A Rooftop Unit (RTU) brings in outside air, conditions it (heats or cools), and distributes it via ductwork into the building. It houses all major components—compressor, evaporator, condenser, fans, and filters—in one weatherproof box.

Correct sizing requires a manual load calculation, taking into account:

• Square footage

• Occupancy

• Building orientation & insulation

• Ventilation needs

This ensures energy efficiency and balanced indoor comfort.

ETS installs and services:

• ETS installs and services several types of RTUs, including gas and electric units, heat pump RTUs, and high-efficiency or variable-speed RTUs with integrated economizers or advanced control packages.

Yes. Most RTUs support protocols like BACnet, Modbus, or Prolon, allowing seamless integration with smart systems for remote control, zoning, and performance monitoring.

Look for:

• Uneven temperatures

• Spiking utility bills

• Excessive noise or vibration

• Frequent service calls

• Age over 15 years

Installation costs range from $5,000 to $20,000+, depending on:

• Tonnage

• Crane/lift access

• Curb adapter needs

• Controls and customization

A curb adapter allows a new RTU to fit the existing rooftop curb and ductwork. It avoids re-roofing and major duct modifications during upgrades.

Yes. RTUs are built for outdoor operation but benefit from optional protections like hail guards, coil covers, and snow diverters to extend their life.

An RTU (Rooftop Unit) is a self-contained HVAC system installed on a roof that includes heating, cooling, and air handling in a single cabinet. An AHU (Air Handling Unit), by contrast, is typically installed indoors and only handles air movement—it requires connection to separate heating and cooling equipment, such as chillers or boilers.

Key differences between RTUs and AHUs:

• Location: RTUs are rooftop-mounted; AHUs are usually in mechanical rooms or basements.

• Functionality: RTUs are all-in-one; AHUs are part of a split or central plant system.

• Application: RTUs are common in standalone commercial buildings; AHUs are often used in larger facilities or complex systems like hospitals or campuses.

• Maintenance: RTUs offer simpler service access and faster installation; AHUs allow greater customization and scalability.

Both systems move air, but RTUs are turnkey packages, while AHUs are components of a more extensive HVAC setup.

Rooftop units should be professionally serviced at least twice a year—typically in the spring and fall—to ensure reliable performance through seasonal temperature changes. Regular service includes filter replacements, coil cleaning, belt inspections, and system checks to prevent costly breakdowns.

Preventive maintenance involves scheduled inspections, cleanings, and component checks to keep your RTU running efficiently. Common tasks include verifying airflow, checking refrigerant charge, cleaning coils, inspecting electrical components, and calibrating controls. Routine maintenance can extend equipment life and lower energy costs.

Neglecting routine maintenance can lead to reduced energy efficiency, uneven temperatures, poor indoor air quality, and unexpected equipment failures. Over time, minor issues can become major repairs, increasing operating costs and shortening the unit’s lifespan.

Yes. Many RTUs can be upgraded with energy-saving enhancements like economizers, VFDs, or advanced controls. Upgrading can improve performance and extend the life of the equipment, often at a lower cost than full replacement.

You can request a quote by calling us or submitting our online form. We’ll schedule a site visit, evaluate your system or project, and deliver a detailed proposal with equipment options, pricing, and timelines.