MRCOOL DIY 24,000 BTU mini split review
Pre-charged quick connect line sets, and the part of the job that is still an electrician's.
A 2 ton inverter heat pump supplied with pre-charged 25 foot quick connect line sets, so the refrigerant circuit never has to be opened.
Check price on AmazonSpecifications
| Spec | Detail |
|---|---|
| Capacity | 24,000 BTU, 2 ton |
| Coverage | Up to 1,050 square feet |
| Supply | 230V |
| Type | Ductless inverter heat pump, heating and cooling |
| Line set | Pre-charged 25 ft quick connect, no special tools, equipment or training required |
| Control | Smart HVAC controller module compatible with Google Assistant and Amazon Alexa |
| Generation | 5th Gen DIY |
Specifications above come from MRCOOL's published feature list. Treat pricing as approximate, since Amazon pricing moves.
What it does well
- The quick connect line set is genuinely the differentiator. The refrigerant circuit arrives sealed and charged, so there is no evacuation, no charging and no certification requirement to make the connection.
- One person with a hammer drill, a level and a helper for the outdoor unit can complete the mechanical installation in a day, which is what turns a $6,000 project into a $3,000 one.
- It is an inverter heat pump, so it modulates rather than cycling, which is why a mini split is quiet and holds temperature where a window unit does not.
- 24,000 BTU covering up to 1,050 square feet is the right size for a two or three car garage shop, which is the most common workshop conditioning problem there is.
- Smart controller with Alexa and Google Assistant support, which matters more than it sounds for a shop you want warm before you walk into it.
Where it falls short
- DIY refers to the refrigerant work, not the electrical work. A 230V circuit sized to the condenser's nameplate is a licensed electrician's job, and in most jurisdictions it is permitted and inspected. The quick connect line set does not change that at all.
- Pre-charged line sets come in fixed lengths. You cannot cut them to fit, and running a longer distance means buying a longer line set, not improvising.
- Efficiency per dollar is not MRCOOL's strength. Conventional systems at similar capacity often carry higher SEER2 ratings, and you are paying a premium for the installation method.
- The quick connect fittings are the one part of the system that must be made up correctly, torqued to specification and leak checked. Rushing that step is how a DIY install becomes a system that loses charge over a season.
- It conditions air. It does not filter welding fume, extract wood dust or ventilate solvent vapour, and a sealed, conditioned shop makes all three of those problems worse rather than better.
What owners report
Owner reports on the MRCOOL DIY line are unusually consistent on one point: people who followed the instructions carefully report successful installs, and people who improvised report leaks. The quick connect fitting is the whole design, and it is also the one step with no margin for approximation. The most repeated piece of owner advice is to mount the outdoor unit properly, keep the line set gently routed rather than kinked, and torque the connections to the specified figure.
The second theme is sizing. Owners who guessed at capacity report short cycling and poor dehumidification in summer. Run the numbers through the mini split sizing calculator rather than picking a round number, and remember that oversizing a mini split is a genuine mistake and not a safety margin. Check the panel with the electrical load calculator before you order, because the answer decides whether you are adding a circuit or a subpanel.
The third theme is what people expected the unit to do for a workshop. It heats and cools quietly and it does nothing about air quality. A conditioned shop with the doors shut concentrates whatever you generate in it, so wood dust extraction and welding fume extraction remain separate problems. Our mini split versus space heater comparison covers whether the spend is justified for your usage pattern in the first place.
Who it suits
- Garage and shop owners conditioning one space up to about 1,050 square feet.
- Competent DIYers who can drill a wall, mount a bracket and torque a fitting, and who will hire an electrician for the circuit.
- Anyone who has been quoted more for installation than the equipment costs.
Who should skip it
- People hiring an HVAC contractor anyway, who can get more efficiency per dollar from a conventional system.
- Buyers who need several independently controlled zones from one condenser.
- Anyone who cannot route a fixed-length line set along the path they need.
Alternatives worth considering
The same DIY design at 1.5 tons and, critically, on 115V. For a shop where getting 230V to the wall is the obstacle, this removes it entirely. Less capacity, so size the space honestly before choosing it.
Check price on AmazonA multi-zone condenser in the same DIY family, for a shop plus an office or a second room that needs its own thermostat. Indoor heads are bought to suit, so total cost rises, but each zone runs independently.
Check price on AmazonThree tons for roughly the same money, if you are hiring an installer. It is a conventional system, so it needs evacuation and charging by a certified technician, and in exchange you get 50 percent more capacity for the same outlay.
Check price on AmazonCommon questions
Can I really install a MRCOOL DIY mini split myself?
The refrigerant side, yes. That is what the pre-charged quick connect line set is for, and it is why this system does not require EPA Section 608 certification the way a conventional split does. The electrical side is not DIY: a 230V circuit sized to the nameplate is a licensed electrician's job and permitted work in most jurisdictions. Budget for the electrician even though you are skipping the HVAC contractor.
What size mini split do I need for a two car garage?
A 24,000 BTU unit covers up to about 1,050 square feet according to MRCOOL, which suits most two and three car garages, but insulation, ceiling height and climate move that a long way. Run your actual numbers through the mini split sizing calculator. Oversizing causes short cycling and poor humidity control, so bigger is not safer.
Is a DIY mini split as efficient as a professionally installed one?
Usually slightly less, for two reasons: the pre-charged line set is a fixed length rather than optimised for the run, and conventional equipment at the same capacity often carries a higher SEER2 rating. You are trading some efficiency for a much lower installed cost. Whether that is a good trade depends on how many hours a year it runs, which the electricity cost calculator will tell you.
MRCOOL DIY or a gas garage heater?
A mini split heats and cools, runs on electricity and needs no flue. A gas unit heater heats only, costs less to buy, and needs venting, a gas line and a licensed gas fitter, with carbon monoxide as the risk you are managing. Our propane versus electric garage heater comparison covers the running costs, and the Modine Hot Dawg review covers the gas option in detail.
Do the quick connect fittings leak over time?
They are the one step in the install with no tolerance for approximation. Owner reports of charge loss almost always trace back to fittings that were not torqued to specification or line sets that were kinked during routing. Follow MRCOOL's torque figures, support the line set properly, and leak check before you close anything up.
Keep reading
- Mini split vs space heater compared
- Propane vs electric garage heater compared
- Mini split sizing calculator
- Shop electrical load calculator
- Cooper and Hunter 48,000 BTU 4-zone review
- Modine Hot Dawg 125,000 BTU heater review
- Honda EU7000iS inverter generator review
This review draws on published specifications, manufacturer figures and the consensus of verified owner reviews. We have not tested this product ourselves, and we say so rather than implying otherwise. As an Amazon Associate we earn from qualifying purchases.