A Buyer’s Guide to the 18k, 24k, and 36k BTU Systems
If you’re considering a for your home, you’re already ahead of the curve. These ductless HVAC units are designed for homeowners who want professional-grade climate control—without the professional price tag or installation headaches.
But with multiple BTU options available, how do you choose the right one for your space?
Let’s break down the differences between the 18k, 24k, and 36k BTU systems so you can make an informed decision.
🧊 MRCOOL 18k DIY 5th Gen – Best for Medium Rooms
Coverage: 500–750 sq. ft. Ideal For: Bedrooms, garages, small offices SEER2: 22.5 Why Choose It:
- High efficiency for moderate spaces
- Whisper-quiet operation
- Perfect balance of power and affordability
- Easy DIY install with 25ft QuickConnect® line set 👉
❄️ MRCOOL 24k DIY 5th Gen – Best for Large Rooms
Coverage: 750–1,000 sq. ft. Ideal For: Living rooms, bonus rooms, finished attics SEER2: 22.7 Why Choose It:
- More cooling power for larger areas
- Same DIY-friendly setup
- SmartHVAC app + voice control
- Energy Star certified for lower bills 👉
🌬️ MRCOOL 36k DIY 5th Gen – Best for XL Spaces
Coverage: 1,000–1,500 sq. ft. Ideal For: Open-plan layouts, basements, workshops SEER2: 18.0 Why Choose It:
- Maximum capacity for expansive zones
- Handles extreme temperatures with ease
- Lifetime compressor warranty
- Still DIY—no HVAC license required 👉
📊 Quick Comparison Table
| Feature | |||
|---|---|---|---|
| Coverage Area | 500–750 sq. ft. | 750–1,000 sq. ft. | 1,000–1,500 sq. ft. |
| Voltage | 230V | 230V | 230V |
| SEER2 Rating | 22.5 | 22.7 | 18.0 |
| Refrigerant | R-454B | R-454B | R-454B |
| Smart Control | ✅ | ✅ | ✅ |
| DIY Installation | ✅ | ✅ | ✅ |
| Energy Star Certified | ✅ | ✅ | ✅ |
🧠 Final Thoughts
Choosing the right MRCOOL system comes down to room size, efficiency goals, and budget. All three models offer:
- Tool-free installation
- Smart climate control
- Eco-friendly refrigerant
- Industry-leading warranties
So whether you’re cooling a cozy bedroom or a sprawling basement, MRCOOL has a DIY solution that fits.
👉 Ready to upgrade your comfort? Browse our full and find the perfect fit for your space.
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