MRCOOL DIY 5th Gen 18k: Specs, Price & Heating Rating
The MRCOOL DIY 5th Gen 18k is a 18,000 BTU, 1-zone mini split system from MRCOOL (model DIY-18-HP-WM-230D25-O). Manufacturer-stated coverage: up to 800 sq ft. Verified SEER2: 21.5. Manufacturer heating rating: down to -13F. It is a true-DIY system (factory pre-charged line set) in our classification. Verified price: $2,909 at HVACDirect (checked 2026-11-04).
Computed from our dataset
- 1 system(s) from our verified dataset appear on this page.
- Price range: $2,909 to $2,909 (verified 2026-11-04).
- Cheapest: MRCOOL DIY 5th Gen 18k at $2,909 (HVACDirect).
- Highest SEER2: MRCOOL DIY 5th Gen 18k at 21.5 SEER2.
- Best heating rating: MRCOOL DIY 5th Gen 18k, rated to -13°F.
- True DIY in this list: 1 system(s) with factory pre-charged line sets.
- Against its class (18,000 BTU, 1 zone): class prices run $999.99 to $4,214.25, median $2,909 - this system sits at the median.
- Dataset note: True DIY: 25 ft pre-charged Quick Connect line set included in the price.
| System | Zones | BTU | Coverage | SEER2 | Heats to | Install | Price | |
|---|---|---|---|---|---|---|---|---|
| MRCOOL DIY 5th Gen 18k DIY-18-HP-WM-230D25-O | 1 | 18,000 | up to 800 sq ft | 21.5 | -13°F | True DIY | $2,909 at HVACDirect | Check price at HVACDirect |
Buying notes
- Specs on this page are exactly the verified fields in our dataset; blanks in the table mean the source did not publish a verifiable figure, and the dataset notes say why where we know.