Description

The DIY-18-HP-WMAH-230D25-O — MRCOOL 18,000 BTU Wall Mount Air Handler – DIY-18-HP-WMAH-230D25-O — is stocked and shipped by Buy Comfort Direct. Specifications, fitment notes and ordering details are below; call (877) 843-4822 if you need it matched to your equipment first.

About the DIY-18-HP-WMAH-230D25-O

* {
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.specs-table thead {
background: linear-gradient(135deg, #D53938 0%, #b32d2c 100%);
color: white;
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.specs-table th {
padding: 15px;
text-align: left;
font-weight: 600;
font-size: 1.1em;
}

.specs-table td {
padding: 12px 15px;
border-bottom: 1px solid #e0e0e0;
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background: #fff;
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background: linear-gradient(135deg, #F8F9FA 0%, #e9ecef 100%);
padding: 50px 30px;
border-radius: 15px;
margin: 50px 0;
}

.warranty-section h2 {
color: #D53938;
text-align: center;
margin-bottom: 40px;
font-size: 28px;
}

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display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 30px;
max-width: 800px;
margin: 0 auto;
}

.warranty-card {
background: white;
padding: 30px;
border-radius: 12px;
text-align: center;
border: 2px solid rgba(213,57,56,0.3);
transition: all 0.3s ease;
}

.warranty-card:hover {
background: rgba(213,57,56,0.05);
border-color: #D53938;
transform: translateY(-5px);
}

.warranty-years {
font-size: 48px;
font-weight: 700;
color: #D53938;
}

.warranty-label {
color: #333;
font-size: 14px;
font-weight: 600;
}

.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);
}

.cta-content {
text-align: center;
margin-bottom: 40px;
}

.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
classes now, so the whole document’s styling lives in this block.
See LAYOUT_CONTRACT.md (“Brand theme”). */
.warranty-note {
margin-top: 15px;
text-align: center;
color: #666;
font-size: 0.9em;
}

.cta-note {
margin-top: 20px;
text-align: center;
color: #666;
font-size: 0.9em;
}

.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;
}

.compliance-badge:hover {
background: rgba(87,169,249,0.05);
transform: translateY(-2px);
box-shadow: 0 8px 20px rgba(213,57,56,0.2);
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.badge-icon {
font-size: 32px;
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font-weight: 700;
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margin: 30px 0;
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border: 2px solid #ddd;
border-radius: 8px 8px 0 0;
cursor: pointer;
font-size: 1em;
font-weight: 600;
color: #333;
transition: all 0.3s ease;
margin-right: 5px;
margin-bottom: -2px;
position: relative;
}

.tab-label:hover {
background: #e9ecef;
border-color: #57A9F9;
}

.tab-radio:checked + .tab-label {
background: linear-gradient(135deg, #D53938 0%, #b32d2c 100%);
color: white;
border-color: #D53938;
border-bottom-color: #D53938;
z-index: 2;
}

.tab-panels {
border: 2px solid #ddd;
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display: none;
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.tab-radio:nth-of-type(4):checked ~ .tab-panels .tab-panel:nth-of-type(4),
.tab-radio:nth-of-type(5):checked ~ .tab-panels .tab-panel:nth-of-type(5) {
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 DIY-18-HP-WMAH-230D25-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 18,000 BTU. The DIY line ships with pre-charged Quick Connect line sets — no vacuum pump, no refrigerant handling, no EPA 608 certification. Installing it yourself still keeps the 7-year compressor and 5-year parts coverage.

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.

DIY-18-HP-WMAH-230D25-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 DIY 5th Gen Single Zone or the MRCOOL catalog, and see what customers say on our reviews page.

Ordering and delivery

In-stock items ship fast; 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.

DIY-18-HP-WMAH-230D25-O FAQ

Does the DIY-18-HP-WMAH-230D25-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.