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Questions about sizing, an order or a return? Call, email or send the form. We respond to all email inquiries within 24 business hours.
FrosthubUSA is now Cool Mini Splits. Same company, old name.
MRCOOL DIY Single Zone
Shop all single zone →1How big is the room? One system cools and heats one room
9K BTU 115V150–350 sq ft
Bedroom or officefrom$1,24912K BTU 115V351–500 sq ft
Large bedroomfrom$1,39918K BTU 230V501–750 sq ft
Living roomfrom$1,69024K BTU 230V751–1,000 sq ft
Garage or shopfrom$1,89936K BTU 230V1,001–1,500 sq ft
Open spacefrom$3,769
Bedroom or officefrom$1,24912K BTU 115V351–500 sq ft
Large bedroomfrom$1,39918K BTU 230V501–750 sq ft
Living roomfrom$1,69024K BTU 230V751–1,000 sq ft
Garage or shopfrom$1,89936K BTU 230V1,001–1,500 sq ft
Open spacefrom$3,769
2Or pick a line Same install, more features as you go up
Everything ships in one box
- Pre-charged line set, no vacuum pump
- 9K and 12K run on 115V
- Free shipping on kept orders, 48 states
Not sure? Call +1 (844) 999-9725
Every single zone system is complete: indoor unit, outdoor unit and a sealed line set in the box.
Compare the three lines
MRCOOL DIY 5th Gen Multi-Zone
Shop all 385 systems →1How many rooms? Each room gets its own indoor unit and temperature
2Or pick the outdoor unit Bigger unit, more rooms and more space
How a multi-zone system connects
- 1outdoor unit outside the house
- +1indoor unit in each room
- +1pre-charged line set per room
Every system includes a 16 ft line set for each room. Longer runs cost more.
Line set sizes
Three MRCOOL DIY lines, same easy install
Full comparison chart →Lowest price
DIY Selectfrom$1,249Efficiency17.5 SEER2Compressor2 yrLine set11.5 ft9K12K18K24K36K
DIY EasyProfrom$1,487Efficiency20.2 SEER2Compressor5 yr +Line set11.5 ft9K12K18K24K36K
DIY 5th Genfrom$2,329Efficiency23.6 SEER2Compressor7 yr +Line set25 ft9K12K18K24K36K
DIY Selectfrom$1,249Efficiency17.5 SEER2Compressor2 yrLine set11.5 ft9K12K18K24K36K- Heats down to −13°F
- Lifetime compressor option
- Multi-zone, 2 to 6 rooms
DIY EasyProfrom$1,487Efficiency20.2 SEER2Compressor5 yr +Line set11.5 ft9K12K18K24K36K- Heats down to −13°F
- Lifetime compressor option
- Multi-zone, 2 to 6 rooms
DIY 5th Genfrom$2,329Efficiency23.6 SEER2Compressor7 yr +Line set25 ft9K12K18K24K36K- Heats down to −13°F
- Lifetime compressor option
- Multi-zone, 2 to 6 rooms
All three install the same way: pre-charged Quick Connect lines, no HVAC tech.
Compare every spec
Install accessories
Pre-charged line sets16, 25, 35 and 50 ft, quick connect
Line set coverHide the run along the wall
Wall bracketMount the outdoor unit off the ground
Outdoor padA level base for the condenser
Disconnect switch60A non-fused, at the outdoor unit
Electrical whipDisconnect to condenser wiring
Coupler kitJoin two line sets for a longer run
MiniStat thermostatWall control and phone app for the mini split
Which line set fits?
Each indoor air handler needs its own line set, sized by BTU.
| Indoor unit | 16 ft | 25 ft | 35 ft | 50 ft |
|---|---|---|---|---|
| 6K, 9K, 12K1/4 × 3/8 | $227 | $264 | $502 | $587 |
| 18K1/4 × 1/2 | $239 | $272 | $510 | $599 |
| 24K, 36K3/8 × 5/8 | $271 | $457 | $565 | $662 |
View all accessories
Need more than 50 ft? Join a 50 ft line set with a 16 ft or 25 ft one using a coupler kit, for 66 ft or up to 75 ft max.
How can we help?
FAQ →
Size my systemBTU by square footage, room by room
Manuals and specsInstall manuals, spec sheets, brochures
Shipping and deliveryFree on kept orders, 48 states
Returns and refundsHow a return works, step by step
Before you buy
Manuals and documents
Install manualsSingle zoneMulti-zone
MRCOOL warranty (PDF)DIY SelectDIY EasyProDIY 5th Gen single & multi-zone
Orders and policies
Authorized MRCOOL dealer. Full manufacturer warranty on every system.
About us
Single Zone
Multi-Zone
DIY Lines
Accessories
Real people. Honest advice.
+1 (844) 999-9725
Mon–Fri, 9 AM–5 PM EST · Free shipping, 48 states