COCOON THRMS-1-3900 Thermal Mass Furnace

The COCOON THRMS-1-3900 Thermal Mass Furnace is our flagship Thermal Mass Furnace, engineered to deliver the highest level of heating performance for the most demanding residential, commercial, and specialty applications. Combining Thermal Mass Technology, intelligent controls, and a variable-speed blower motor, it provides consistent, energy-efficient heating with exceptional comfort, reliability, and long-term performance.

Unlike conventional electric furnaces that simply cycle on and off, the COCOON Thermal Mass Furnace stores and manages thermal energy to help maintain more stable indoor temperatures while improving overall system efficiency. Multi-stage heating and customizable control algorithms automatically adapt to changing heating demands, delivering dependable comfort in the most challenging environments.

Built for today's evolving energy landscape, the THRMS-1-3900 is compatible with utility power, solar, wind, hydroelectric systems, backup generators, and hybrid energy solutions. Its modular design helps simplify installation, reduce labor time, and make future upgrades easier, making it the ultimate heating solution for customers seeking uncompromising performance and long-term flexibility.

Key Benefits

• Delivers consistent, energy-efficient whole-home comfort
• Thermal Mass Technology helps maintain more stable indoor temperatures
• Variable-speed, multi-stage heating adapts to changing comfort needs
• Modular design reduces installation time and simplifies future upgrades
• Compatible with utility power, solar, wind, hydroelectric, generator, and hybrid energy systems
• Intelligent controls optimize system performance for greater efficiency
• Integrates into existing ductwork with minimal system modification
• Suitable for residential, commercial, and specialty HVAC applications
• Engineered and manufactured in the United States

General Specifications

THRMS-1-3900-S/R-P12

Energy Source: Electric Grid, Solar, Wind, Hydro, Backup Generator, or Hybrid Energy Systems

Venting Required: None

Emissions: None

BTU Capacity: 183,222 BTUs

Active BTU: 110,553.4 BTUs

Stored BTU: 72,668.6 BTUs

Active KW: 32.4

Number of Circuits: 3

Number of Circuit Breakers: 3

Voltage: 208-240V / 480V

Hertz: 50 / 60

Full Load Amps: 45 each

Maximum Overcurrent Protection: 60 Amps each

Minimum Circuit Ampacity: Per NEC and local codes

Circuit Ampacity: 58 Amps

Recommended Breaker: 60 Amps

Installation Orientation: Vertical, Horizontal, Downflow

Maximum Air Flow: 2000 CFM (Customizable)

Electrical Phase: Single Phase standard (Three Phase available, contact for availability)

Unit Dimensions: 18 x 24 x 72 in

Product Weight: 250 lbs

Shipping Weight: 270 lbs

Safety Listing: UL Listed File Number SA44706

Warranty Information

• 1-Year, 5-Year, and 10-Year Limited Warranty Options
• 10-Year Heat Exchanger Warranty
• See Warranty Documentation for Complete Details

Shipping Information

Shipping Method:
LTL Freight (Where Available)

Shipping Weight:
270 lbs

Country of Origin:
United States

Application Assistance

If you have questions regarding sizing, electrical requirements, installation configuration, or application suitability, our team is available to help determine the best COCOON solution for your project. Call us at +1 314-931-1004