Description
DIY 5th Gen Indoor Air Handler
This DIY 5th Gen wall mount air handler delivers precise, zone-by-zone climate control. Designed for use with a compatible multi-zone or single-zone condenser, it provides whisper-quiet operation, built-in Wi-Fi, and MRCOOL's Quick Connect technology for simplified installation. Note: This is the indoor air handler unit only. A compatible condenser is required for a complete system.
Technical Specifications
| Model / SKU | DIY-12-HP-WM-115D25-O |
| Brand | MRCOOL |
| Series | DIY 5th Gen |
| Refrigerant | R-454B |
| Electrical | 115V / 60Hz |
| Weight | 108.0 lbs (48.99 kg) |
| Product Type | Air Handler ONLY |
| AHRI Certified | Yes — AHRI certification number available upon request |
Installation & Product Tips
- Mounting Height: Install the air handler 7–8 feet above the floor for optimal airflow distribution. Avoid mounting directly above doors or windows.
- Line Set Routing: Plan your line set route before mounting. The line set must slope slightly toward the outdoor unit for proper condensate drainage.
- Electrical Requirements: This air handler requires a dedicated circuit. Consult a licensed electrician if you are unsure of your home's electrical capacity.
- Wi-Fi Setup: The built-in Wi-Fi module connects to 2.4 GHz networks only. Have your network password ready during setup.
- Filter Maintenance: Clean or replace the air filter every 4–6 weeks during heavy use to maintain efficiency and air quality.
Frequently Asked Questions
Compatible Accessories
| Accessory | Price | Action |
|---|---|---|
| DIY Quick-Connect Line Sets Pre-charged R-454B, 16 ft / 25 ft / 35 ft / 50 ft — select size matching your air handler BTU |
From $227 | View All Options |
| LineGuard Line Set Cover Kit (4.5" — 16 Piece) Protect and conceal exposed line sets. SKU: MLG450 |
$68.07 | View & Add to Cart |
| Condenser Wall Mounting Bracket (9K–18K BTU) Heavy-duty steel, adjustable. SKU: MB176 |
$31.60 | View & Add to Cart |
| Condenser Rubber Risers — 6" (Set of 2) Vibration isolation, drainage elevation. SKU: H600-B |
$59.00 | View & Add to Cart |
| MRCOOL Smart Wi-Fi Mini Stat (White) 24V smart thermostat, Alexa & Google compatible. SKU: MST05 |
$85.50 | View & Add to Cart |
| MRCOOL Mini-Split Care Kit Complete maintenance kit for annual cleaning. SKU: MMCK01 |
$45.28 | View & Add to Cart |
Warranty Information
MRCOOL Limited Warranty (when registered within 30 days of installation):
- Compressor: 7 years
- Parts: 5 years
- Labor: 1 year (through authorized service dealer)
Without registration: 5-year compressor / 1-year parts
Register at mrcool.com/warranty-registration. Keep your purchase receipt and installation records. Warranty is void if unit is installed improperly, modified, or used with non-approved refrigerants.
Need Help Choosing the Right Product?
Our HVAC specialists are ready to help you select the right system for your application, verify compatibility, and answer any technical questions.
Contact UsWith over 15 years in the HVAC industry and 500+ MRCOOL systems personally installed, we bring hands-on expertise that translates directly into accurate product guidance. You get the right system the first time — backed by our price match guarantee and free expert support.
