Certified-data shortlist

Small-room mini-split picks under 500 sq ft

Models are limited to certified heating output of 12,600 BTU/h or less, a screening range for smaller rooms. Confirm the final size with a load calculation.

Start with the right size class, then compare the published efficiency and performance numbers.

Illustration: small home office with a wall-mounted ductless mini-split indoor head

Source-backed shortlist

9 picks from 202 matching models.

How these picks are ranked: Grouped by heating size, then ranked by SEER2 (cooling efficiency) and HSPF2 (heating efficiency). Lower certified heating output breaks remaining ties. Source: official certification records only.

6,000 BTU class

Top 3 of 10 matching models in this size class.

See all 92 in this size ↗

#1 in this size

ACIQ ACIQ series unit (same housing as ACIQ-06ZPL-HP230B)

Same housing as ACIQ-09ZPL-HP230B; small details may differ.

26.5 SEER2

ACIQ 7,000 BTU Wall-Mount

Good for small rooms around 250–300 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number ACIQ-06ZPL-HP230B / ACIQ-06W-HH-MC at your preferred retailer.

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Model #: ACIQ-06ZPL-HP230B / ACIQ-06W-HH-MC

Also sold as DIYCOOL ACIQ-06ZPL-HP230B

#2 in this size

ACIQ ACIQ series unit (same housing as ACIQ-06ZPL-HP230C)

Same housing as ACIQ-09ZPL-HP230C; small details may differ.

25.5 SEER2

ACIQ 7,000 BTU Wall-Mount

Good for small rooms around 250–300 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number ACIQ-06ZPL-HP230C / ACIQ-06W-HH-MD at your preferred retailer.

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Model #: ACIQ-06ZPL-HP230C / ACIQ-06W-HH-MD

#3 in this size

Senville SENA-06HF-OG outdoor mini-split unit

Photo of this model. Image details

25.5 SEER2

Senville 7,000 BTU Wall-Mount

Good for small rooms around 250–300 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number SENA-06HF-OG / SENA-06HF-IGG at your preferred retailer.

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Model #: SENA-06HF-OG / SENA-06HF-IGG

9,000 BTU class

Top 3 of 76 matching models in this size class.

See all 92 in this size ↗

#1 in this size

ACIQ ACIQ-09ZPL-HP230C outdoor mini-split unit

Photo of this model. Image details

27.2 SEER2

ACIQ 9,000 BTU Wall-Mount

Good for bedrooms or offices around 350–400 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number ACIQ-09ZPL-HP230C / ACIQ-09FM-HH-MD at your preferred retailer.

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Model #: ACIQ-09ZPL-HP230C / ACIQ-09FM-HH-MD

#2 in this size

ACIQ ACIQ-09ZS-HP230C outdoor mini-split unit

Photo of this model. Image details

26 SEER2

ACIQ 9,000 BTU Wall-Mount

Good for bedrooms or offices around 350–400 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number ACIQ-09ZS-HP230C / ACIQ-09FM-HH-MD at your preferred retailer.

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See full specs ↗

Model #: ACIQ-09ZS-HP230C / ACIQ-09FM-HH-MD

#3 in this size

Photo of this model. Image details

26 SEER2

ACIQ 9,000 BTU Wall-Mount

Good for bedrooms or offices around 350–400 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number ACIQ-09ZS-HP230C / ACIQ-12FM-HH-MD at your preferred retailer.

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Model #: ACIQ-09ZS-HP230C / ACIQ-12FM-HH-MD

12,000 BTU class

Top 3 of 116 matching models in this size class.

See all 129 in this size ↗

#1 in this size

Senville SENE-09EL-OH outdoor mini-split unit

Photo of this model. Image details

33.3 SEER2

Senville 12,000 BTU Wall-Mount

Good for bedrooms or offices around 450–550 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number SENE-09EL-OH / SENE-09EL-IHH at your preferred retailer.

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Model #: SENE-09EL-OH / SENE-09EL-IHH

#2 in this size

Senville SENE-12EL-OH outdoor mini-split unit

Photo of this model. Image details

29.4 SEER2

Senville 12,000 BTU Wall-Mount

Good for bedrooms or offices around 450–550 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number SENE-12EL-OH / SENE-12EL-IHH at your preferred retailer.

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Model #: SENE-12EL-OH / SENE-12EL-IHH

#3 in this size

ACIQ ACIQ-09ZPL-HP230B outdoor mini-split unit

Photo of this model. Image details

28.1 SEER2

ACIQ 12,000 BTU Wall-Mount

Good for bedrooms or offices around 450–550 sq. ft. and cold climates.

ENERGY STAR-certifiedccASHP-listed

Check model number ACIQ-09ZPL-HP230B / ACIQ-09W-HH-MB at your preferred retailer.

We may earn a commission when you buy through seller links on this site. Learn more.

See full specs ↗

Model #: ACIQ-09ZPL-HP230B / ACIQ-09W-HH-MB

Also sold as DIYCOOL ACIQ-09ZPL-HP230B