Best DIY Mini Split Air Conditioners (2026)

The Albott kit is built around a fast-fit line set and an indoor unit that arrives pre-wired, which cuts the on-site wiring to the power supply and the communication connection. As an inverter heat pump it modulates compressor speed, so you get both cooling and heating. Because it runs on 115V, you avoid the biggest hidden cost of a DIY installation, a new two-pole circuit.

The limit is capacity: 12,000 BTU covers a living room or a bedroom plus an open hall, but it will not carry a whole floor. Next to the MRCOOL DIY Select 18,000 BTU it gives up a third of the capacity in return for simpler electrical work, which for a typical home is the better trade.

In ownership, the quick-connect fittings are sealed once and should not be reopened, so plan the line set route carefully before you cut. The usual chores apply: a monthly filter rinse, a sloped drain, and keeping the outdoor coil clear. If you relocate the unit later, ask the maker whether the fittings can be reused. Before you order, decide where the outdoor unit will sit, since the line set length in the kit limits how far from the indoor head it can go. Many owners underestimate how much a clean, straight wall penetration matters for drain flow and for keeping the refrigerant lines free of kinks.

This is the 220V version of the same Albott DIY platform, with the same fast-fit set and pre-wired indoor unit, and an 18 SEER2 efficiency rating. At 12,000 BTU it has the same capacity as the 115V Albott, so the only practical reason to choose it is that you already have a 220V circuit available, for example from a retired dryer or welder outlet.

Compared with the 115V model, the 220V draws about half the current for the same load, which allows a smaller breaker and thinner supply wire in some installs. That helps only when the run from the panel is long. If you have to pull a new two-pole circuit just for this unit, the 115V version is the cheaper project.

Ownership is the same as the 115V sibling. Keep the filters clean, the drain sloped and the outdoor coil clear, and mount the outdoor unit on a pad or a bracket that is level so the compressor oil returns properly.

The ROVSUN is the smallest and least expensive system here, a 9,000 BTU inverter heat pump with a 20 SEER2 rating and Wi-Fi control. The listing sells it on its quiet 28 dB mute mode and wide setpoint range, which suit a bedroom or a small office.

Be clear about what the listing does not promise. Unlike the Albott and MRCOOL kits, the data I have does not describe it as a pre-charged quick-connect system, so confirm the installation method before you count on a no-vacuum install. I include it for its value and because its line set options are common, but it is the one pick that may still need a technician.

At 9,000 BTU it is the right size for roughly 350 to 450 square feet. In a larger room it will run flat out and still miss the setpoint. Maintenance is the standard monthly filter rinse and a clear outdoor coil.

MRCOOL's DIY Select line includes a pre-charged quick-connect line set, so the listing states you need no vacuum pump, gauges, brazing or refrigerant handling. The 18,000 BTU model is rated up to 800 square feet on 230V, with 17.3 SEER2 cooling efficiency and 8.5 HSPF2 heating efficiency.

The HSPF2 figure is useful, since it tells you how efficiently the unit heats over a season, and the 8.5 here is solid for a DIY-class system. Its cooling efficiency is lower than the 20 SEER2 ROVSUN, but that is the cost of a bigger compressor with a longer proven record. The 230V supply means a dedicated breaker, so you should include the electrical work in your budget.

In ownership terms, MRCOOL is a long-established DIY brand and parts and phone support are easier to reach than from the smallest sellers. The outdoor unit is heavier, so use a proper pad or heavy-duty bracket and keep the line set run within the length allowed for the factory charge. Because the wiring is on a larger circuit than the small units, hire a licensed electrician for the breaker and disconnect even if you handle every other step yourself, and keep the permit paperwork if your town requires it.

The 24,000 BTU DIY Select steps up to a two-ton system rated for up to 1,050 square feet, with 16.5 SEER2 cooling efficiency and 8.3 HSPF2 heating efficiency. It keeps the pre-charged quick-connect line set that defines the DIY Select line, so the refrigerant side still needs no pump or gauges.

Efficiency slides as capacity rises, so this is less efficient than the 18,000 BTU sibling at 17.3 SEER2 and 8.5 HSPF2. You are paying for coverage, not for efficiency. One indoor head can only move so much air, so a single-wall unit serves an open floor well and closed bedrooms poorly.

The install demands heft: a bigger outdoor unit, thicker line set and a larger breaker. Plan the lift and the pad, and have a helper for mounting the outdoor unit. Maintenance mirrors the smaller units. Check the doorway and stair clearances before delivery, since the outdoor unit for a two-ton system is bulky enough that one person will struggle to carry it alone.