MRCOOL · Single-Zone DIY
DIY-24-HP-WM-230C25
~$2,500approximate retailer price at last check, equipment only
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Discontinued. MRCOOL replaced it with the MRCOOL DIY 5th Gen 24,000 BTU. Leftover stock still turns up; the specs below are for this model.
Best forA 900-1,100 sq ft shop, open-plan main floor, or small whole-home retrofit with a 230V circuit available.
The 2-ton is what people buy for a 1,000 sq ft shop, big open living area, or whole small home, and Home Depot reviewers repeatedly say some version of 'saved $3,000 doing it myself.' It delivers 23k BTU cooling / 25k heating with 20.5 SEER2 — a step down in efficiency from the 12k/18k but still Energy Star. Owner sentiment is the same trade as the rest of the line: install day goes shockingly well, and the risk shows up in years 2-4 as board or sensor failures for an unlucky minority. At this size the DIY premium gets real — you're paying roughly $800-1,000 over an equivalent pro-install unit — but a single pro install quote usually exceeds that gap. Watch freight shipping: the most common negative reviews are dented condensers and cracked air handler mounts on delivery, so photograph the pallet before signing. HD has run it near $2,900 while Ingram's sells it around $2,500, so shop around.
At 5°F it still makes 63% of its rated heat, according to the certified NEEP listing for this pairing. MRCOOL rates it to keep running down to -13°F.
Pairing: DIY-24-HP-C-230C25 with DIY-24-HP-WMAH-230C25. From NEEP's ccASHP list; a different head or condenser posts different numbers.
Covers the MRCOOL DIY (4th and 5th Gen) line as a whole, summarised from 75 owner discussion threads, with the replies on the 12 most-discussed.
Owners who have lived with MRCOOL DIY systems mostly talk about them as the cheap, do-it-yourself way to get a heat pump into a garage, shed, outbuilding or a few rooms. Several owners describe the install as easy: one dual-zone 18k owner put the cost at about a third of a comparable installed Mitsubishi, another says it saved them $9,200 in labor, and an owner who has installed about five in a garage and individual rooms says they have been working well so far and is considering another. A common attitude is that if the unit dies in seven years they will buy another and still be ahead. A 5th Gen 18k owner running it alongside an oil boiler ran the numbers through a fuel-cost calculator and concluded the heat pump is cheaper than oil at their prices. Most of the specific multi-zone ownership stories come from 4th Gen systems (27k and 36k outdoor units with 9k to 24k heads).
The problems owners bring back are leaks and multi-zone quirks. One 27k multi-zone owner had a good first six months, then heads freezing over, eventually weekly, which turned out to be a refrigerant leak; another had a leaking low-pressure switch that led to a compressor warranty swap and left them unsure how to reconnect the sealed line set without letting air in. On a two-zone system, an idle head and its attic line set sweated and dripped into the house while the other zone ran, and heads piped through an attic need a condensate pump that one owner could not find listed for the small 9k wall unit. In the cold, a 24k garage owner who calls the install poorly done says it does not come close to its published efficiency, a reply says it works only a little below zero, and another points out the ductless DIY line is not a hyper-heat unit. The newer DIY Easy Pro on R-454B needs a 7.3 ft minimum room height, and MRCOOL told one buyer not to go below it in a 7 ft basement.
By the evidence, it suits handy owners conditioning a garage, shop, outbuilding or a few rooms who value the precharged quick-connect line sets over a long service life. Owners who have installed both kinds say a standard flare-and-vacuum mini-split is only a little more work and more flexible, and a couple would skip the quick-connect next time. Expect that local techs may not want to touch it.
It depends entirely on the floor plan. For an open 900-1,100 sq ft shop or open-plan main floor, one 2-ton head is simpler — one condenser, one circuit, one install. But a single head can't push air around walls, so a divided floor plan will end up with hot and cold rooms; that's when a multi-zone or two singles makes more sense despite the extra cost.
The quick-connect process is the same no-vacuum job as the 12k, but the physical reality is different: the condenser weighs 130+ lb and the air handler is 41 inches wide, so plan on a second person and check your wall stud layout before the box arrives. Home Depot reviewers who did it themselves repeatedly cite saving around $3,000 versus pro quotes, which typically run $5,500+ at this capacity.
Freight delivery damage — it's the top issue in the 200+ Home Depot reviews. These ship LTL freight, so inspect the condenser and air handler carefully before signing the delivery receipt; a signed clean receipt makes damage claims much harder.
Somewhat. At 20.5 SEER2 it noticeably trails the 12k (22.5) and 18k (22.7), though it still carries Energy Star certification and a solid 9.2 HSPF2 for heating. If your climate is cooling-dominated and bills matter, factor the difference in; if you need 2 tons on one circuit, it's still the efficient way to get there.
It delivers around 25k BTU of heating and is rated down to -13°F, which is real whole-space heating for a shop or small home in most climates. The Gold Fin condenser coating also helps it survive humid and coastal environments where cheaper coils corrode.
MRCOOL · Single-Zone DIY
~$2,609
A 500-700 sq ft master suite, basement, or small apartment in a cold climate where the unit will carry real winter heating.
MRCOOL · Single-Zone DIY
~$2,370
A 350-500 sq ft bedroom, office, or garage where only a 115V circuit is practical and you want the DIY install.
DiscontinuedMRCOOL · Single-Zone DIY
~$2,200
A master suite, large basement, or small apartment where 12k won't keep up but a multi-zone is overkill.