Mini Split Accessories: Line Sets, Pumps, Mounts & Remotes

Beyond the indoor and outdoor units, a typical installation needs a refrigerant line set, an indoor mounting bracket rated for the wall and unit weight, an outdoor ground pad or wall bracket, a condensate drain or pump, an electrical disconnect, and the power and communication cabling the manufacturer specifies. Supporting materials such as weatherproof seals for wall penetrations, UV-resistant line covers, proper fasteners, and anti-vibration pads help the installation last. Most kits include the indoor unit, outdoor unit, basic control wiring, and sometimes a short line set, while mounting hardware, electrical disconnects, wall sleeves, drainage accessories, and sealing materials are commonly excluded, so it pays to source them before the install date. Outdoor mounting hardware, ground stands, and wall brackets are the items most often forgotten.

Line sets are sized by the diameter of the liquid line and the suction line, and the sizes must match the connections on your indoor and outdoor units. Liquid lines typically range from 1/4 to 3/8 inch and suction lines from 3/8 to 3/4 inch, and common combinations include 1/4 and 3/8 inch, 1/4 and 1/2 inch, and 3/8 and 5/8 inch. Pre-cut sets run from 15 to 50 feet, the suction line should always be insulated, and the line set must suit the refrigerant your system uses. For instance, the MRCOOL 25 foot 3/8 by 5/8 inch kit is listed for 24K and 36K MRCOOL Olympus and Advantage series systems. Compare sizes and lengths in the mini split line sets collection.

You need one when the indoor unit cannot drain by gravity, which is common in basements, attics, and interior walls where the drain line has to travel upward or a long way. A condensate pump collects the moisture the unit removes from the air in a small reservoir, and a float switch starts the pump once the water reaches a set level. Look for a flow rate that suits your system size, quiet operation, overflow protection, and easy access for cleaning. Clean the reservoir periodically, test the float switch, and check the drain tubing for clogs, and see the mini split condensate pumps collection for options and voltage ranges.

Often yes, but a brand-specific remote is the safest match. Original manufacturer remotes are made for exact compatibility with a series of indoor units, which is why a listing such as the Mitsubishi Electric U01A05426 names the MSZ models it supports. Universal remotes are useful when the original is lost or the model is unknown, and smart Wi-Fi remotes add app and voice assistant control on supported systems. Check your indoor unit's model number against the compatibility list before ordering, and browse mini split remote controls for OEM, universal, and smart options.

Check the air filter regularly and replace or clean it on the schedule in your manual, since a clogged filter reduces airflow and indoor air quality. Replacement filters are model specific; for example, the LG MDJ63604401 lists the LSN240HLV, LSN300HLV, LSN303HLV, LSN360HLV, and LSN363HLV as compatible. For a deeper clean of the indoor coil and blower fan, a dedicated cleaning kit such as the RectorSeal Desolv kit is designed for mini split indoor units. Keeping the condensate drain clear is just as important, because a blocked drain is one of the most common causes of service calls.

Every mini split needs its own dedicated circuit, because shared circuits cause breaker trips, reduced performance, and code problems. Voltage depends on the model: smaller 9K and 12K BTU systems are often 110 to 120 volt, though some are 208/230 volt, and 18K BTU and larger systems generally need 208 to 240 volt service. The nameplate lists the minimum circuit ampacity (MCA), which sets the wire size, and the maximum overcurrent protection (MOP), which is the largest breaker or fuse you may use, so do not size wire from the breaker number alone. An electrical disconnect near the outdoor unit and the communication cable the manufacturer specifies are also part of a code-compliant installation. Electrical work should be done by a qualified professional who follows local code and the manufacturer's instructions.

Covers protect outdoor and indoor units from dust, moisture, and debris, and winter covers help keep ice and snow from building up on a condenser during the off season. Line set covers conceal and shield the piping, drain line, and cables running to the outdoor unit. Choose a cover sized to your unit, and remove it before running the system for cooling or heating, following your manufacturer's guidance. Dimensions are listed on each product page, such as the Trane COV04158 winter cover, which measures about 28 3/4 by 25 1/8 by 23 1/4 inches.

Select in-stock accessories ship the same day when ordered before the cutoff shown on the listing, while some items, such as certain covers, have a longer handling time of a few business days. Check the shipping details on each product page. Some listings are final sale with no returns except for items that arrive damaged or defective, so confirm the model, size, and compatibility before you order. If you are unsure which accessory fits your unit, send us the model number and a specialist will help.