MRCOOL DIY Mini Split Alternative
DIY Mini Split Systems
9,000–36,000 BTU DIY mini splits, single- through 3-zone, in wall mount, ceiling cassette and concealed duct. If you’re shopping for a MRCOOL DIY mini split alternative, these Zone Air systems are built for homeowner installation too, with no EPA certification required. Comparing brands first? See our best DIY mini splits for 2026.
- Pre-charged line sets with quick-connect fittings eliminate brazing copper pipe and pulling a deep vacuum.
- No EPA certification or specialized gauges required, unlike conventional ductless systems installed by trade professionals.
- Ideal for spaces poorly served by central HVAC, such as garages, attics, sunrooms, or older ductless homes.
- Each indoor head operates independently with its own thermostat, enabling true zone-by-zone comfort control.
- Avoids ductwork energy losses, often making a properly sized mini split more efficient than central air.
- Delivers serious comfort upgrades without the cost and overhead of a full contractor installation.
Single Zone DIY Ductless Systems
One indoor head and one outdoor condenser, a ductless mini-split for one room.
Zone Air™ DIY 9,000 BTU 23 SEER2 115V Wall Mount Ductless Mini-Split Heat Pump AC & Heater with Pre-Charged Lineset - Up to 450 Sq Ft
Zone Air™ DIY 12,000 BTU 23 SEER2 115V Wall Mount Ductless Mini-Split Heat Pump AC & Heater with Pre-Charged Lineset - Up to 600 Sq Ft
Zone Air™ DIY 9,000 BTU 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump AC & Heater with Pre-Charged Lineset - Up to 450 Sq Ft
Zone Air™ DIY 12,000 BTU 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump AC & Heater with Pre-Charged Lineset - Up to 600 Sq Ft
Zone Air™ DIY 18,000 BTU 23 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump AC & Heater with Pre-Charged Lineset - Up to 900 Sq Ft
Zone Air™ Airframe 9,500 BTU 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump AC - Up to 475 Sq Ft
Zone Air™ Airframe 12,000 BTU 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump AC - Up to 600 Sq Ft
Zone Air™ Thin-Air 9,500 BTU 19.6 SEER2 230V Concealed Mini-Split Heat Pump AC - Up to 475 Sq Ft
Zone Air™ Thin-Air 11,000 BTU 19 SEER2 230V Concealed Mini-Split Heat Pump AC - Up to 550 Sq Ft
Multi Zone DIY Mini Split Heat Pump Systems
A DIY multi-zone setup runs two or three indoor heads off one outdoor condenser, each room on its own thermostat.
Dual-Zone Systems
Two indoor heads on one outdoor condenser, so both rooms can cool and heat on their own schedules.
Zone Air™ DIY DUAL ZONE 24,000 BTU (12K+12K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,200 Sq Ft
Zone Air™ DIY DUAL ZONE 21,000 BTU (12K+9K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,050 Sq Ft
Zone Air™ DIY DUAL ZONE 30,000 BTU (12K+18K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,500 Sq Ft
Zone Air™ DIY DUAL ZONE 27,000 BTU (9K+18K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,350 Sq Ft
Zone Air™ DIY DUAL ZONE 36,000 BTU (18K+18K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,800 Sq Ft
Zone Air™ DIY DUAL ZONE 18,000 BTU (9K+9K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 900 Sq Ft
Zone Air™ Airframe DUAL ZONE 24,000 BTU (12K+12K) 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System - Up to 1,200 Sq Ft
Zone Air™ Airframe DUAL ZONE 19,000 BTU (9.5K+9.5K) 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System - Up to 950 Sq Ft
Zone Air™ Airframe DUAL ZONE 21,500 BTU (12K+9.5K) 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System - Up to 1,075 Sq Ft
Zone Air™ Thin-Air DUAL ZONE 22,000 BTU (11K+11K) 19 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,100 Sq Ft
Zone Air™ Thin-Air DUAL ZONE 19,000 BTU (9.5K+9.5K) 19 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 950 Sq Ft
Zone Air™ Thin-Air DUAL ZONE 20,500 BTU (11K+9.5K) 19 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,025 Sq Ft
Three-Zone Systems
Three indoor heads on one outdoor condenser for independent comfort in three rooms.
