SEER2
ACIQ ACIQ-18ZPL-HP230C: 21.4. MRCOOL DIYHH-18-HP-C-230D25-O: 21.2. ACIQ ACIQ-18ZPL-HP230C is certified 0.2 points higher.
Certified spec comparison
ACIQ 18,000 BTU Wall-Mount vs MRCOOL DIY 18,000 BTU Wall-Mount
ACIQ ACIQ-18ZPL-HP230C vs MRCOOL DIYHH-18-HP-C-230D25-O
These two products come from different brands and share the same rounded certified heating-capacity class.
Why compare these models?
Both are 18k BTU-class heat pumps. Here is where they differ.
Certified field comparison
| Field | ||
|---|---|---|
| Brand | ACIQ | MRCOOL |
| Outdoor model | ACIQ-18ZPL-HP230C | DIYHH-18-HP-C-230D25-O |
| Heating capacity at 47F | 18,000 BTU/h | 18,000 BTU/h |
| Heating capacity at 17F | 18,000 BTU/h | 15,200 BTU/h |
| Heating capacity at 5F | 18,000 BTU/h | 18,000 BTU/h |
| SEER2 | 21.4 | 21.2 |
| HSPF2 | 11 | 11 |
| Voltage | 208/230V | 208/230V |
| Certified flags | ENERGY STAR-certifiedccASHP-listed | ENERGY STAR-certifiedccASHP-listed |
Compare sellers
ACIQ 18,000 BTU Wall-Mount
Compare sellers
MRCOOL DIY 18,000 BTU Wall-Mount
Check model number DIYHH-18-HP-C-230D25-O / DIY-18-HP-WMAH-230D25-O at your preferred retailer.
All values come from official certification records; “not supplied” means the source does not publish that value. Open either model page for source links and retrieval dates.
Cold-weather output: what each system still delivers when it gets cold
A heat pump's headline capacity is measured at 47°F. What matters in January is how much of that output survives at 17°F and 5°F. The cold-climate specification exists because two systems with the same 47°F rating can behave very differently at design temperature.
| Certified heating output | ACIQ ACIQ-18ZPL-HP230C | MRCOOL DIYHH-18-HP-C-230D25-O |
|---|---|---|
| At 47°F | 18,000 BTU/h | 18,000 BTU/h |
| At 17°F | 18,000 BTU/h | 15,200 BTU/h |
| At 5°F | 18,000 BTU/h | 18,000 BTU/h |
| Cold-climate listed | Yes, on the NEEP cold-climate list | Yes, on the NEEP cold-climate list |
ACIQ ACIQ-18ZPL-HP230C holds 100% of its 47°F output at 5°F. That is more than the 82% average across the 125 certified models in the same size class.
MRCOOL DIYHH-18-HP-C-230D25-O holds 100% of its 47°F output at 5°F. That is more than the 82% average across the 125 certified models in the same size class.
Output figures come from the ENERGY STAR Certified Mini-Split Air Conditioners dataset; cold-climate listing comes from the NEEP cold-climate air-source heat pump product list. Retention percentages are calculated from those two published outputs.
Efficiency, and what each rating actually measures
EER2
ACIQ ACIQ-18ZPL-HP230C: 12.5. MRCOOL DIYHH-18-HP-C-230D25-O: 12.5. The two are certified at the same figure.
HSPF2
ACIQ ACIQ-18ZPL-HP230C: 11. MRCOOL DIYHH-18-HP-C-230D25-O: 11. The two are certified at the same figure.
ACIQ ACIQ-18ZPL-HP230C matches the 21.4 SEER2 average of the 125 certified models in its size class, and sits above the 10.2 HSPF2 average of the 125 certified models in its size class.
MRCOOL DIYHH-18-HP-C-230D25-O sits below the 21.4 SEER2 average of the 125 certified models in its size class, and sits above the 10.2 HSPF2 average of the 125 certified models in its size class.
SEER2, EER2, and HSPF2 come from the ENERGY STAR Certified Mini-Split Air Conditioners dataset. Size-class averages are calculated across every certified model in this catalog rounded to the same capacity class.
Electrical and installation requirements
These decide whether a system is workable in a given house before efficiency matters at all. A model that needs a service you do not have is not a candidate.
| Requirement | ACIQ ACIQ-18ZPL-HP230C | MRCOOL DIYHH-18-HP-C-230D25-O |
|---|---|---|
| Electrical service | 208/230V | 208/230V |
| Minimum circuit ampacity | Not published in the certification records | 19 A |
| Maximum breaker or fuse | Not published in the certification records | 25 A |
| Line set length range | 98.4 ft | Not published in the certification records |
Electrical values are carried through from the certification records where the registries publish them. Confirm the final circuit requirement with a licensed electrician against the installation manual for the exact unit you buy.
Where these numbers come from
Three public registries stand behind this page. Each one answers a different question, and none of them is a review site.
ENERGY STAR
Certified heating and cooling output, SEER2, EER2, and HSPF2 for every mini-split that carries the ENERGY STAR mark.
ENERGY STAR Certified Mini-Split Air Conditioners dataset ↗NEEP cold-climate list
Which systems meet the cold-climate specification, including the low-temperature output a system has to hold to qualify.
NEEP cold-climate air-source heat pump product list ↗AHRI Directory
The certificate that ties one outdoor unit to one indoor unit and fixes the ratings for that exact pairing.
AHRI Directory of Certified Product Performance ↗| Certification status | ACIQ ACIQ-18ZPL-HP230C | MRCOOL DIYHH-18-HP-C-230D25-O |
|---|---|---|
| AHRI reference number | 216032336 | 216032551 |
| ENERGY STAR | Certified | Certified |
| NEEP cold-climate list | Listed | Listed |
Records retrieved 2026-08-09. An AHRI certificate covers one outdoor unit paired with one indoor unit; a different indoor unit means a different certificate and different numbers.
What this comparison cannot tell you
Certified data settles output, efficiency, and cold-weather behaviour. It does not settle what a system costs to install in your house, how long the parts warranty runs, whether a local contractor will service the brand, or whether the unit fits the wall you had in mind. Those answers come from a quote and from the installation manual, not from a registry.
Capacity is a starting point, not a sizing decision. Two rooms with the same square footage can need different equipment once insulation, glazing, ceiling height, and climate zone are counted. Use a room-by-room load calculation before you buy either of these systems.
Check your room size