πŸ’Έ 3% Cash Back | Cash, Check, Wire or Zelle πŸ’Έ

SAVE 3%

  • (877) 770-3548
  • Synchrony Financing

C&H 18K-Btu 18.5 SEER2 Central-AHU Mini Split Heat Pump (-13Β°F) E-Star: 12.1 EER/9.8 HSPF (R454B)

Free Shipping
In Stock CH-RS18MAHU/CH-RES18-230VO

New R454B C&H Central Ducted Hyper Heat Pump AC System Included in Package: (1) One Indoor Air Handler (Thermostat Included) (1) One Hyper Heat Pump Outdoor Unit ( -13F /-13 F ) Factory Warranty : 7 Yr Compressor /5 Yr Parts Copper & Indoor to Outdoor Wire can be added via the dropdown boxes above Wire option above is communication from indoor to outdoor, you will need field supplied wires also. See Related Items Below For More Accessories INDOOR KEY FEATURES Installation Flexibility A built-in sec...

Your price

Buy more, pay less

from each
1 × =
Description

C&H 18K-Btu 18.5 SEER2 Central-AHU Mini Split Heat Pump (-13°F) E-Star: 12.1 EER2 / 9.8 HSPF2 (R454B)
Cooper & Hunter
C&H 18K Central Air Handler (AHU) Heat Pump (-13°F)
18.5 SEER2 9.8 HSPF2 -13°F Min Heat R454B Energy Star

C&H 18K-Btu 18.5 SEER2 Central-AHU Mini Split Heat Pump (-13°F) E-Star: 12.1 EER2 / 9.8 HSPF2 (R454B)

208/230V R454B Hyper Heat: -13°F β˜… Energy Star Certified Free Nationwide Shipping Factory Warranty

Cooper & Hunter's 18,000 BTU Central AHU delivers inverter-driven heat pump performance through your existing ductwork — achieving 18.5 SEER2, 12.1 EER2, and 9.8 HSPF2 with next-gen R454B refrigerant. Energy Star certified, with a -13°F minimum heating temperature that makes it a viable primary heat source in most U.S. climates.


Multi-position installation (horizontal or vertical), built-in anti-cold air protection, TU1 copper tubes, and a wired Wi-Fi thermostat are standard. Optional electric heat strips (5kW–20kW) can be added as a backup. If your home has existing central ductwork, this unit is the most cost-effective way to upgrade the entire system to inverter-driven heat pump efficiency.

Efficiency & Performance Stats

18.5SEER2 Cooling
12.1EER2 Rating
9.8HSPF2 Heating
-13°FMin Heat Temp
R454BRefrigerant
7yrCompressor Warranty
Technical Specifications
Model (Indoor / Outdoor) CH-RS18MAHU / CH-RES18-230VO
System Type Single-Zone Central AHU Heat Pump
Cooling Capacity 18,000 BTU/h (1.5 Ton)
Cooling Efficiency 18.5 SEER2
EER2 12.1
Heating Efficiency 9.8 HSPF2
Min. Heating Temperature -13°F / -25°C
Refrigerant R454B (A2L Low-GWP)
Voltage 208/230V / 60Hz / 1Ph
Installation Positions Horizontal, Vertical Upward, Vertical Downward
Wired Thermostat Included (Wi-Fi capable)
Auxiliary Heater Compatible — 5kW, 10kW, 15kW, 20kW (sold separately)
Energy Star Yes — Certified
Warranty 7-Year Compressor / 5-Year Parts

Key Features

Central Duct Drop-In Replacement

Replaces your existing 1.5-ton air handler and connects directly to existing supply/return ductwork — no new ducts, no demo.

Multi-Position Installation

Horizontal, vertical upward, or vertical downward. Built-in secondary drain pan for added moisture protection in all positions.

Anti-Cold Air Function

Fan stays off until the heating coil warms up, preventing cold drafts at system start — unlike traditional heat pumps.

Higher HSPF2 at 18K vs 24K

At 9.8 HSPF2, the 18K model delivers slightly better heating efficiency than the 24K. Right-sizing matters for both comfort and cost.

Auxiliary Heater Ready

Accepts optional electric heat strips (5kW–20kW, sold separately) for emergency backup heat in extreme cold events.

