MRCOOL Fake Downflow Product 1
Pro Install Signature Series

MRCOOL Fake Downflow Product 1

Whole-home heating & cooling through your ductwork

1.5 Ton 18,000 BTU Ideal Coverage: 600-900 sq ft Up to 14.3 SEER2

Model: SIG-SYS-63

Reliable central heat pump system for smaller spaces. Uses existing ductwork, delivers consistent heating and cooling, and offers simple, proven performance with professional installation.
$2,982 $2,714 Complete System Price
  • In stock — ships in 1–3 business days
  • Financing options available at checkout

As low as $226/mo with Affirm

  • Uses existing ductwork
  • Whole-home cooling
  • Reliable compressor system
  • Quiet indoor & outdoor
  • Works with smart thermostats

Quick Answers Before You Buy

Will this system work with my existing ductwork?
Yes. It is designed to connect to standard residential HVAC duct systems.
Does this system provide heating and cooling?
Yes — The heat pump model provides efficient heating and cooling year-round. No — The cool-only model provides efficient cooling year-round, but not heat.
Not sure which size you need?
Sq ft and home characteristics determine sizing. Use our System Size Guide for guidance.
✓ Secure checkout ✓ Fast, free nationwide delivery ✓ Expert support ✓ Factory warranty ✓ Financing options

Customize Your System

Recommended add-ons used in most central AC installations

Line Set

Recommended

Most installs require a refrigerant line set between units.

Thermostat

Recommended

Most systems need a thermostat to operate after installation.

Heat Kit

Recommended

Provides backup electric heat for cold snaps and extreme weather.

Choose the Right System Size

System SizeCoverage AreaView Systems
1.5 Ton up to 900 sq ft Current selection
2.0 Ton 800–1,200 sq ft See 2.0 Ton Systems
2.5 Ton 1,200–1,600 sq ft See 2.5 Ton Systems
3.0 Ton 1,500–1,800 sq ft See 3.0 Ton Systems
3.5 Ton 1,750–2,100 sq ft See 3.5 Ton Systems
4.0 Ton 2,000–2,400 sq ft See 4.0 Ton Systems
5.0 Ton 2,200–2,600 sq ft See 5.0 Ton Systems

Between sizes? Choose the larger system.

I don’t know what size I need — Help me!

Official MRCOOL Dealer

Free Delivery Ships in 1–3 Business Days

Expert System Sizing Guidance

Full Factory Warranty Support

Whole-Home Comfort Through Your Existing Ductwork.

Key Features

Premium Central Integration

Premium Central Integration

Designed for high-quality ducted HVAC systems. Integrates seamlessly into refined central installations.

Precision Whole Home Comfort

Precision Whole Home Comfort

Balanced comfort delivered throughout your home. Precision control maintains a consistently comfortable environment.

Ultra Quiet Performance

Ultra Quiet Performance

Engineered for exceptionally quiet operation indoors and out. Delivers premium comfort without interrupting daily life.

Will This System Work For Your Space?

BEST FOR Homes
600-900 sq ft
ELECTRICAL 208-230V
circuit required
INSTALLATION Professional Install
system
CLIMATE Standard Heat Pump

Still not sure? Try our System Finder

Learn More About This System

Detailed Specifications & Documentation

Reliable Whole-Home Comfort — Simple, Proven Performance

The MRCOOL® Signature Series 1.5 Ton (18,000 BTU) heat pump system delivers dependable
heating and cooling for smaller homes and spaces using traditional, field-proven HVAC technology.
Designed for use with existing ductwork, this system provides consistent comfort, quiet operation,
and straightforward installation by a licensed HVAC professional.

With efficiency ratings of up to 14.3 SEER2 and 11.7 EER2, the Signature Series offers a
cost-effective solution for homeowners who want reliable performance without the added
complexity of inverter-driven systems.

Is This System Right for Your Home?

Best ForSmaller homes, apartments, or spaces using existing ductwork

InstallationProfessional HVAC installation required

Performance RangeReliable heating from 5°F to 122°F cooling operation

System TypeStandard split-system heat pump (non-inverter)

Key Features That Matter

Consistent Heating & Cooling18,000 BTU capacity delivers reliable year-round comfort for smaller spaces.

