MRCOOL logo18,000 BTU heat pump

MRCOOL DIY 18,000 BTU Wall-MountDIY-18-HP-C-230C / DIY-18-HP-WMAH-230C25

AHRI reference 207339188

Every spec on this page comes from an official certification record or a cited manufacturer document. The source is linked next to each value.

MRCOOLDIYMini-split heat pump
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Where to buy

Check model number DIY-18-HP-C-230C / DIY-18-HP-WMAH-230C25 at your preferred retailer.

MRCOOL 18k wall mount mini-split representative product photo from HVACDirect

Representative same-brand, same-size, same-form-factor product photo; small details may differ. Image details

Community sentiment

What owners report

These are recurring themes in linked public owner discussions, not certified specifications or our reliability verdict.

Several owners on Hearth.com and The Garage Journal report completing MRCOOL DIY installations themselves.

Theme: Owner installation experience

Several · 4 first-person owner reports across 2 public discussions

A small sample can reveal themes, not failure rates. Thin or single-source themes are omitted rather than filled in.

Decision guide

At a glance

What the published numbers mean before you compare every spec.

Cold-weather output

At 5°F, certified output is 11,700 BTU/h — 65% of its 47°F rating.

ENERGY STAR ↗

DIY status not confirmed

The cited fields do not confirm a pre-charged line set or DIY-line designation for this model.

Electrical details missing

Voltage is not published in the sources we cite, so confirm it before choosing equipment.

Heating efficiency in its size class

HSPF2 9.8 is below the 10.2 average among 125 models in the same rounded capacity class.

ENERGY STAR ↗

Good fit if…

Your room is near 700–1000 sq. ft. under the ENERGY STAR starting-point assumptions, and a load calculation agrees.

Think twice if…

You have not confirmed the voltage, room load, and installation requirements for this exact model.

Room guidance is a screening estimate for standard conditions. Check your room inputs; use Manual J for final sizing.

Certified spec table

Outdoor model numberDIY-18-HP-C-230CSource: ENERGY STAR Mini-Split Heat Pumps dataset ·
Indoor model numberDIY-18-HP-WMAH-230C25Source: ENERGY STAR Mini-Split Heat Pumps dataset ·
AHRI reference number207339188Source: ENERGY STAR Mini-Split Heat Pumps dataset ·
SeriesDIYSource: ENERGY STAR Mini-Split Heat Pumps dataset ·
Heating capacity at 47F18,000 BTU/hSource: ENERGY STAR Mini-Split Heat Pumps dataset ·
Heating capacity at 17F13,800 BTU/hSource: ENERGY STAR Mini-Split Heat Pumps dataset ·
Heating capacity at 5F11,700 BTU/hSource: ENERGY STAR Mini-Split Heat Pumps dataset ·
SEER222.7Source: ENERGY STAR Mini-Split Heat Pumps dataset ·
EER212.6Source: ENERGY STAR Mini-Split Heat Pumps dataset ·
HSPF29.8Source: ENERGY STAR Mini-Split Heat Pumps dataset ·

Values marked ENERGY STAR come from the certification dataset; values marked Manufacturer spec come from the linked product documents.

Specs not published for this model

The sources we cite do not publish these values for this model, so we leave them blank rather than guess.

VoltageMinimum circuit ampacityMaximum breaker / fuseLine set length rangePre-charged line setBrand DIY line

Check the fit for your room

Room-size guidance is a starting point, not a load calculation. Confirm sizing and installation requirements with a qualified contractor.

Check your room size

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