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<p><b>Heating, ventilation, and air conditioning</b> (<b>HVAC</b> ) systems regulate <a href="page.php?w=temperature">temperature</a>, <a href="page.php?w=humidity">humidity</a>, and <a href="page.php?w=indoor_air_quality">indoor air quality</a> in vehicles and buildings. They are designed to provide <a href="page.php?w=thermal_comfort">thermal comfort</a> and to control airborne <a href="page.php?w=contaminant">contaminant</a>s through heating, cooling, ventilation, filtration, and humidity control. HVAC design considerations include energy efficiency,</p><p>
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