There are several manufacturers of **Packaged Units** (also known as **Rooftop Units** or **RTUs**) which are widely used for commercial HVAC applications. These units typically include all the components needed for heating, ventilation, and air conditioning in one compact unit. Below are some of the major manufacturers of packaged units/RTUs:

### 1. **Trane**
– **Website**: [www.trane.com](https://www.trane.com)
– Trane offers a wide range of rooftop units known for energy efficiency and durability. Their RTUs include both gas/electric and electric/electric models with varying capacities.

### 2. **Carrier**
– **Website**: [www.carrier.com](https://www.carrier.com)
– Carrier is one of the leading manufacturers of HVAC systems, including packaged rooftop units. They offer models that range in size and capacity, designed for both small and large commercial buildings.

### 3. **Lennox**
– **Website**: [www.lennoxcommercial.com](https://www.lennoxcommercial.com)
– Lennox offers high-efficiency packaged units, with options for both heating and cooling. Their RTUs are known for their energy-saving features and innovative technology.

### 4. **Rheem**
– **Website**: [www.rheem.com](https://www.rheem.com)
– Rheem manufactures a variety of HVAC products, including packaged rooftop units. They focus on energy-efficient models that can be customized with various options like economizers and enhanced filtration.

### 5. **York (Johnson Controls)**
– **Website**: [www.york.com](https://www.york.com)
– York, a division of Johnson Controls, provides packaged rooftop units designed for commercial applications. They offer a range of models including high-efficiency options, with flexibility in capacity and configurations.

### 6. **Mitsubishi Electric**
– **Website**: [www.mitsubishicomfort.com](https://www.mitsubishicomfort.com)
– Mitsubishi offers rooftop systems, particularly in the form of Variable Refrigerant Flow (VRF) systems, which combine the benefits of RTUs with advanced control systems and efficiency features.

### 7. **Daikin**
– **Website**: [www.daikin.com](https://www.daikin.com)
– Daikin is a global leader in HVAC and offers energy-efficient rooftop units for commercial buildings. Their products include heat pumps, cooling-only, and gas/electric models with smart controls for optimizing energy use.

### 8. **Goodman**
– **Website**: [www.goodmanmfg.com](https://www.goodmanmfg.com)
– Goodman offers a variety of rooftop units for commercial settings, including gas heating and electric cooling systems. They are known for offering reliable and cost-effective solutions.

### 9. **American Standard**
– **Website**: [www.americanstandardair.com](https://www.americanstandardair.com)
– American Standard offers a range of commercial rooftop units, including energy-efficient models that are suited for a variety of building types.

### 10. **Bryant**
– **Website**: [www.bryant.com](https://www.bryant.com)
– Bryant, a part of Carrier, offers packaged rooftop units designed to handle heating, cooling, and ventilation for large commercial applications. Known for reliability and energy efficiency.

### 11. **Bosch Thermotechnology**
– **Website**: [www.bosch-thermotechnology.com](https://www.bosch-thermotechnology.com)
– Bosch offers packaged units that combine heating and cooling in one system. These units are known for their quiet operation, energy efficiency, and advanced technology.

### 12. **McQuay (part of Daikin)**
– **Website**: [www.daikinapplied.com](https://www.daikinapplied.com)
– McQuay is a brand under Daikin that offers highly customizable rooftop units. They provide solutions for a wide range of commercial applications.

### 13. **Maytag (now part of Whirlpool)**
– **Website**: [www.maytagcommercialhvac.com](https://www.maytagcommercialhvac.com)
– Maytag’s rooftop units are known for their durability and efficiency, offering a variety of models with both cooling and heating capabilities.

### 14. **Ruud**
– **Website**: [www.ruud.com](https://www.ruud.com)
– Ruud manufactures a variety of HVAC systems, including rooftop units. They offer energy-efficient and customizable solutions for commercial and light industrial applications.

### 15. **ThermaStor (Part of ClimateMaster)**
– **Website**: [www.thermastor.com](https://www.thermastor.com)
– ThermaStor offers solutions for commercial heating and cooling applications, specializing in energy-efficient packaged systems.

### Additional Resources:
– **Local HVAC distributors** often carry several of these brands and can provide additional options, including more regional or niche manufacturers.
– **HVAC wholesalers** like **Ferguson**, **Watsco**, or **Johnstone Supply** can also offer various packaged units for commercial needs.

If you’re interested in specific models or need more details about features like energy efficiency, sizing, or installation, I can help with that too.