Zone Air™ DIY 3 ZONE 36,000 BTU (12K+12K+12K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,800 Sq Ft
Zone Air™ DIY 3 ZONE 27,000 BTU (9K+9K+9K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,350 Sq Ft
Zone Air™ DIY 3 ZONE 36,000 BTU (9K+9K+18K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,800 Sq Ft
Zone Air™ DIY 3 ZONE 30,000 BTU (9K+9K+12K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,500 Sq Ft
Zone Air™ DIY 3 ZONE 33,000 BTU (9K+12K+12K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System - Up to 1,650 Sq Ft
Zone Air™ Airframe 3 ZONE 36,000 BTU (12K+12K+12K) 24 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System - Up to 1,800 Sq Ft
Zone Air™ Airframe 3 ZONE 28,500 BTU (9.5K+9.5K+9.5K) 24 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System - Up to 1,425 Sq Ft
Zone Air™ Airframe 3 ZONE 31,000 BTU (12K+9.5K+9.5K) 24 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System - Up to 1,550 Sq Ft
Zone Air™ Airframe 3 ZONE 33,500 BTU (12K+12K+9.5K) 24 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System - Up to 1,675 Sq Ft
Zone Air™ Thin-Air 3 ZONE 33,000 BTU (11K+11K+11K) 22 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,650 Sq Ft
Zone Air™ Thin-Air 3 ZONE 28,500 BTU (9.5K+9.5K+9.5K) 22 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,425 Sq Ft
Zone Air™ Thin-Air 3 ZONE 30,000 BTU (11K+9.5K+9.5K) 22 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,500 Sq Ft
Zone Air™ Thin-Air 3 ZONE 31,500 BTU (11K+11K+9.5K) 22 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,575 Sq Ft
MrCool DIY Mini Splits
MRCOOL's DIY systems use pre-charged, quick-connect line sets, so you don't need an EPA license to make the refrigerant connections. Zone Air systems are built on that same idea, with a few differences: line sets can be cut to any length from 5 to 75 feet, and, as of November 2026, Zone Air is the only DIY mini split that lets you mix wall mount, ceiling cassette and concealed ducted indoor units on one outdoor unit. An uninstalled Zone Air system can also be returned within 30 days of delivery, while MRCOOL return terms depend on the seller.
Can I Install a DIY Mini Split Myself?
Yes, in most cases. A DIY mini split ships with the refrigerant already in the system and line sets that connect by hand, so the steps that normally need an HVAC tech (brazing copper, pulling a vacuum, charging refrigerant) are skipped. Your part is mounting the indoor unit, drilling one hole through the wall, setting the outdoor unit, running the line set and condensate drain, and tightening the quick-connect fittings. Most homeowners get the mechanical install done over a weekend.
The electrical hookup is the part to hand off if you aren't comfortable with it. Many areas require a licensed electrician for the circuit and the panel connection. Installing it yourself does not void the Zone Air warranty (5 years on parts, 7 on the compressor).
Best DIY Mini Splits
The best DIY mini split for you is the one sized to the room. For a bedroom or office, a wall mount with 9,000 or 12,000 BTU is usually the right size. The 115V models are the simplest to wire. Bigger living rooms and basements match up better with the system that has 18,000 BTU and runs on 230V. If you are doing two or three rooms, a multi-zone system runs each indoor unit off one outdoor condenser. You get a separate thermostat for each room. Every Zone Air system keeps heating down to -13°F.
Sizing It Right with a BTU Calculator
Before you buy anything, run the numbers. A btu calculator is the single most useful tool in this process, translating square footage, ceiling height, insulation quality, window exposure, and climate zone into a concrete BTU target for each room you intend to condition.
Factors a BTU Calculator Uses to Size Each Room
| Factor | Why It Affects BTU Sizing |
|---|---|
| Square footage | Establishes the baseline room size the system must condition, though it alone isn't enough to determine accurate capacity. |
| Ceiling height | Vaulted or taller ceilings increase the volume of air that needs conditioning, raising the BTU requirement even for rooms with similar floor space. |
| Insulation quality | Affects how well a room retains conditioned air, influencing how much capacity is needed to maintain stable temperatures. |
| Window exposure | A sunny, west-facing room gains significantly more heat than a shaded one, requiring a different BTU allocation even at equal square footage. |
| Climate zone | Determines the broader heating and cooling demands a system must meet, shaping the overall BTU target for each room. |
Shop DIY Mini Splits by Zones
Our 2026 DIY lineup runs from single-zone units at $1,899.99 (9K 115V, good for up to 450 sq ft) up to a dual-zone 24K (12K+12K) rated 24 SEER2 for spaces up to 1,200 sq ft. One indoor head per room equals one zone, so you might want to pick the setup that matches the rooms you’re conditioning.
Single Zone (1 Zone)
One indoor unit, one outdoor condenser. That’s the simplest and cheapest mini split setup, and it can be the right choice for one room or an open space. From $1,899.
Dual Zone (2 Zone)
One outdoor condenser runs two indoor heads, each with its own thermostat. This works well when you’ve got two rooms that run on different schedules. From $3,039.
Multi Zone (2–5 Zone)
How a multi-zone system works, when you’d want one and which of our kits fit a 3+ room project.
Browse DIY Mini Splits by Size and Form Factor
Every DIY mini split we sell is sorted the way people actually shop. That is by how much capacity the room needs, where the indoor head goes, and how many rooms it serves. Every one of them is a cold climate mini split heat pump that’s rated to keep heating at -13°F.
By capacity
- 9,000 BTU DIY mini splitsbedrooms and offices, 200–350 sq ft
- 12,000 BTU DIY mini splitsmaster bedrooms and living rooms, 350–550 sq ft
- 18,000 BTU DIY mini splitsgreat rooms and basements, 600–850 sq ft
By form factor
- Wall mounted mini splitsthe standard head — easiest DIY install
- Ceiling cassette mini splitsflush ceiling mount, four-way airflow
- Concealed ducted mini splitshidden above the ceiling, short duct runs
By number of rooms
- Single zone systemsone room, one condenser
- Dual zone systemstwo rooms on independent thermostats
- 3 zone systemsthree rooms from one outdoor unit
- Multi zone systemshow 2–5 zone builds are sized
- Whole home systemsheating and cooling the entire house, no ductwork
Frequently asked questions
Here are answers to the most common questions about installing a mini split yourself.