FAQ

The MRCOOL DIY single zone units include a lineset in the box already. (25ft for the DIY 5th Gen EStar, and 16ft for the EZPro). You can connect linesets together using a coupler kit, or order an additional lineset with a different length. You can also go up to 66ft or 75ft by using a coupler.

The DIY kit usually comes with the indoor air handler, outdoor condenser,
one pre-charged line set with control wire, remote, wall sleeve, wall
template, communication cable, drain hose, and mounting hardware. The
main tools you’ll need separately are a drill, level, and basic hand tools.

Measure from the outdoor condenser location to the indoor air handler,
following the actual path the line set will run (including bends, not just
straight distance). MRCOOL DIY line sets come in fixed lengths (16’, 25’,
35’, 50’), so round up to the next size and coil any extra neatly. You can also go up to 66ft or 75ft by using a coupler.

Mount the indoor air handler on the provided wall bracket, drill a 3.5" hole
for the lines, run the pre-charged line set, drain, and wire through the hole,
mount the outdoor condenser on a pad or brackets, connect the
quick-connect fittings, plug in the communication wire, and turn on power. You can find tutorials on YouTube that walk you through the entire process.

Yes. In general, use about 20–25 BTUs per square foot of conditioned
space. For example, a 550 sq ft room needs ~12,000 BTUs (1 ton). Ceiling
height, insulation, windows, and climate also matter, so sizing calculators or
a load calculation will be most accurate.

The regular 5th Gen DIY is the standard system and comes with a 5 year parts, 7 year compressor warranty along with a 25ft lineset. The Easy Pro is a more budget-friendly version that comes with a shorter, 16ft lineset along with a 1 year parts, and 2 year compressor warranty, making it better for small, simple installs.

Universal Series:

• Most energy efficient model
• Heats down to -22 degrees F (without the help of an auxiliary heat kit)
• 100% heating output down to -13 degrees F and 100% cooling output up to 110 degrees F
• Works with R454B no-vac precharged line sets
• Can be set up for upflow, downflow, and horizontal flow applications
• Manufactured the longest (thus most proven)
• 10 years parts, 10 years compressor, and 2 years labor warranty
• Slightly smaller air handlers
• Gunmetal gray color condenser and air handler
• Most expensive

Hyper Heat:

• 2nd most energy efficient model
• Heats down to -22 degrees F (without the help of an auxiliary heat kit)
• 100% heating output down to -9 degrees F and 100% cooling output up to 109 degrees F
• Works with R454B no-vac precharged line sets
• Can be set up for upflow, downflow, and horizontal flow applications
• 2nd newest model in MrCool central ducted lineup
• 10 years parts, 10 years compressor, and 10 years labor warranty
• Beige color condenser and gray air handler
• 2nd most expensive

Versa Pro:

• Least energy efficient model
• Heats down to -13 degrees F (without the help of an auxiliary heat kit)
• Works with R454B no-vac precharged line sets
• Can be set up for upflow, downflow, and horizontal flow applications
• Newest model in MrCool central ducted lineup
• 10 years parts, 10 years compressor warranty
• Beige color condenser and gray air handler
• Least expensive

Most installs also need a disconnect box, line set cover kit for a cleaner look, wall mounting bracket or pad for the condenser, and
possibly additional line set extensions if your run is longer than the included length.

You need a 3.5-inch diameter hole. The kit includes a wall sleeve that fits perfectly in this opening to protect the lines and finish the wall penetration.

The 5th Gen DIY has improved efficiency ratings (higher SEER2), quieter
operation, stronger heating capability in cold weather, and updated WiFi/smart controls compared to the 4th Gen. It’s essentially a more refined, higher-performance version. It also uses a new refrigerant R454B compared to the old one, R-410A.

Yes, MRCOOL DIY Multi-Zone systems allow mixing of ceiling cassettes and wall-mounted air handlers on the same outdoor condenser, as long as total capacity does not exceed the unit’s maximum rating. You can build your own system here.

DIY 5th Gen mini splits heat effectively down to -13°F outdoors. They are designed for reliable year-round comfort, even in cold northern climates.

MRCOOL offers a 5-year parts warranty and a 7-year compressor warranty
standard for DIY 5th gen systems. You can register for your warranty here.