MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v

MODEL: DIY-18-HP-C-230D25-O

Product Description

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:

• MRCOOL® 18K DIY® 5th Gen Mini-Split Condenser 

• 25ft DIYPro™ Communication Cable

• Installation Accessories

• MRCOOL® Warranty Documents

Specifications at a Glance

Attribute	Details
Voltage	208/230V
Phase	1
Cycle	60 Hz
Cooling Capacity	18,000 BTU
Heating Capacity	18,000 BTU
Max Coverage Area	750 sq. ft.
SEER2	22.5
EER2	13.7
HSPF2-4	11.5
HSPF2-5	8.5
Compressor Type	Rotary
Inverter	DC
WiFi Compatible	Yes
App Compatibility	iOS & Android
Voice Control	Alexa & Google Assistant
Corrosion-Resistant	Gold Fin® Coating
Net Dimensions (WxHxD)	35.04" x 26.5" x 13.46"
Net Weight	93.48 lbs
Warranty	Lifetime Limited*, 7-Year Compressor, 5-Year Parts

Room Size & BTU Coverage Guide

Choosing the right BTU (British Thermal Unit) output ensures your space stays consistently comfortable all year round. 

BTU Rating	Ideal Room Size
9,000 BTU	250 – 400 sq. ft.
12,000 BTU	400 – 600 sq. ft.
18,000 BTU	600 – 1,000 sq. ft.
24,000 BTU	1,000 – 1,300 sq. ft.
36,000 BTU	1,300 – 1,800 sq. ft.

Important:

Always consider additional factors such as ceiling height, insulation quality, sun exposure, number of windows, climate, and the number of heat-producing appliances in your space when choosing the right system.

What You Need for a Complete System

To achieve full heating and cooling performance, pair this condenser with:

• MRCOOL® DIY® 5th Gen Air Handler (230V Compatible)

• MRCOOL® Quick Connect® Pre-Charged Line Set (25ft included)

• DIYPro™ Communication Cable (25ft included)

Optional Accessories:

• MRCOOL® Wall Mount Bracket

• Additional Quick Connect® Line Sets

• Coupler Kits for line set extensions

Note: This condenser is compatible exclusively with MRCOOL® DIY® 5th Gen Single-Zone Air Handlers (230V). Not compatible with 3rd or 4th Gen systems.

Installation & Manuals 

Product Brochure

Installation Manual

Remote Control Manual

Warranty Document  

AHRI Certificate 

Energy Certificate

Shipping Policy 

At Cool Heat Direct, we offer free curbside delivery on all MRCOOL product orders via FedEx Ground, FedEx Freight, or trusted carriers depending on order size.

• Deliveries are made to the curbside — please arrange assistance for heavy or large items, as drivers do not carry items indoors or upstairs.

• Tracking details will be sent within 3–5 business days after placing your order.

• Freight shipments are scheduled directly by the carrier using the contact information you provide at checkout.

• Please inspect your shipment upon delivery and report any visible damage on the delivery receipt.

👉 Click here for our full Shipping Policy

Return Policy 

We want you to love your purchase from Cool Heat Direct. If you need to return an item:

• Contact us within 30 days of delivery.

• Items must be unused, uninstalled, and in their original packaging.

• A 35% restocking fee applies to all approved returns.

• Accessories such as line sets, wall mounts, and couplers are non-returnable.

• Return shipping is the customer’s responsibility unless the item is damaged or defective on arrival.

To start a return, please email us at support@coolheatdirect.com with your order number and reason for return.

👉 Click here for our full Returns Policy