Description

The DIYHH-18-HP-C-230D25-O — MRCOOL 18,000 BTU 21.2 SEER2 Heat Pump Condenser – DIYHH-18-HP-C-230D25-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 DIYHH-18-HP-C-230D25-O

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padding: 15px;
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font-weight: 600;
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.specs-table td {
padding: 12px 15px;
border-bottom: 1px solid #e0e0e0;
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border-radius: 15px;
margin: 50px 0;
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color: #D53938;
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margin-bottom: 40px;
font-size: 28px;
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gap: 30px;
max-width: 800px;
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background: white;
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border-radius: 12px;
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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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text-align: center;
margin-bottom: 40px;
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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;
}

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inline style attributes until 2026-08-06 — core/layout.py emits bare
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.warranty-note {
margin-top: 15px;
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color: #666;
font-size: 0.9em;
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.cta-note {
margin-top: 20px;
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background: rgba(213,57,56,0.05);
border: 2px solid #D53938;
border-radius: 12px;
padding: 25px 30px;
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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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margin-bottom: -2px;
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background: #e9ecef;
border-color: #57A9F9;
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display: block;
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@media (max-width: 768px) {
#product-container {
padding: 15px;
}

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

#product-container h2 {
font-size: 1.4em;
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.specs-table {
font-size: 0.9em;
}

.specs-table th,
.specs-table td {
padding: 10px;
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.compliance-badge {
flex-direction: column;
text-align: center;
padding: 20px;
}

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text-align: center;
}

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

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

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border-radius: 8px;
}
}

Where the DIYHH-18-HP-C-230D25-O fits

This is the outdoor condenser by itself. A working system also needs a matching indoor head and line set, so call before ordering if you are not sure of the pairing. At 18,000 BTU it is typically specified for roughly 700 to 1,000 square feet, but insulation, ceiling height and climate all move that figure, so check it against a load calculation. It runs on 230V and needs a dedicated 230V circuit. At 21.2 SEER2 it sits at the efficient end of this size class. 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.

DIYHH-18-HP-C-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 U.S. Department of Energy heat pump guide. 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 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.

DIYHH-18-HP-C-230D25-O FAQ

Does the DIYHH-18-HP-C-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.