Tranquility® (ST) Rooftop Series
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The Tranquility® (ST) Rooftop Series from ClimateMaster delivers outstanding efficiency and quiet operation, making it ideal for modern HVAC applications. With sizes ranging from 3 to 20 tons and featuring eco-friendly refrigerant, these units meet and exceed ASHRAE 90.1 standards while ensuring minimal noise and enhanced control options.
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- Features
- Specs
- Resources
Overview

Features
Standard Features
- Sizes 036 (3 ton, 10.55 kW) through 240 (20 ton, 70.34 kW)
- Exceeds ASHRAE 90.1 efficiency standards
- Backward-inclined EC Plenum Supply Fans
- Environmentally-friendly R-454B low-GWP refrigerant
- Refrigerant Detection System (RDS) (mandatory on sizes 048 through 240, optional for size 036)
- Dual refrigeration circuits (sizes 096 and larger)
- Galvanized-steel cabinet construction with polyester powder-coat paint
- Double-wall construction for access doors with stainless-steel hardware
Configurable Options
- BACnet, Modbus and Johnson N2 compatibility options for Building Management Systems (BMS)
- Demand-controlled ventilation (DCV) with optional enthalpy economizer and optional CO2 sensor
- Two-way motorized water valves that prevent water flow through the unit when it is not in operation, increasing system pumping efficiency
- Internally-mounted water pump for single-pipe systems
Performance Specifications
Resources
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“We have geothermal—our neighbors don’t, and I know they wish they did. It’s a clean heat, not as drying to the skin, and you can feel the difference. In 6.3 years, we’ll recoup our investment, and after that, it’s all savings. Just plain facts—it saves money. ClimateMaster was the right choice: professional, customer-oriented, and easy to work with.”