Energy Efficient PerformanceUp to 14.3 SEER2 and 11.7 EER2 for dependable efficiency and controlled energy costs.

Built for DurabilityScroll compressor, reinforced cabinet, and corrosion-resistant components ensure long system life.

Quiet OperationEngineered for low noise levels with approximately 53 dB indoors and 60 dB outdoors.

Flexible InstallationMulti-position air handler supports upflow, downflow, or horizontal configurations.

Smart Thermostat ReadyCompatible with most standard and smart thermostats for modern control options.

Designed for Reliable Performance

The Signature Series uses a traditional single-stage heat pump design, providing steady heating
and cooling performance without the complexity of variable-speed inverter systems. This makes it
an excellent choice for homeowners prioritizing simplicity, serviceability, and long-term reliability.

The outdoor condenser includes a factory pre-charged R-454B refrigerant system and intelligent
defrost control to maintain performance during colder conditions. Inside, the air handler uses
a copper coil with aluminum fins for efficient heat transfer and consistent airflow throughout the home.

System Components
Outdoor CondenserPre-charged with R-454B refrigerant and equipped with a durable scroll compressor,
this unit delivers reliable outdoor performance with quiet operation and weather-resistant construction.
Indoor Air HandlerMulti-position air handler with efficient coil design allows flexible installation in closets, attics,
or utility spaces while maintaining strong airflow and quiet indoor comfort.

Key Technical Specifications
  • Cooling Capacity: 18,000 BTU
  • Heating Capacity: 18,000 BTU
  • Efficiency: Up to 14.3 SEER2 / 11.7 EER2
  • Voltage: 208/230V, 1 Phase, 60 Hz
  • Airflow: Approx. 1950 CFM
  • Sound Level (Indoor): ~53 dB
  • Sound Level (Outdoor): ~60 dB
  • Refrigerant: R-454B
  • Line Set: 3/8″ Liquid / 3/4″ Suction

What’s Included
  • Outdoor Condenser (Pre-Charged)
  • Indoor Air Handler (Multi-Position)
  • Installation Manual
  • Owner’s Manual

Warranty & Confidence

The MRCOOL® Signature Series is backed by a strong manufacturer warranty, including a
10-year parts limited warranty and lifetime compressor coverage, giving homeowners
long-term peace of mind.

A Practical, Proven HVAC Solution

If you’re looking for a straightforward, reliable central heating and cooling system,
the MRCOOL Signature Series is an excellent choice. It combines proven HVAC design,
solid efficiency, and flexible installation to deliver dependable comfort without unnecessary complexity.

  • Cooling Capacity18000 BTU
  • Heating CapabilityStandard Heat Pump
  • Coverage Area600-900 sq ft
  • Installation TypePro Install
  • Line Set TypeFlared Line Set
  • RefrigerantR-454B
  • SEER2 Rating14.3
  • SeriesSignature
  • System TypeCentral/Ducted
  • Voltage208-230V
  • Air Handler TypeCentral Ducted
  • Cold Climate EligibleFalse
  • Air Flow DirectionDownflow
Will this work with my home?
Yes — Signature Central systems provide heating and cooling throughout your entire home using existing or new ductwork. Proper sizing ensures consistent comfort across all rooms.
Do I need existing ductwork?
Yes — Signature systems distribute air through ductwork. A professional installer can evaluate, modify, or install ductwork if needed.
Who installs Signature systems?
Signature systems are installed by a licensed HVAC technician using traditional central HVAC installation methods to ensure optimal performance and reliability.
What makes Signature systems different?
Signature systems deliver reliable, whole-home comfort using traditional ducted HVAC design, making them ideal for homes with existing ductwork or new construction.
How loud is the system?
Very quiet. Equipment is typically installed outside living areas, and insulated ductwork helps keep indoor noise levels low.
What is included with the system?
Systems include the outdoor condenser and indoor air handling equipment. Installation materials and duct connections are supplied by your HVAC installer.
What warranty is included?
Warranty includes a 10-year parts warranty and limited lifetime compressor warranty. Warranty remains valid with professional installation.

Need Help From a MRCOOL Expert?

Not sure which system is right? Our HVAC specialists can help you choose the correct size and configuration.

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