HVAC Journeyman Practice Exam 2025 - Free HVAC Practice Questions and Study Guide

Setting an evaporative cooler on a level concrete slab is the recommended isolation method because it provides a stable, durable, and level surface that effectively supports the unit. A concrete slab minimizes vibrations and helps to prevent any structural issues that could arise from settling or shifting over time. Moreover, a level surface ensures that the evaporative cooler operates efficiently by maintaining proper water flow and drainage. It also protects the equipment from moisture issues that could be introduced from the ground, enhancing the longevity of the cooler.

In contrast, other methods may not provide the same level of stability or effectiveness. For instance, a trench might create uneven surface conditions or lead to potential issues with water accumulation. A concrete patio, while stable, may not be designed specifically for equipment support and may introduce additional costs or complexity. Securing the evaporative cooler to a wooden platform may not provide the necessary stability or durability required over the long term when exposed to weather conditions and mechanical vibrations.