# MRCOOL DIY 5th Gen 18,000 BTU wall mount system

> MRCOOL DIY 5th Gen 18,000 BTU wall mount system (DIY-18-HP-WM-230D25-O) is a 18,000 BTU system from MRCOOL DIY 5th Gen. It has a wall mount indoor unit, runs on 208/230V, is rated 22.5 SEER2, has an HSPF2 of 11.5, puts out 12,800 BTU/h of heat at 5 °F, heats down to -13 °F by the brand's rating, uses R-454B refrigerant, comes with a 25 ft line set, and carries a 7-year compressor warranty. Lowest in-stock price on file: $2,909 at HVACDirect (checked Oct 14, 2026).

- Line: [MRCOOL DIY 5th Gen](https://minisplitfacts.com/lines/mrcool-diy-5th-gen/)
- Category: [Single-zone systems](https://minisplitfacts.com/compare/single-zone/)
- Size tier within its line: 18k
- Status: current
- Data confidence: confirmed (last verified 2026-10-14; [what this means](https://minisplitfacts.com/how-we-compare/#confidence))
- Page: https://minisplitfacts.com/products/mrcool-diy-5th-gen-18k-wall/

## Specifications

| Spec | Value | Source |
|---|---|---|
| Model number | DIY-18-HP-WM-230D25-O | [hvacdirect.com](https://hvacdirect.com/mrcool-diy-5th-gen-e-star-18000-btu-single-zone-mini-split-complete-system-with-25ft-line-set-230v-diy-18-hp-wm-230d25-o.html) (retailer, page, 2026-10-14) |
| Size | 18,000 BTU/h | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Indoor unit style | Wall mount | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Voltage | 208/230V | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Outdoor unit model | DIY-18-HP-C-230D25-O | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Indoor unit model | DIY-18-HP-WMAH-230D25-O | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| SEER2 (cooling efficiency) | 22.5 | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| EER2 (efficiency at 95 °F) | 13.7 | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| HSPF2 (heating efficiency) | 11.5 | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| Rated cooling capacity | 18,000 BTU/h | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| Heating capacity at 47 °F | 18,000 BTU/h | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| Heating capacity at 17 °F | 13,400 BTU/h | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| Heating capacity at 5 °F | 12,800 BTU/h | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| COP at 5 °F | 2.44 | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| Heats down to | -13 °F | [mrcool.com](https://www.mrcool.com/product/diy-5th-generation) (brand, page, 2026-10-14) |
| Refrigerant | R-454B | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| ENERGY STAR certified | yes | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| ENERGY STAR cold climate | yes | [energystar.gov](https://www.energystar.gov/productfinder/product/certified-heat-pumps/details/3798935) (certification, feed, 2026-10-14) |
| Line connection | Quick-connect | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Line set included | 25 ft | [hvacdirect.com](https://hvacdirect.com/mrcool-diy-5th-gen-e-star-18000-btu-single-zone-mini-split-complete-system-with-25ft-line-set-230v-diy-18-hp-wm-230d25-o.html) (retailer, page, 2026-10-14) |
| Wi-Fi control | not published |  |
| Indoor sound level (quietest) | 19 dB(A) | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Outdoor sound level | 58.5 dB(A) | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Room size (brand's claim) | 800 sq ft | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Compressor warranty | 7 years | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-diy-5-wr-en-01.pdf) (brand, pdf, 2026-10-14) |
| Parts warranty | 5 years | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-diy-5-wr-en-01.pdf) (brand, pdf, 2026-10-14) |
| Warranty if you install it yourself | Kept | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-diy-5-wr-en-01.pdf) (brand, pdf, 2026-10-14) |
| Outdoor unit size (W×D×H) | 35.04 × 13.46 × 26.5 in | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Indoor unit size (W×D×H) | 42.52 × 8.9 × 13.19 in | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |
| Outdoor unit weight | 93.48 lb | [doxrepo.mrcool.com](https://doxrepo.mrcool.com/mc-cat-en-01.pdf) (brand, pdf, 2026-10-14) |

## Where to buy

| Store | Price (USD) | Availability | Checked | Link |
|---|---|---|---|---|
| HVACDirect | $2,909 | in stock | 2026-10-14 | [View at HVACDirect](https://hvacdirect.com/mrcool-diy-5th-gen-e-star-18000-btu-single-zone-mini-split-complete-system-with-25ft-line-set-230v-diy-18-hp-wm-230d25-o.html) |
| Amazon | see Amazon | unknown | — | [Buy at Amazon](https://www.amazon.com/dp/B0DYKBX8Y1?tag=minisplitfacts-20) |

Prices are re-checked weekly; a date more than a month old means the store could not be re-read.

_MiniSplit Facts earns a commission on some purchases made through links on this page. It costs you nothing, and it never changes what we list or how we rank it. As an Amazon Associate, MiniSplit Facts earns from qualifying purchases._

## The equivalent in other lines

Same category, same size tier (18k), different line:

- [ACiQ Extreme 18,000 BTU ceiling cassette system](https://minisplitfacts.com/products/aciq-extreme-18k-cassette/) — $2,249.99
- [ACiQ Extreme 18,000 BTU slim ceiling cassette system](https://minisplitfacts.com/products/aciq-extreme-18k-cassette-slim/) — $2,429.99
- [ACiQ Extreme 18,000 BTU floor console system](https://minisplitfacts.com/products/aciq-extreme-18k-console/) — $2,393.99
- [ACiQ Extreme 18,000 BTU concealed duct system](https://minisplitfacts.com/products/aciq-extreme-18k-duct/) — $2,349.99
- [ACiQ Extreme 18,000 BTU wall mount system](https://minisplitfacts.com/products/aciq-extreme-18k-wall/) — $1,899.99
- [ACiQ Standard 18,000 BTU ceiling cassette system](https://minisplitfacts.com/products/aciq-standard-18k-cassette/) — $1,944.99
- [ACiQ Standard 18,000 BTU slim ceiling cassette system](https://minisplitfacts.com/products/aciq-standard-18k-cassette-slim/) — $2,124.99
- [ACiQ Standard 18,000 BTU floor console system](https://minisplitfacts.com/products/aciq-standard-18k-console/) — $2,088.99


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MiniSplit Facts lists modular tool storage from every brand side by side, with a source for every spec. [How we compare](https://minisplitfacts.com/how-we-compare/). Data as of 2026-10-14.