Description

The O-12-HP-WMAH-230C-O — MRCOOL 12,000 BTU Wall Mount Air Handler – O-12-HP-WMAH-230C-O — is stocked and shipped by Buy Comfort Direct from Winder, Georgia. Specifications, fitment notes and ordering details are below; call (877) 843-4822 if you need it matched to your equipment first.

About the O-12-HP-WMAH-230C-O

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font-weight: 600;
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padding: 12px 15px;
border-bottom: 1px solid #e0e0e0;
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margin: 50px 0;
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margin-bottom: 40px;
font-size: 28px;
}

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grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 30px;
max-width: 800px;
margin: 0 auto;
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.warranty-card {
background: white;
padding: 30px;
border-radius: 12px;
text-align: center;
border: 2px solid rgba(213,57,56,0.3);
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border-color: #D53938;
transform: translateY(-5px);
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.warranty-years {
font-size: 48px;
font-weight: 700;
color: #D53938;
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.warranty-label {
color: #333;
font-size: 14px;
font-weight: 600;
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.cta-section {
background: linear-gradient(135deg, #F8F9FA 0%, #e9ecef 100%);
padding: 60px 30px;
border-radius: 15px;
margin-top: 50px;
box-shadow: 0 10px 40px rgba(0,0,0,0.2);
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.cta-content {
text-align: center;
margin-bottom: 40px;
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.cta-section h2 {
color: #D53938;
margin: 0 0 15px 0;
font-size: 28px;
font-weight: 700;
}

.cta-section p {
color: #333;
margin: 0;
font-size: 16px;
max-width: 700px;
margin-left: auto;
margin-right: auto;
line-height: 1.6;
}

/* Small print under a warranty grid and under the CTA. Both were written as
inline style attributes until 2026-08-06 — core/layout.py emits bare
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.warranty-note {
margin-top: 15px;
text-align: center;
color: #666;
font-size: 0.9em;
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.cta-note {
margin-top: 20px;
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.compliance-badge {
background: rgba(213,57,56,0.05);
border: 2px solid #D53938;
border-radius: 12px;
padding: 25px 30px;
display: flex;
align-items: center;
gap: 20px;
max-width: 700px;
margin: 0 auto;
transition: all 0.3s ease;
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.compliance-badge:hover {
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cursor: pointer;
font-size: 1em;
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color: #333;
transition: all 0.3s ease;
margin-right: 5px;
margin-bottom: -2px;
position: relative;
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.tab-label:hover {
background: #e9ecef;
border-color: #57A9F9;
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.tab-radio:checked + .tab-label {
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color: white;
border-color: #D53938;
border-bottom-color: #D53938;
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display: block;
}

@media (max-width: 768px) {
#product-container {
padding: 15px;
}

#product-container h1 {
font-size: 1.8em;
}

#product-container h2 {
font-size: 1.4em;
}

.specs-table {
font-size: 0.9em;
}

.specs-table th,
.specs-table td {
padding: 10px;
}

.compliance-badge {
flex-direction: column;
text-align: center;
padding: 20px;
}

.badge-content {
text-align: center;
}

.cta-section {
padding: 40px 20px;
}

.tab-label {
display: block;
width: 100%;
margin-right: 0;
margin-bottom: 5px;
border-radius: 8px;
}

.tab-panels {
border-radius: 8px;
}
}

Where the O-12-HP-WMAH-230C-O fits

This is the indoor unit by itself — a wall-mount head. It pairs with a matching MRCOOL outdoor condenser. It is rated at 12,000 BTU. This line is meant for professional installation, with evacuation and charging done by a licensed technician.

See the rest of the range in MRCOOL mini splits, or run the numbers with our HVAC sizing tool. Not sure what pairs with what? Call (877) 843-4822 and we will check it before you buy.

O-12-HP-WMAH-230C-O: fitment and resources

Equipment ratings are only valid as an AHRI-matched pairing; confirm the match before ordering. Our free HVAC system sizing tool gives a starting point for tonnage, and Background reading: the AHRI Directory of Certified Product Performance. Browse the rest of our Mini Splits or the MRCOOL catalog, and see what customers say on our reviews page.

Ordering and delivery

In-stock items ship from our Winder, Georgia warehouse; orders over $99 ship free. Large equipment travels by freight carrier and parts by ground, with tracking by email. Financing is available at checkout through Affirm, and contractors can set up a contractor account for trade pricing. Questions before you pay? Use the contact page or call (877) 843-4822.

O-12-HP-WMAH-230C-O FAQ

Does the O-12-HP-WMAH-230C-O ship free?

Yes on orders over $99 — most orders that include it qualify.

How do I know it fits my system?

Send us your equipment model number through the contact page or call (877) 843-4822 and we will confirm the match before it ships.