How often should I clean the MRCOOL DIY 5th Generation filter?

MRCOOL DIY 5th Gen Service Manual does not publish a calendar interval for this line in the sourced maintenance section. It identifies dirty filter maintenance as a condition to address, so treat visible dirt, weak airflow, or reduced cooling/heating as the manual-backed trigger. The source note is: Dirty air filter ... Clean or replace.

Is the MRCOOL DIY 5th Generation filter washable or disposable?

The sourced rows are treated as washable air-filter entries unless the capacity table shows a specific OEM disposable-filter part number for that model.

Replacement parts and filters

MRCOOL DIY 5th Gen Replacement Parts & Filters

Covers 5 DIY 5th Generation systems. Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

View Fitment

Capacity and SKU fitment

Use the exact indoor and outdoor model pair before ordering; shared parts and capacity-specific parts are separated by row.

Capacity	Model	SKU pair	Documented part numbers
9k BTU	MRCOOL DIY 5th Gen 9,000 BTU (115V)	DIY-09-HP-WMAH-115D25-O / DIY-09-HP-C-115D25-O	display board: Display board (service part) filter washable: Washable air filter indoor pcb: Indoor control board / PCB (service part) louver motor: Louver stepping motor (service part) quick connect line set: DIY25-1438-O remote control: Remote control smart thermostat: MST05
12k BTU	MRCOOL DIY 5th Gen 12,000 BTU (115V)	DIY-12-HP-WMAH-115D25-O / DIY-12-HP-C-115D25-O	display board: Display board (service part) filter washable: Washable air filter indoor pcb: Indoor control board / PCB (service part) louver motor: Louver stepping motor (service part) quick connect line set: DIY25-1438-O remote control: Remote control smart thermostat: MST05
18k BTU	MRCOOL DIY 5th Gen 18,000 BTU (230V)	DIY-18-HP-WMAH-230D25-O / DIY-18-HP-C-230D25-O	display board: Display board (service part) filter washable: Washable air filter indoor pcb: Indoor control board / PCB (service part) louver motor: Louver stepping motor (service part) quick connect line set: DIY25-1412-O remote control: Remote control smart thermostat: MST05
23k BTU	MRCOOL DIY 5th Gen 24k marketed / 23,000 BTU rated (230V)	DIY-24-HP-WMAH-230D25-O / DIY-24-HP-C-230D25-O	display board: Display board (service part) filter washable: Washable air filter indoor pcb: Indoor control board / PCB (service part) louver motor: Louver stepping motor (service part) quick connect line set: DIY25-3858-O remote control: Remote control smart thermostat: MST05
36k BTU	MRCOOL DIY 5th Gen 36,000 BTU (230V)	DIY-36-HP-WMAH-230D25-O / DIY-36-HP-C-230D25-O	display board: Display board (service part) filter washable: Washable air filter indoor pcb: Indoor control board / PCB (service part) louver motor: Louver stepping motor (service part) quick connect line set: DIY25-3858-O remote control: Remote control smart thermostat: MST05

Parts & filters

display-board

Display board (service part)

Fits: MRCOOL DIY 5th Generation systems
Fit note: Applies to all 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL DIY 5th Gen Service Manual, 4.2 Error Display (Indoor Unit), page p. 36 (If the unit responds, the display board requires replacement.)

filter-washable

Washable air filter

Fits: MRCOOL DIY 5th Generation systems
Fit note: Applies to all 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL DIY 5th Gen Service Manual, 4.5 Error Diagnosis Without Error Code - Remote Maintenance, page p. 46 (Dirty air filter ... Clean or replace)

indoor-pcb

Indoor control board / PCB (service part)

Fits: MRCOOL DIY 5th Generation systems
Fit note: Applies to all 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL DIY 5th Gen Service Manual, 4.2 Error Display (Indoor Unit), page p. 36 (If the unit does not respond to the remote, the indoor PCB requires replacement.)

louver-motor

Louver stepping motor (service part)

Fits: MRCOOL DIY 5th Generation systems
Fit note: Applies to all 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL DIY 5th Gen Service Manual, 4.5 Field Maintenance, page p. 50 (Replace the stepping motor)

quick-connect-line-set

25 ft Quick Connect precharged line set - 1/4 x 1/2

Fits: MRCOOL DIY 5th Generation systems
OEM part number: DIY25-1412-O
Fit note: Applies to 1 of 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL 5th Gen R-454B DIY Line Set 1/4 - 1/2, DIY 5th Gen 9k, 12k & 18k, page article (DIY25-1412-O)

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quick-connect-line-set

25 ft Quick Connect precharged line set - 1/4 x 3/8

Fits: MRCOOL DIY 5th Generation systems
OEM part number: DIY25-1438-O
Fit note: Applies to 2 of 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL 5th Gen R-454B DIY Line Set 1/4 - 3/8, DIY 5th Gen 6k, 9k & 12k, page article (DIY25-1438-O)

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quick-connect-line-set

25 ft Quick Connect precharged line set - 3/8 x 5/8

Fits: MRCOOL DIY 5th Generation systems
OEM part number: DIY25-3858-O
Fit note: Applies to 2 of 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL 5th Gen R-454 DIY Line Set 3/8 - 5/8, DIY 5th Gen 24k & 36k, page article (DIY25-3858-O)

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remote-control

Remote control

Fits: MRCOOL DIY 5th Generation systems
Fit note: Applies to all 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL DIY 5th Gen Service Manual, 4.5 Remote Maintenance, page p. 46 (Replace the remote control)

smart-thermostat

MRCOOL Smart Wi-Fi Mini Stat

Fits: MRCOOL DIY 5th Generation systems
OEM part number: MST05
Fit note: Applies to all 5 covered systems in this line; confirm the exact indoor/outdoor SKU in the capacity table before ordering.
Source: MRCOOL Mini-Stats, MRCOOL Mini Stats, page article (MST05)

Frequently asked questions

How often should I clean the MRCOOL DIY 5th Generation filter?: MRCOOL DIY 5th Gen Service Manual does not publish a calendar interval for this line in the sourced maintenance section. It identifies dirty filter maintenance as a condition to address, so treat visible dirt, weak airflow, or reduced cooling/heating as the manual-backed trigger. The source note is: Dirty air filter ... Clean or replace.
Is the MRCOOL DIY 5th Generation filter washable or disposable?: The sourced rows are treated as washable air-filter entries unless the capacity table shows a specific OEM disposable-filter part number for that model.