This category contains sites that discuss the technical aspects of HVAC (heating, ventilation and air conditioning systems) as they are applied to residential and commercial climate control.

Sites that contain theory, information tables or other technical aspects of HVAC systems or components may be included here.

If your site contains technical information about heating, ventilating and air conditioning, submit here.

If your site is only about sales, parts, or installing HVAC systems or units, submit your site to Business: Construction and Maintenance: Commercial Contractors: Mechanical: Heating and Air Conditioning. This category is not a business category.