Signature 18,000 BTU Split System Air Handler Multi-Position

The MRCOOL® Signature Series 18k Multi-Position Air Handler delivers dependable, year-round climate control with enhanced energy efficiency thanks to its use of R-454B refrigerant, an eco-friendly upgrade that reduces environmental impact without sacrificing performance. Built for flexibility, this unit supports upflow, downflow, and horizontal configurations, making it an excellent choice for compact installations such as closets, attics, and crawl spaces.

Despite its slim profile, this Signature Series Air Handler provides robust heating and cooling when matched with a compatible heat pump or condenser. Its tough galvanized steel cabinet resists wear and corrosion, ensuring long-term durability.

Inside, copper “A” coils with high-efficiency aluminum fins maximize heat transfer and moisture removal, while internal thermal insulation minimizes energy waste and condensation, keeping comfort high and utility bills low.

Installation is streamlined with its user-friendly design, saving time and reducing labor costs. A built-in air filter rack allows for quick filter replacements, and an optional electric heat kit is available for enhanced performance in colder regions.

Smart home ready, this unit works with most third-party thermostats, giving homeowners the freedom to customize their comfort without relying on proprietary controls.

Covered by a 10-year limited parts warranty, the MRCOOL® Signature Series 18k Multi-Position Air Handler combines strength, efficiency, and adaptability delivering powerful, reliable comfort all year long.

We process orders within 1-2 business days. Once your order has shipped, you will receive a confirmation email with tracking information.

Estimated Delivery Times
Standard Shipping: 3-7 business days
Expedited Shipping: 2-3 business day
Express Shipping: 1-2 business days
Delivery times may vary during holidays, promotions, or due to carrier delays.

Order Tracking

Once your order ships, you will receive a tracking number via email. Please allow up to 24 hours for tracking information to update.

We want you to love your purchase. If you're not completely satisfied, you may return eligible items within 30 days of delivery.

Return Requirements

Items must be:
Unused and in original condition

Returned with original packaging
Accompanied by proof of purchase
Non-Returnable Items

The following items cannot be returned:

Gift cards
Final sale items
Personalized or custom-made products
Digital products and downloads