RTU Optimizers: HVAC Energy Efficiency Study
Advanced Rooftop Control (ARC) Retrofit: Field-Test Results
Packaged cooling equipment also known as Rooftop Units (RTUs) are used in 46% of all commercial buildings, and serves approximately 69% of the commercial building cooled floor space in the U.S. The ubiquitous use of these pieces of equipment is due to the ease by which they can be designed into a building, low capital cost, and a modular nature that allows for easy demarcation of energy billing and maintenance responsibility between multiple tenants of a single building. However, RTUs are notoriously inefficient because they’re often oversized, improperly installed, and inadequately maintained. In addition, even though the technology for improving RTU energy efficiency is well understood, the forces driving design tend to favor low first costs and ease of installation rather than energy efficiency and robust design.