MRCOOL® Signature Series 42k Multi-Position Air Handler
The MRCOOL® Signature Series 42k Multi-Position Air Handler is built to provide consistent, energy-efficient comfort in any climate. Designed for flexibility and performance, this unit works with R-454B refrigerant, a low-GWP alternative that helps reduce environmental impact without sacrificing power or reliability.
Built for Flexibility
Its multi-position design allows for installation in upflow, downflow, or horizontal configurations, making it ideal for a variety of home layouts, from new construction to tight retrofits. With its slim, space-saving profile, it fits easily into closets, attics, or crawl spaces while still delivering full-capacity heating and cooling when paired with a compatible condenser or heat pump.
Long-Term Durability
Engineered for durability, the air handler includes a galvanized steel cabinet, a high-efficiency ECM blower motor, and copper “A” coils with enhanced aluminum fins for superior heat transfer and humidity control. Thermal insulation inside the cabinet reduces energy loss and prevents condensation, contributing to quiet operation and lower energy bills. Installation is fast and simple, helping to minimize labor time and disruption.
User-Friendly Design
An air filter rack allows for easy maintenance, while an optional electric heat kit is available for added heating performance in colder regions. Smart home compatibility comes standard, with support for most third-party thermostats so you can manage comfort on your terms—no proprietary systems required.
Warranty
Protected by a 10-year limited parts warranty, the MRCOOL® Signature Series 42k Multi-Position Air Handler offers long-lasting performance, space-saving design, and year-round efficiency for today’s comfort-conscious homeowner.
- Capacity: 42k (≈3.5 ton)
- Refrigerant: R-454B (low-GWP, eco-friendly)
- Configuration: Multi-position (upflow, downflow, horizontal)
- Design: Slim, space-saving profile for attics, closets, or crawlspaces
- Cabinet: Durable galvanized steel construction
- Blower Motor: High-efficiency ECM
- Coil: Copper “A” coils with enhanced aluminum fins for superior heat transfer & humidity control
- Insulation: Internal thermal insulation reduces energy loss, condensation & noise
- Filter: Built-in filter rack for easy maintenance
- Heat Option: Optional electric heat kit for colder climates
- Thermostat Compatibility: Works with most third-party thermostats (smart home ready)
- Warranty: 10-year limited parts warranty
Specifications
| Appearance | |
|---|---|
| Color | Gray |
| Appliance Category | Air Conditioner |
| Brands | |
|---|---|
| Brand | MRCOOL |
| Series | Signature |
| Dimensions | |
|---|---|
| Height | 45 3/4" |
| Width | 19 3/5" |
| Depth | 22" |
| Style | |
|---|---|
| Style | Air Handler |
| Type | Mini Split Indoor Unit |
| Capacity | |
|---|---|
| Nominal BTU Capacity | 42000 BTU |
| Cooling BTU Capacity | 42000 |
| Heating BTU Capacity | 42000 |
| Warranty | |
|---|---|
| Warranty | 10 Year Parts |
| Technical Details | |
|---|---|
| Voltage | 230 Volts |
| Amps | 15 |
| Features | |
|---|---|
| Filter Type | Removable |
| Provides Heating | Yes |
| Heat | Heat Pump |
| Remote Controller | No |
| Corrosion Protection | Yes |
| Others | |
|---|---|
| Color Family | Gray |