Find Your Perfect MRCOOL® DIY system
Not sure which MRCOOL® system you need? Start here.
Picking the right MRCOOL® DIY system doesn’t have to be complicated.
On this page, we’ll help you:
- Match your room size to the right BTU capacity
- Decide between single-room, multi-room, or whole-home solutions
- Check power requirements and what’s included in the box
Answer a few simple questions as you scroll, and by the end you’ll know exactly which type of MRCOOL® system to buy.
How to Choose in 3 Simple Steps
When in doubt, you can always email us a photo of your space and we'll help you choose: support@coolheatdirect.com
1. Measure your space
Note the approximate square footage of the room(s) you want to cool and heat.
2. Use the BTU chart below
Find the BTU range that matches your space and conditions.
3. Pick your setup
Decide if you need a single-room, multi-room, or whole-home system.
BTU & Room Size Guide
If your space has lots of windows, poor insulation, or extreme heat or cold, choose the next BTU size up.
Approximate Room Size vs Recommended BTU
| Room Size (Approx.) | Recommended BTU Capacity |
|---|---|
| Up to 250 sq. ft | 9,000 BTU |
| 250–400 sq. ft | 12,000 BTU |
| 400–600 sq. ft | 18,000 BTU |
| 600–1,000 sq. ft | 24,000 BTU |
| 1,000–1,500 sq. ft | 30,000 BTU |
| 1,500–2,000 sq. ft | 36,000 BTU |
Tip:
- Hot climates, large windows, or poor insulation? Size up.
- Cool climates, well-insulated space? You may be fine with the lower end of the range.
Choose the Setup That Matches Your Home
Single Room
Bedroom, Office, Garage or Studio
If you’re heating and cooling one main space - bedroom, office, garage, workshop, or studio - a single-zone MRCOOL® DIY system is usually the best fit.
• Ideal for: 1 room or open space
• Clean, wall-mounted indoor unit
• Great for garages, home offices, bonus rooms, garden rooms, and more
Best fit: MRCOOL® DIY single-zone or EasyPro™ DIY systems.
Multiple Rooms
Upstairs, Downstairs or Split Spaces
A multi-zone MRCOOL® DIY system gives you separate indoor units, each with its own remote, all connected to a single condenser outside.
- Ideal for: 2–5 rooms or separate areas
- Individual control in each room
- Cleaner exterior look with one outdoor unit
Best fit: MRCOOL® DIY multi-zone systems.
Home With Ducts
Whole-Home Comfort With Existing Ductwork
If your home already has ductwork and you want to replace or upgrade an older central system, MRCOOL® offers powerful Universal and Central Ducted options.
- Ideal for: whole-home comfort through existing ducts
- Pairs well with existing ductwork and vents
- Designed for serious, all-season performance
Best fit: MRCOOL® Universal or Central Ducted systems.
Power & Voltage: What You Need to Know
Before you finalize your system, it’s important to check your available power where the condenser will be installed.
- Many smaller systems run on 115V, which is common in standard household outlets.
- Larger BTU systems often require 230V and a dedicated breaker.
- Your home’s electrical panel or a licensed electrician can confirm what you have available.
Note: If you’re not sure, don’t guess. Take a clear photo of your electrical panel and send it to support@coolheatdirect.com. We can help you decide which MRCOOL® DIY systems are compatible.
What’s Included & Extras
What’s in a MRCOOL® DIY System – and What You May Need Extra
Included in Your MRCOOL® DIY Kit
- Outdoor condenser unit – pre-charged with refrigerant
- Indoor air handlers – wall-mounted units for each zone
- Pre-charged line sets – quick-connect lines
- Communication cables and control wires
- Basic mounting and installation materials
- Remote controls
Extras for MRCOOL® DIY Systems
- Additional line sets for longer runs for multi-zone setups
- Wall sleeve for the line-set hole
- Line-set cover kit for a cleaner exterior look
- Disconnect box and whip (check local electrical code)
- Condenser wall bracket or pad
Each product page shows what’s included; if you’re unsure about accessories, we can help before you order.
Need help?
Frequently Asked Questions
Common Questions About Choosing a MRCOOL® DIY System
MRCOOL® DIY systems are designed specifically for confident homeowners. The pre-charged, quick-connect line sets mean you don’t have to handle refrigerant. Many installs can be completed over a weekend with basic tools. For any work on your electrical panel, you should use a licensed electrician.
No. MRCOOL® DIY systems are built for homeowner installation and still include full MRCOOL® warranty coverage when installed according to the instructions. Always keep your proof of purchase and documentation.
Start with the BTU & Room Size Guide above. If your space has high ceilings, a lot of glass, poor insulation, or you live in a very hot or very cold climate, it’s usually safer to size up. If you’re still unsure, email us details about your space and we’ll help you decide.
First, refer to the official MRCOOL® install manual and videos linked on each product page. If you’re unsure about electrical work, hire a licensed electrician. If you have questions about choosing or ordering the right system, email us at support@coolheatdirect.com before you buy and we’ll walk you through your options.
With multi-zone systems, you choose your number of zones upfront. If you think you might want extra zones later, look at a system with more capacity than you need right now, or consider a second single-zone system for future expansion.
Ready to Choose Your MRCOOL® DIY System?
For single rooms, multi-zone setups, or full-home upgrades, we’ll make sure you choose the right MRCOOL® system the first time.