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Replacement parts and filters

MRCOOL DIY 5th Gen Multi-Zone Replacement Parts & Filters

Covers 5 DIY 5th Gen Multi-Zone 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.

CapacityModelSKU pairDocumented part numbers
3-zone / BTU not publishedMRCOOL DIY 5th Gen Multi-Zone 18k 3-Zone Outdoor UnitDIY-MULTI3-18HP230D-O
  • quick connect line set: DIY25-1438-O
  • smart thermostat: MST05
4-zone / BTU not publishedMRCOOL DIY 5th Gen Multi-Zone 27k 4-Zone Outdoor UnitDIY-MULTI4-27HP230D-O
  • quick connect line set: DIY25-1438-O
  • quick connect line set: DIY25-3858-O
  • smart thermostat: MST05
5-zone / BTU not publishedMRCOOL DIY 5th Gen Multi-Zone 36k 5-Zone Outdoor UnitDIY-MULTI5-36HP230D-O
  • quick connect line set: DIY25-1412-O
  • quick connect line set: DIY25-1438-O
  • quick connect line set: DIY25-3858-O
  • smart thermostat: MST05
6-zone / BTU not publishedMRCOOL DIY 5th Gen Multi-Zone 48k 6-Zone Outdoor UnitDIY-MULTI6-48HP230D-O
  • quick connect line set: DIY25-1412-O
  • quick connect line set: DIY25-1438-O
  • quick connect line set: DIY25-3858-O
  • smart thermostat: MST05
6-zone / BTU not publishedMRCOOL DIY 5th Gen Multi-Zone 55k 6-Zone Outdoor UnitDIY-MULTI6-55HP230D-O
  • quick connect line set: DIY25-1412-O
  • quick connect line set: DIY25-1438-O
  • quick connect line set: DIY25-3858-O
  • smart thermostat: MST05

Parts & filters

quick-connect-line-set

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

Fits
MRCOOL DIY 5th Gen Multi-Zone systems
OEM part number
DIY25-1412-O
Fit note
Applies to 3 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 Gen Multi-Zone systems
OEM part number
DIY25-1438-O
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 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 Gen Multi-Zone systems
OEM part number
DIY25-3858-O
Fit note
Applies to 4 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)

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price at HVACDirect

smart-thermostat

MRCOOL Smart Wi-Fi Mini Stat

Fits
MRCOOL DIY 5th Gen Multi-Zone 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 Gen Multi-Zone filter?
MRCOOL 5th Gen R-454B DIY Line Set 1/4 - 1/2 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: DIY25-1412-O.
Is the MRCOOL DIY 5th Gen Multi-Zone 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.