HVAC system components, parts, and accessories, namely, fans for HVAC units, air purifiers; air filters for air conditioning units, air filters for air purifiers; air ventilators in the nature of energy and heat recovery ventilators; ventilating exhaust fans; humidifiers; dehumidifiers

Air conditioners and air and water heaters; air conditioning and heating systems, namely, refrigeration chillers and commercial and industrial air conditioners, ventilators and heating units; geothermal-based HVAC units

air conditioners and air and water heaters; air conditioning and heating systems, namely refrigeration chillers and commercial and industrial air conditioners, ventilators and heating units