MRCOOL Olympus 4th Gen Mini Split - 4-Zone 36,000 BTU Air Conditioner and Heat Pump Condenser with 12K + 12K + 9K + 9K Ceiling Concealed Ducted Air Handlers

MRCOOLSKU: OY4-4ZD-36HP-9K9K12K12K
47 reviews

Price:
Sale price$5,465.00 Regular price$7,000.00SAVE 21%
! Choose Line Set Lengths0 of 4
Each air handler connects to the condenser with its own refrigerant line set. Pick a length for all 4 zones.
Zone 1 · 12K Air Handler
Zone 2 · 12K Air Handler
Zone 3 · 9K Air Handler
Zone 4 · 9K Air Handler
This package includes — tap a piece for full details
Low Stock
Estimated delivery: Sep 7th-16th
Free Curbside Delivery — carrier calls to schedule

Free Curbside Delivery

Included on every order
Ships free by freight carrier. Your order leaves the warehouse tracked, on a palletized freight truck.
The carrier calls ahead. You'll schedule a delivery window that works for you before the truck heads out.
Delivered to the curb. The item is placed at the end of your driveway. Moving it inside is your responsibility, so plan to have help on hand for heavy pieces.
Before you sign: inspect the packaging for damage. Signing the delivery receipt confirms it arrived in good condition.
In-Home Protection Plan
Home Outlet Direct + CPS

Add an Extended Protection Plan by CPS and Enjoy Peace of Mind!

Protection Plan Benefits:
  • Covers 100% parts and labor for product defects in materials and workmanship
  • Replacement of product if it cannot be repaired
  • No deductibles
  • Protection from dust, heat and internal humidity damage
  • Damage caused by power surges
  • In-home service
Full Coverage Details
No deductibles
International coverage
Easy claims process

What's in this package

Every piece below is included in your system price — matched to optimize efficiency, power and compatibility. Tap a piece to see its full description, specs and manuals.

Piece 1 of 3 — MINI SPLIT CONDENSER
Low Stock · SKU MULTI5-36HP230C-O

The MRCOOL® Olympus 36,000 BTU multi-zone heat pump condenser is a high-capacity, heat pump condenser built to power up to five indoor units simultaneously. Designed for homeowners who want efficient and individualized temperature control across multiple rooms, this ductless system delivers tailored comfort to every zone—making it an excellent fit for modern, multi-room living spaces.

Featuring cutting-edge inverter technology, the system provides exceptional energy performance, with SEER2 ratings up to 24 and HSPF2-4 up to 9.5. It operates reliably even in extreme outdoor conditions, functioning in temperatures as low as 5°F to keep your home comfortable year-round. Compatibility with a variety of MRCOOL indoor units—including wall-mounted, ceiling cassette, and concealed duct options—means it’s easy to customize the setup to suit your home’s layout and aesthetic. Smart control options enhance everyday convenience, offering seamless operation through the MRCOOL SmartHVAC app, included remote control, or voice commands via Amazon Alexa and Google Assistant.

Additional features like sleep mode, auto restart, and built-in refrigerant leak detection further improve safety, energy efficiency, and peace of mind. Backed by a 7-year limited warranty on the compressor and a 5-year parts warranty (when installed by a professional), the MRCOOL® Olympus MULTI5-36HP230C-O is a reliable, energy-efficient choice for those looking to achieve flexible, zone-specific heating and cooling throughout their home.

Features

Installation by a licensed professional required where applicable 7-Year Compresser, 5-Year Parts warranty when registered and installed by a licensed professional R-454B environmentally friendly friendly refrigerant Energy Star Certified

Works With

  • O-09-HP-WMAH-230C-O
  • DUCT-09HP-230B-O
  • CASSETTE09HP-230C-O
  • O-12-HP-WMAH-230C-O
  • DUCT-12HP-230B-O
  • CASSETTE12HP-230C-O
  • O-18-HP-WMAH-230C-O
  • DUCT-18-HP-230B-O
  • CASSETTE18HP-230C-O
  • O-24-HP-WMAH-230C-O
  • DUCT-24HP-230B-O
  • CASSETTE24HP-230C-O

MRCOOL Mini Split BTU Guide

Drawn to scale — 1 square = 2 × 2 ft
36K BTU
24K BTU
18K BTU
12K BTU
9K BTU
6K BTU
6K BTU up to 250 sq ft · Small bedroom, office
9K BTU up to 375 sq ft · Bedroom, home office
12K BTU up to 500 sq ft · Large bedroom, den
18K BTU up to 750 sq ft · Living room, master suite
24K BTU up to 1000 sq ft · Open living area
36K BTU up to 1500 sq ft · Great room, small home
Between sizes? Round up. A slightly larger unit runs efficiently at partial load — an undersized one runs constantly.
Shipping
  • Free Shipping on all orders.
  • Large Appliances: Ship via Curbside Delivery — the carrier delivers to your property but not inside your home.
  • Small Items: Ship via standard ground delivery (FedEx or similar), such as small appliances, range hoods, sinks, faucets, and accessories.
Full shipping policy
Returns
  • 30-Day Return Policy: Return requests must be submitted within 30 days of your delivery date. We cannot process returns after this period.
  • Return Requirements: Products must be unused, uninstalled, and in their original packaging (including box and pallet) to qualify.
  • Restocking Fee: A restocking fee may apply and varies by brand.
Full returns policy
Authorized MRCOOL Dealer
Full manufacturer warranty on every MRCOOL product we sell.

Customer Reviews

Based on 47 reviews
87%
(41)
11%
(5)
2%
(1)
0%
(0)
0%
(0)
J
Jim M. (Los Angeles, CA)
Easy to install and working great.

I needed to replace another unit that a previous contractor didn't do any part of that installation correctly, and the condensation line was leaking inside the house, running down the wall since that installation!! The indoor coil was 1-1/2" out of level, the line set wasn't wrapped, the electrical was tapped into the same circuit as the garage light and outlets...it was a mess.

It took me more time to demo the old unit out than to install the one I bought from you.

Thank you.

B
Bill (Philadelphia, PA)
Very pleased.

Very pleased with the price, delivery, ease of installation, and above all during this heatwave it is working excellently.

N
Natalie N. (San Jose, CA)
Perfect for our needs!

I ordered a 2 zone unit for the bedrooms in our home. It took a few months to arrive (manufacturer issue, nothing to do with HOD, and we were contacted on more than one occasion with an order update which was much appreciated!), but when it did arrive was very easy to install. Both the heat and AC function work perfectly, and our family is very happy!

R
Robert W. (Marietta, GA)
Decent Company

I ordered a HVAC system and it arrived in a timely manner and with no apparent issues. I thought the system was defective once installed but it was the installers fault who wired it wrong. My only issue would be the fee (30% I believe) to return a defective item within the 30 day return policy. If it is defective the customer shouldn't have to pay a fee to return an item that is not operating as designed. Other than that this is a good company.

P
Peter K. (Phoenix, AZ)
Pretty Easy Install and Works Great!

Installed my own central HP system. It was a bit of work but nothing beyond a person with basic mechanical and electrical skills. It took me a while because I had to remove the existing electric forced air furnace from a pretty tight place. Some custom sheet metal work and a bit of custom electrical too. Worked perfectly when powered up and I actually like the thermostat provided, although I wish it was clearer how to set up a temperature set-back schedule. Pre-charged refrigerant piping was something new and I liked that too. The best thing is that my electric utility forked out $4,000 and that paid for the unit!

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