TU1 Copper Coils

High-purity copper (99.97%+) for superior heat transfer efficiency, corrosion resistance, and long service life.

Why Buy From Mini Split Warehouse?

🚚
Free Nationwide Shipping

No weight limits. No dimensional charges. Free freight delivery on every order.

🏭
Factory Warranty Included

Every unit ships with the full manufacturer warranty — no third-party coverage needed.

πŸ’°
Lowest Prices Online

We cut out the middleman. Compare us against any competitor — we back our pricing.

πŸ”€
20+ Brands Side By Side

Shop Pioneer, Daikin, Midea, MRCOOL, Cooper & Hunter, and more in one place.

πŸ“ž
Real Technical Support

Call or email our team. We answer specs, sizing, and installation questions — not scripts.

πŸ’΅
3% Cash Back Offer

Pay by check or bank transfer and get 3% back — one of the easiest savings available.

Mini Split Warehouse Trust Badges

🎯 Factory Warranty

7Year Compressor
5Year Parts

❓ Frequently Asked Questions

Is 18K BTU the right size for my home?

The 18K BTU (1.5-ton) AHU is typically suited for homes around 700–1,100 sq ft depending on insulation, ceiling height, and climate. If you're replacing an existing 1.5-ton system, this is a direct match. Our team can help confirm sizing — call or email before you order.

What's the difference between this 18K AHU and the 24K version?

Same construction, same features, different capacity. The 18K version actually achieves slightly higher HSPF2 (9.8 vs 9.0) due to right-sizing effects. Choose based on your existing duct system size and manual J load calculation.

Can I add an electric heat strip later?

Yes. The AHU is designed for optional heat strips (5kW, 10kW, 15kW, 20kW) that mount inside the unit. Sold separately. Useful for providing backup resistance heat on very cold days below the -13°F operating floor.

Does this work with my existing thermostat?

The unit ships with a wired 120N thermostat with Wi-Fi for C&H app control. It also accepts most standard 24V wired thermostats (Honeywell, Ecobee, etc.) — connect to the R, C, Y, G, W terminals as normal.

Is professional installation required?

Yes for refrigerant line connection — EPA Section 608 certification is required to handle R454B. The duct connection and electrical can be handled by a skilled HVAC tech or licensed contractor. We have a vetted installer network and can provide referrals.

Specification
Title C&H 18K-Btu 18.5 SEER2 Central-AHU Mini Split Heat Pump (-13Β°F) E-Star: 12.1 EER/9.8 HSPF (R454B)
Brand Cooper and Hunter
Category 18000 Btu | 1.5 Ton | 600-800 Sq Ft
SKU CH-RS18MAHU/CH-RES18-230VO
Condition new
UPC 810035931107
MPN CH-RS18MAHU
Reviews 3
5.0 3 reviews

Great company

Dena · October 2024

Just installed our Cooper & Hunter split. It's perfect! I purchased the accessories that were suggested and that was everything we needed. It's unbelievably quiet. It arrived quickly.I unconditionally recommend Mini Split Warehouse.

Got 10 of them, replaced central units

Garrett Walsh · August 2024

I replaced 10 central units in my rentals with these, all the tenants are reporting 30-50% lower energy bills!!

Awesome unit!

Garner · November 2024

Everything included, easy setup, quality product! Finally my 3 seasons room is useable. I would buy this product again

Customer Reviews

5.0 / 5 · 3 reviews
Great company

Just installed our Cooper & Hunter split. It's perfect! I purchased the accessories that were suggested and that was everything we needed. It's unbelievably quiet. It arrived quickly.I unconditionally recommend Mini Split Warehouse.

Dena · 2024-10-11
Got 10 of them, replaced central units

I replaced 10 central units in my rentals with these, all the tenants are reporting 30-50% lower energy bills!!

Garrett Walsh · 2024-08-14
Awesome unit!

Everything included, easy setup, quality product! Finally my 3 seasons room is useable. I would buy this product again

Garner · 2024-11-12

Mini Split Warehouse offers a wide selection of ductless air conditioners and split heat pumps, providing free shipping nationwide.

(877) 770-3548

Raffle Sign-Up

Sign up today for special offers, coupon codes and our free raffle.Β