MRCOOL DIY 5th Gen Hyper Heat 18,000 BTU wall mount system
MRCOOL DIY 5th Gen · Single-zone systems · 18,000 BTU
$3,173 at HVACDirect · checked Oct 14, 2026
MRCOOL DIY 5th Gen Hyper Heat 18,000 BTU wall mount system (DIYHH-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 21.2 SEER2, has an HSPF2 of 11, puts out 18,000 BTU/h of heat at 5 °F, heats down to -22 °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: $3,173 at HVACDirect (checked Oct 14, 2026).
| Category | Single-zone systems |
|---|---|
| Model number | DIYHH-18-HP-WM-230D25-Ohvacdirect.com |
| Size ? | 18,000 BTU/hdoxrepo.mrcool.com |
| Indoor unit style ? | Wall mountdoxrepo.mrcool.com |
| Voltage ? | 208/230Vdoxrepo.mrcool.com |
| Outdoor unit model | DIYHH-18-HP-C-230D25-Odoxrepo.mrcool.com |
| Indoor unit model | DIY-18-HP-WMAH-230D25-Odoxrepo.mrcool.com |
| SEER2 (cooling efficiency) ? | 21.2energystar.gov |
| EER2 (efficiency at 95 °F) ? | 12.5energystar.gov |
| HSPF2 (heating efficiency) ? | 11energystar.gov |
| Rated cooling capacity ? | 18,000 BTU/henergystar.gov |
| Heating capacity at 47 °F ? | 18,000 BTU/henergystar.gov |
| Heating capacity at 17 °F ? | 15,200 BTU/henergystar.gov |
| Heating capacity at 5 °F ? | 18,000 BTU/henergystar.gov |
| COP at 5 °F ? | 1.99energystar.gov |
| Heats down to ? | -22 °Fmrcool.com |
| Refrigerant ? | R-454Benergystar.gov |
| ENERGY STAR certified ? | yesenergystar.gov |
| ENERGY STAR cold climate ? | yesenergystar.gov |
| Line connection ? | Quick-connectdoxrepo.mrcool.com |
| Line set included | 25 fthvacdirect.com |
| Wi-Fi control | — |
| Indoor sound level (quietest) | 20.5 dB(A)doxrepo.mrcool.com |
| Outdoor sound level | 58 dB(A)doxrepo.mrcool.com |
| Room size (brand's claim) | 800 sq ftdoxrepo.mrcool.com |
| Compressor warranty ? | 7 yearsdoxrepo.mrcool.com |
| Parts warranty ? | 5 yearsdoxrepo.mrcool.com |
| Warranty if you install it yourself ? | Keptdoxrepo.mrcool.com |
| Outdoor unit size (W×D×H) | 35.04 × 13.46 × 26.5 indoxrepo.mrcool.com |
| Indoor unit size (W×D×H) | 42.52 × 8.9 × 13.19 indoxrepo.mrcool.com |
| Outdoor unit weight | 99.87 lbdoxrepo.mrcool.com |
| Sold as | Single product |
| Availability | Sold by several retailers |
Warranty, and installing it yourself
Self-installing keeps the warranty, by MRCOOL's own terms.
"This warranty applies only to systems that are installed according to the installation instructions, and in accordance with all applicable local, state or province, and federal laws and regulations including but not limited to electrical codes and permits."
From doxrepo.mrcool.com ↗, read 2026-10-14. Terms change, and local law can require a licensed technician for refrigerant or electrical work whatever the warranty says.
- 7 years on the compressor
- 5 years on parts
"The unit comes standard with a 5 year parts and 7 year compressor warranty."
From doxrepo.mrcool.com ↗, read 2026-10-14.
Who makes it
inferred Most likely made by Midea. Its ENERGY STAR certification lists exactly the same figures (capacity at 47, 17 and 5 °F, SEER2, EER2, HSPF2, COP and refrigerant) as a model Midea certifies under its own name. the Midea record ↗
ENERGY STAR record 3798940 (MRCOOL DIYHH-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O) has the same cooling and heating capacities, SEER2, EER2, HSPF2, COP at 5 °F and refrigerant as record 3723116 (MDV MOX430-18HFPN10-M1X + MSAB3E-18HRFPN10-M1), which GD MIDEA AIR-CONDITIONING EQUIPMENT CO., LTD. certifies itself. 2 records from other certifiers share the set.
Where to buy
Prices are re-checked every week. A date more than a month old means the store could not be re-read, so the price may have moved.
Price history
Price tracking for this product began October 14, 2026. Prices are re-checked every week, and the chart fills in from the next check.
Every recorded price change (1)
A row is recorded only when a store's price or stock changes; each line then runs to the date the store was last checked. Amazon prices aren't shown (store policy).
Where this came from
confirmed The part number and every spec shown were read from the brand's or a store's own material: a product page, a spec sheet or a product feed, or an archived copy of one. Last verified 2026-10-14. What the labels mean.
The equivalent in other lines
Same category, same size (18k), wall mount, 208/230V, from other lines; cheapest first, at most two per line. Open any of them side by side with this system, or tick several to compare up to four.
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