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To optimize the selection of efficient, cost-effective mechanical and ventilation systems, perform an energy analysis early in the process, during the schematic design phase. With the high levels of fresh air required for building ventilation, removing moisture has become increasingly important. Air admittance valves, an inexpensive and code-approved one-way air valve, can be added to sewer vents to eliminate the potential for release of gases into the surrounding air. If you were to call once in the spring and once in the fall for checkup, you would get the same benefit, but it would likely cost more for you to pay the regular hourly rate hvac systems work for service than if you performed planned maintenance.