1]
Suction line
3/8 in[1]
Line connection type
Quick-connect line connections[2]
Precharged length
25 ft[1]
Included line-set length
25 ft[1]
Maximum line-set length
65 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
43.19 x 13.07 x 8.74 in[1]
Outdoor dimensions
36.5 x 14.96 x 27.52 in[1]
Indoor weight
30.9 lb[1]
Outdoor weight
90.4 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) myself, or do I need a pro?
Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) is sold as a DIY-installable system with an included 25 ft line set, so a standard install needs no vacuum pump or gauges. EPA's Section 608 guidance says connecting pre-charged lines still requires technician certification. The electrical circuit is the part that is not DIY: plan on a licensed electrician for the dedicated circuit, and check whether your local permit office requires a permit for the install.
Will the Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 13,600 BTU/h of heating capacity at 5F. Rated heating operation extends down to -13 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 Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) need?
Published electrical requirements: 230 V voltage, 12 A minimum circuit ampacity, and 20 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 is 65 ft. The outdoor unit's factory charge covers up to 25 ft of line; longer runs need added refrigerant. A 25 ft line set is included. Longer runs than the included set allows require a different line set, so measure the planned routing before ordering.
What warranty does the Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) carry?
The manufacturer publishes these warranty tiers: Base: 3 yr parts (base residential coverage); Registered: 5 yr parts / 7 yr compressor (registered residential use within 45 days). Score uses Registered.. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Klimaire Products Inc.: KIWQ09H1-45T & KOIQ09H1-45T technical specificationsSourced - manufacturer technical document

    Covers Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase, Manufacturer wire notes and more

  2. Klimaire Products Inc.: KIWQ/KOIQ 2026 Installation and Users ManualSourced - secondary source

    Covers Line connection type

  3. ENERGY STAR record for AHRI #218067070 - search ENERGY STARSourced - Energy Star listing

    Covers AHRI certification number, COP at 5F, EER2, HSPF2 (Region 4), Rated heating at 17F, Certified heating at 5F and more

  4. ENERGY STAR record for AHRI #218067070 - search ENERGY STARSourced - Energy Star listing

    Covers Energy Star status

  5. AHRI certificate #218067070 - search the AHRI DirectorySourced - AHRI directory

    Covers system.lifecycle_status

  6. Klimaire Products Inc.: Klimaire Warranty Information - DIY Mini-Split SystemsSourced - manufacturer product page

    Covers Legacy compressor warranty value, Legacy warranty value, Registered compressor warranty, Registered warranty conditions, Registered parts warranty, Base warranty conditions and more

Last updated

Jul 23, 2026