MRCOOL® 12k DIY 5th Generation Mini-Split Condenser 115v

MODEL: DIY-12-HP-C-115D25-O

Product Description

Effortless, Energy-Efficient Climate Control for Spaces up to 500 sq. ft.

The MRCOOL® 12K BTU DIY® 5th Generation Mini-Split Condenser brings powerful, reliable heating and cooling to your home — no HVAC pro required. Designed for true DIY installation, this ductless heat pump is perfect for bedrooms, small living areas, home offices, and workshops up to 500 sq. ft.

Thanks to the pre-charged 25-foot Quick Connect® line set with eco-friendly R-454B refrigerant, installation is fast, clean, and vacuum-free. The included DIYPro™ cable offers added protection against weather, wildlife, and yard debris, ensuring lasting durability.

Enjoy seamless control through the SmartHVAC® app, or hands-free convenience with Amazon Alexa and Google Assistant. The Gold Fin® condenser coating protects against corrosion, making this unit an excellent choice for coastal or humid regions.

Built-in features like Auto Mode, Timer Function, and Auto Restart maximize energy savings, while the Anti-Mildew function keeps your air handler clean and healthy. Backed by an industry-leading warranty, you’ll enjoy efficient, year-round comfort with complete peace of mind.

Why You’ll Love It

✅ Ideal for Small to Medium Spaces — Perfect for bedrooms, home offices, and studios up to 500 sq. ft.

✅ True DIY Installation — No vacuum pumps or pro tools needed with the pre-charged Quick Connect® line set and DIYPro™ communication cable

✅ Smart-Home Ready — Control via the SmartHVAC® app, Alexa, and Google Assistant

✅ Gold Fin® Corrosion Protection — Rust-resistant, perfect for coastal climates

✅ Eco-Friendly Refrigerant — Uses R-454B, a greener, more efficient option

✅ Ultra-Quiet Operation — Operates at a whisper-quiet 54 dBA

✅ Industry-Leading Warranty — Limited Lifetime Compressor Warranty (with registration), 7-Year Compressor Warranty, and 5-Year Parts Warranty

What’s Included:

• MRCOOL® 12K DIY® 5th Gen Mini-Split Condenser (115V)

• 25ft DIYPro™ Communication Cable

• Installation Accessories

• MRCOOL® Warranty Documents

Specifications at a Glance

Attribute	Details
Voltage	115V
Phase	1
Cycle	60 Hz
Cooling Capacity	12,000 BTU
Heating Capacity	12,000 BTU
Max Coverage Area	500 sq. ft.
SEER2	23.5
EER2	12.5
HSPF2-4	10.2
HSPF2-5	7.6
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)	30.12" x 21.85" x 11.93"
Net Weight	83.11 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 (115V 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 (115V). 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