What's in the box
- MRCOOL® 18K DIY® 5th Gen Mini-Split Condenser
- 25ft DIYPro™ Communication Cable
- Installation Accessories
- MRCOOL® Warranty Documents
Free curbside shipping on eligible MRCOOL® systems across the continental U.S. Most products ship in 3–5 business days and arrive in 4–10 days, depending on your location. Freight carriers will call to schedule delivery.
Returns accepted within 30 days on new, unopened items in original packaging. A restocking fee of up to 35% may apply for HVAC equipment — we’ll always confirm before issuing a return authorization.
Each MRCOOL® system is backed by manufacturer warranty coverage as defined by product and model — typically 5–10 years on major components. Register your system after installation to activate full coverage.
Need help with sizing, voltage or compatibility? Email support@coolheatdirect.com — our U.S. team replies within one business day.
MODEL: DIY-18-HP-C-230D25-O
High-Performance, DIY-Friendly Comfort for Spaces up to 750 sq. ft.
The MRCOOL® 18K BTU DIY® 5th Generation Mini-Split Condenser is the perfect solution for those who want powerful, energy-efficient heating and cooling without the hassle of hiring an HVAC technician. Designed for simple, true DIY installation, this unit is ideal for larger bedrooms, living rooms, home gyms, workshops, or offices up to 750 sq. ft.
Thanks to the pre-charged 25-foot Quick Connect® line set with eco-friendly R-454B refrigerant, installation is fast, clean, and requires no vacuum pump or special tools. The DIYPro™ communication cable replaces traditional electrical conduit for enhanced outdoor durability against weather, pets, and yard tools.
Enjoy full climate control via the SmartHVAC® app, or hands-free voice commands with Amazon Alexa and Google Assistant. The Gold Fin® condenser coating defends against corrosion, making it a perfect choice for coastal and humid environments.
Additional features like Auto Mode, Timer Function, Auto Restart, and Anti-Mildew Protection ensure your home stays effortlessly comfortable and your air handler remains clean. Backed by one of the best warranties in the industry, this condenser delivers years of reliable performance.
Why You’ll Love It
✅ Perfect for Larger Spaces — Ideal for bedrooms, home gyms, and living areas up to 750 sq. ft.
✅ Easy DIY Installation — Pre-charged Quick Connect® line set and DIYPro™ cable simplify setup with no pro tools required
✅ Smart-Home Compatible — Control with the SmartHVAC® app, Amazon Alexa, or Google Assistant
✅ Gold Fin® Anti-Corrosion Coating — Ideal for coastal and humid climates
✅ Ultra-Quiet Operation — Whisper-quiet 58.5 dBA performance
✅ Eco-Friendly Refrigerant — Uses efficient, environmentally safer R-454B
✅ Industry-Leading Warranty — Limited Lifetime Compressor Warranty (with registration), 7-Year Compressor Warranty, 5-Year Parts Warranty
What’s Included:
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MRCOOL® 18K DIY® 5th Gen Mini-Split Condenser
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25ft DIYPro™ Communication Cable
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Installation Accessories
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MRCOOL® Warranty Documents
Questions, answered
Everything homeowners ask before buying a MRCOOL® system.
Installation
Do I need an HVAC technician to install this?
No. MRCOOL® DIY systems are designed for homeowner installation. The pre-charged Quick Connect® line set means there's no refrigerant handling, no vacuum pump, and no special tools or license required.
How long does installation take?
Most single-zone systems go in within a few hours: mount the indoor air handler, set the outdoor condenser, connect the pre-charged line set, and power it on.
Do I need an electrician?
The system needs a dedicated circuit. Most homeowners have a licensed electrician add the breaker and disconnect — everything else you can do yourself.
Sizing & compatibility
What BTU size do I need?
As a rule of thumb: up to 400 sq ft → 9–12K BTU, 400–600 sq ft → 12–18K, 600–1,000 sq ft → 18–24K. Use the room-size guide above and factor in insulation, ceiling height and sun exposure.
Will it heat in winter?
Yes — these are heat pumps, so they heat and cool. Many MRCOOL® systems keep heating in sub-freezing temperatures; check each model's spec sheet for its low-temperature heating range.
115V or 230V — which do I need?
9K–12K units are usually 115V (standard outlet circuit); 18K and larger are typically 230V. The voltage is shown in the product options and specifications.
Warranty & support
What warranty is included?
MRCOOL® systems carry manufacturer warranty coverage — typically 5–10 years on major components when you register your system after installation.
How do I get help choosing or installing?
Email support@coolheatdirect.com — our U.S. team replies within one business day with sizing, voltage and compatibility help.
Shipping & returns
How fast does it ship?
Most products ship in 3–5 business days with free curbside delivery in the continental U.S. The freight carrier calls to schedule your delivery.
Can I return it?
Returns are accepted within 30 days on new, unopened items in original packaging. A restocking fee may apply to HVAC equipment — we always confirm before issuing a return authorization.
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