Estimated Delivery Timeline
What size do I need?
Slide to the size of the room you want to heat and cool.
Multiple rooms? Size each room separately and see our multi-zone systems.
BTU coverage chart
MRCOOL's general sizing guide for wall-mounted units.
| Unit size | Room size (approx.) |
|---|---|
| 6,000 BTU (6K) | up to 200 sq ft |
| 9,000 BTU (9K) | up to 400 sq ft |
| 12,000 BTU (12K) | up to 550 sq ft |
| 18,000 BTU (18K) | up to 800 sq ft |
| 24,000 BTU (24K) | up to 1,050 sq ft |
| 36,000 BTU (36K) | up to 1,550 sq ft |
Based on 8 ft ceilings and ideal conditions. Insulation, windows, ceiling height and climate change what you need. MRCOOL recommends a professional load calculation for best results.
Can I install it myself? Yes, mostly.
MRCOOL built the DIY series for homeowners. Five of the six steps are DIY; the electrical hookup should follow your local code. Always follow the MRCOOL installation manual for your model.
- Pick the spots DIYChoose an inside wall for the air handler and a level outdoor spot for the condenser within reach of the line set.
- Mount the wall bracket DIYLevel and screw the mounting plate to the wall studs.
- Drill the line set hole DIYDrill one hole through the wall, sloped slightly down to the outside for the condensate drain.
- Hang the indoor unit DIYFeed the line set, cable and drain through the wall and hook the air handler onto the bracket.
- Set the condenser and Quick Connect® DIYPlace the outdoor unit on a pad or wall bracket and hand-tighten the pre-charged line set. No vacuum pump, gauges or refrigerant handling.
- Power it up ElectricianRun the circuit to the disconnect. Many areas require a licensed electrician for this step. Then turn it on and control it by remote or app.
Questions before you buy? Call a real rep at +1 (888) 308-5580, 7 AM–7 PM CT, 7 days a week.
Find the mini split size you need
Answer a few questions and we'll recommend a complete MRCOOL DIY system from our store, with the current listed price.
How many rooms do you want to heat and cool?
One outdoor unit can run up to five indoor units, so each room gets its own temperature.
How big is each room?
Enter the approximate square footage. You can measure length × width, or estimate.
Adjust for ceiling, sunlight and room type
These are the same fine-tunes used on leading MRCOOL dealer sites. Leave them at the defaults if you are not sure.
See the BTU coverage guide
From MRCOOL's sizing guide for wall-mounted units with 8 ft ceilings. Insulation, windows and climate can change what you need.
A few details so we recommend the right system
Climate, power and how you want the indoor unit mounted.
Winters where you live
Available electrical service
Indoor unit style
Your recommended system
Black Friday
Sign up and get 15% off your chosen model
We’ll email you a discount code to use at checkout on this system. The offer ends December 1.
Want a specialist to double-check sizing, line-set length or a multi-zone combination? Call or email us. No obligation.
Mon–Sun, 7:00 AM–7:00 PM Central
This is an estimate based on MRCOOL's published sizing guide for wall-mounted units (8 ft ceilings), adjusted for the ceiling height, sunlight and room type you entered. Insulation, windows, appliances and climate can change what you need, and MRCOOL recommends a professional load calculation for best results. Prices shown are the current prices listed on this site. Shipping is calculated at checkout.
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Key Information
- Order Cutoff Time: 2:00 PM EST
- Order Handling Time: 1–3 business days (Monday–Friday)
- Transit Time: 1–7 business days (Monday–Friday)
- Total Estimated Delivery Time: 3–11 business days (Monday–Friday)
- Shipping Availability: Free Shipping On some Items In The Contiguous United States only
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Why buy from Iron Line Tools
MRCOOL DIY questions, answered
Can I really install an MRCOOL DIY mini-split myself?
What size mini-split do I need?
Do I need 115V or 230V?
Single zone or multi-zone?
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